wind turbine sailboat

Sailboat Wind Generators: The Ultimate Guide 2024

Sailboat wind generators are a way to capture the energy of the wind and use it to charge your batteries and power electronics aboard your vessel.

A large part of the appeal of living on a sailboat, for many people, is being more or less self-sufficient – using the wind for propulsion, and the elements to generate all the power you need.

Solar panels are a wonderful technology, literally magic, but the sun doesn’t shine every day. In fact, of the most popular cruising grounds in the world aren’t even that sunny. It rains three to four days a week in Barbados or Antigua, for example (don’t even get us started on the English Channel).

And what about night sailing – keeping critical loads like autopilots and instruments online after the sun goes down?

A marine wind generator fills in those vital gaps in the energy picture, and eliminates the need to generate or run the engines to keep your electronics online.

In this expert guide we take a deep dive into sailboat wind generators, covering everything you need to know – from how they work through to the very latest technological advances.

With thousands and thousands of miles under the keel, we have lived off-grid using technologies just like this for almost a decade now. We’ve rewired more boats than anyone should ever have to. We’re marine electronics nerds, basically, and specifically very passionate about renewables like wind and solar.

That’s why we couldn’t wait to write about this topic, and why you’ve got a good 4000 words on it! Sorry about that! But feel free to skip and just read the information you’re interested in, we don’t blame you!

So, let’s take a close look at sailboat wind generators, how they work, what makes a good one, the best sailboat wind generators that we think deserve a place on your next nautical expedition.

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Table of Contents

The best sailboat wind generators – best budget choice, the best sailboat wind generators – best overall, what is a sailboat wind generator, why install a wind generator on a sailboat, wind generators vs solar power.

• What is a dump load on a marine wind generator ?
• Marine wind generators vs hydro generators

Our top budget choice: Nature Power 500

If you are in the US, the choice for the best budget marine wind generator is easy – it’s this guy , the Nature Power 500, which West Marine have sold for donkey’s years with eternally solid reviews.

It’s a 500-watt turbine that is natively compatible with both 12V and 24VDC systems. It’s made from marine-grade aluminium that’s also coated in a thick, durable coating to help it withstand years at sea.

This wind generator is rated for winds up to 110mph – well into hurricane territory – and it comes as a complete kit including a charge controller using the latest MPPT technology. The controller even has an electronic brake, even though it’s a manual one.

Honestly, this is just a lot of value for the ~$700 they’re asking, and very easy to recommend for the best budget sailboat wind generator.

We don’t massively recommend most of the budget options on Amazon for extended cruising – they’re just not built for the task. But if it’s all your budget will stretch to, something like a Pikasola 400 would be the best bet for a sailboat wind generator under $500.

Readers in the UK or Europe could look at something like a Rutl and 914i . You’ll pay a little more, around £850, but a Rutland is a proper piece of kit – they’re been manufacturing marine wind generators since the 1970’s, long before solar panels were even seen on pleasure yachts.

The 914i will produce about 260 watts in 30 knots of breeze, or 20+ amps into a 12-volt battery. In a hurricane it’ll make over 400 watts.

This is a genuine marine wind turbine built from quality parts and specifically designed for the aggressive saltwater environment. It comes with very few compromises, from the bundled MPPT tracker to its extremely quiet operation.

The charge controller supports a small solar panel as well, which is sort of nice – but we’d highly recommend using a top-quality, stand-alone MPPT charge controller for any solar panels if you can possibly afford it.   

If you are in Europe, or can import, we think the Silentwind Pro is probably the best sailboat wind generator you can buy right now. This is with the caveat that while we’ve seen these installed on lots of different yachts, talked to multiple long-term owners, and even handled one out of the box, we’ve never actually owned one.

That’s because they start at about €2,100, which is a considerable sum for a 420w wind generator. But what you do get is an incredibly refined package – one that picks up and starts generating with as little as four knots of breeze, and remains whisper-quiet right up into the high RPMs.

The Silentwind Pro uses hand-laminated carbon blades that are rated to withstand hurricane-speed winds, but that are also highly efficient across the curve. This is definitely one of the most engineered solutions on the market today.

The polished package is rounded out by features like an automatic electronic brake that kicks in if the wind exceeds a certain speed. Cheaper options may have an electronic brake but it generally has to be tripped manually by the crew.

Models without an electronic brake of any kind are frankly dangerous, because you have to lasso them to stop them – which is how the gentleman broke his arm, and wind generator, in the earlier example.

Other than Silent Wind, there are a few slightly cheaper options that are still very good. For readers in the US, one option made locally is the Air Silent X made by Primus Wind Power. We don’t have as much experience with these, but we have met a couple of happy owners and have heard similar things to Silentwind.

Primus claim they have the bestselling wind turbines anywhere in the world; we’re not sure about that given that Marlec / Rutland have been around nearly two decades longer, but either way their site states they’ve sold more than 150,000 wind generators since ’95, into over a hundred countries.

Primus make six different models at different price points that are all potentially worthy of consideration, but the Air X Silent or Air Breeze are both solid choices.

Rutland wind generators also remain easy to recommend across the board, particularly to readers in the UK and Europe, and a premium option would be something like a Rutland 1200 .

At around £1,500, or $1900, the Rutland 1200 can produce up to 480W flat out, and will hit 300W in only 20 knots or so of breeze. It’s a proper marinized unit built to withstand the rigours of life at sea, and that should provide years of low-maintenance service.

A sailboat wind generator, also known as a marine wind turbine or wind charger, is a device for capturing wind energy and turning it into electricity.

Sailboat wind generators typically have 3 or more long, aerodynamic rotor blades attached to a central hub. The blades translate wind energy into rotational force and spin the hub, sometimes at near-supersonic speeds .

The hub is attached to an electrical generator – a lot like the alternator on an engine – that generates electricity as it spins.

A wind turbine is an electrical fan operating in reverse. The fan takes electricity and uses it to spin a motor, attached to a hub and some blades, creating wind.

A wind turbine takes wind energy and uses it to spin a hub attached to generator, creating electricity.

You can actually just spin any DC motor to generate electricity , but it helps a lot if you pick one that generates the flavour of electricity you’re after.

Brushed motors are appropriate for generating DC, whereas a brushless motor is better suited to AC voltage applications.

A handful of marine wind turbines, mostly older ones, do use a brushed motor set up to produce a voltage that can directly charge a 12 volt or 24-volt battery.

Brushed motors are called that because they literally have a core of metal brushes that drags along inside outer, magnetic stator. Those brushes wear out over time and need to be replaced. They’re in something like a starter motor that works intermittently, but putting them in wind generators was always a bad idea.

They’re also noisy – which is a major consideration in a device that is going to run overnight, above your head, while you sleep, every night.

Brushless motors have so many advantages over brushed, from their efficiency to their lifespan to their reduced mechanical noise. As such, most wind generators produce AC electricity and then rectify it to DC at the regulator in order to charge the battery bank.

This means you will normally have three wires leading from the wind generator on your sailboat to the charge controller. It also means you definitely don’t want to connect those wires, carrying AC electric, to your DC battery bank, without passing them through the charge controller first.

Wind generators offer a lot of advantages – notably the ability to work day and night, and in both sunny and stormy weather.

Solar panels are great, but they only work during the day – and on sunny days, at that. They’re also affected a lot by the seasons, because in winter there are both less hours of daylight, and the sun is lower in the sky, its rays have to travel further and they strike the panel at an oblique angle. And, it’s cloudy or rainy nearly every day.

Regardless of season, as we’ve explored earlier in this guide, some of the most popular sailing destinations don’t actually have reliable sunshine – but all of them have reliable wind.

Not so with sailboat wind turbines, which work just as well on sunny days as stormy. They often generate even more power in winter, on days when solar might be producing at 10% or less.

This effect makes wind generators a big enabling technology for grey-weather sailing, from extending your sailing on into the “shoulder season” and benefitting from empty bays and anchorages, to exploring unconventional cruising grounds such as the Scandinavian fjords.

Besides stormy and overcast days, wind generators will keep on producing at night. This is particularly helpful when night sailing with the radar, AIS and full nav suite running, maybe plus an autopilot, and then all your domestic loads like your fridge and freezer. Even if you’re just at anchor, it’s nice to wake up with topped-off batteries every morning.

This doesn’t apply if you have a modern boat with ample battery storage, but when we were just getting started in sailing, we would frequently have half-flat batteries by morning.

Not only does this shorten the life of the bank, it occasionally even meant we struggled to pick up the hook in the morning – which is a bit of a safety hazard. Again, this is mitigated by wind.

None of this is to say that you should ditch solar power for wind. Solar power has many wonderful properties, explored below, and the two technologies actually complement each other very well. If you have a large enough vessel, we fully recommend you try to integrate both into your power plan.

Wind and solar are both very useful technologies to the cruising sailor, each with its own set of advantages and disadvantages. Their pros and cons in fact offset each other and synergise quite nicely, compensating for each other’s weaknesses.

As such, we’d argue it’s less about deciding which is better, and more about figuring out whether you can incorporate both into your power plan somehow.

Nonetheless, let’s have a look at how solar power and wind generators compare and contrast, and some of the pros and cons of each technology.

Advantages of solar power vs wind power

Solar power’s major advantage over wind is that it’s “solid state”. This means it has no moving parts to wear out, and requires almost no maintenance.

In fact, solar panels will generally sit and faithfully do their thing decade after decade with almost zero human interaction. A common standard nowadays is for panels to retain 90% of their producing power after 20 years .  

There’s a 10kW solar array in Switzerland that’s been feeding directly into the grid since 1982; it’s over 40 years old and going strong.

Solar panels benefit from wiping down once or twice a year, but other than that, they’re a totally set-and-forget technology.

Many sailing destinations have ample sunshine, with long hours of direct sun throughout the sailing season.

Solar is also cheap and plentiful nowadays, and panels come in all shapes and sizes that can fit almost anywhere on a yacht – including a handful of solar panels you can walk on, although those are not cheap.

Overall, though, solar is much cheaper than wind watt-for-watt. You might pay $0.50 per watt for a good rigid polycrystalline solar panel and charge controller. A wind generator may well run to $2000 for 400w – that’s $5 per watt, up to ten times more expensive. And the wind generator has moving parts that can require replacement.

Another often overlooked advantage of solar panels is that their solid-state nature makes them very safe – there are no moving parts to catch a finger in, or spinning blades that could strike a member of the crew. They just sit and silently do their thing, year after year.

Disadvantages of solar power vs wind power

Solar only works when the sun shines. The sun, as we’ve pointed out earlier, doesn’t always shine. You might be surprised by how cloudy places like the Caribbean can be – some islands have rain up to 50% of the time.

Some popular sailing destinations, like the English Channel, average about two hours of sunshine per day, with rain or overcast skies on 75% of days annually ( no, seriously ).

There’s always night sailing, as well. If you’re night-sailing, you may well have tools like radar and AIS running for safety, plus other loads like an autopilot and anything like fridges and freezers running below.

If you only have solar power, and no wind, you may have to run the engine to make it through the night – or invest in a large battery bank that can keep up until morning.

Marine wind generators are an excellent way to bridge the gap. It can be windy at any time of the day or night, and very often the cloudy or stormy days are the windiest. It’s only sunny during the day, and only some days, so this is a major disadvantage of solar power when compared to wind.

Another disadvantage of solar panels is that they lose power quite dramatically when shaded, and sailboats unfortunately have a lot of tall, shade-casting objects. These include the mast, the boom, the sails and anything like radar or Starlink dishes .

Somewhat paradoxically, solar panels also lose power as they get hot in the sun, meaning the normal, everyday conditions in many exotic destinations can actually reduce their efficiency by double-digit percentages. They are happiest somewhere cold with lots of sun, like on top of a mountain – not in the tropics.

Advantages of wind power over solar power

The wind doesn’t rise and set like the sun – it can blow around the clock. Okay, technically, the sun rising and setting down does change the temperature and create all the wind on earth.

But the wind often continues after the sun goes down. In fact, when you’re on a boat, on the water next to land, the wind usually just reverses at night .  

It’s often windy on the water on sunny days because all wind is caused by pressure flowing from high to low, and the main source of those differing areas of pressure is heat from the sun – particularly, say, where the adjacent land and water heat up at different rates.

That’s how wind is made on sunny days. But it’s often windy on non-sunny days, too, because it’s just about air rushing between those areas of high and low pressure, hot and cold air. As such, cold fronts can bring wind too.

This makes wind somewhat more of an always-on technology than solar – especially in the places that sailing boats are found. There is usually wind offshore, and often in the anchorages too as it rolls off the hills . In some parts of the world, such as those affected by the Greek Meltemi , it blows straight 30’s weeks on end.

Overall, sailing boats are just usually found in places with abundant wind energy, so there’s a lot of synergy between sailing boats and wind generators. And we’ve pointed out, many exotic sailing destinations in the world have more wind than sun, and that’s before we get started on sailing somewhere like Scandinavia.

A wind generator has a small footprint compared to a solar panel, although it does need a large exclusion zone around it for safety. Wind generators are sometimes mounted up the mast, but we don’t generally advise putting a large, pendulum-like weight at the end of a 50-foot-long lever arm if you can avoid it as it may negatively impact the motion of your boat.

Disadvantages of wind vs solar power

Wind generators do have some drawbacks compared to solar. The obvious one is that they have moving parts, which both present a hazard to the crew and require replacement or regular maintenance.  

The worst-case scenario is a crewmember being struck by the blades. The tips of something like a Silentwind Pro can spin nearly a hundred times a second and get close to breaking the sound barrier.

Here’s an example of where someone accidentally clipped their arm on a sailboat wind generator and it both shattered their arm and sent the turbine blade flying across the cockpit. The author notes that they had also seen the wind generator explode a seagull prior to this incident.

Much of this is mitigated by putting the wind generator outboard and features like electronic brakes, so you don’t need to stop it with your right ulna as the gentleman above did. The upshot is that wind turbines are dangerous in a way that solar panels are not.

The constant motion also generates wear and tear. It used to be worse, back when we used brushed DC motors – but the bearings in brushless motors do eventually wear out too, and they benefit from regular greasing a bit like your winches. It’s just an extra thing to maintain.

It can be too windy for wind generators, too. It can’t be too sunny for solar panels (although it can be too hot). Many modern, top-end marine wind turbines have that electronic brake built in to compensate for this, but you still have to shut down and stop producing when it blows a gale.

Another disadvantage of wind is that it’s really expensive compared to solar on a watt-for-watt basis. Good polycrystalline panels paired with a brand-name MPPT controller might come to $0.50 a watt at the time of writing, while a leading wind generator works out at $5.00 per watt.

This is compounded by the fact that wind does often produce on quite a concave power curve. That is to say, you need a fair amount of wind to produce anything at all, and probably need gusts into the 30-knot range to start to see your rated wattage.

Another often-overlooked point is that if you’re sailing downwind, you are robbing the wind generator of air. If you are sailing downwind in 15kts of breeze, making 7kts, the apparent wind speed at the generator is only 8kts – which might not even be enough to start generating.

Finally, wind generators can be noisy. Again, brushless motors have helped with this significantly, but there is still the rushing of the air over the blades, and any eccentricity in the bearings or blades will send maddening, resonant tremors down the pole and directly into your sleeping quarters at all hours of the night.

The latest wind generators make use of things like acoustic decoupling, a fancy term for having a rubber dampener between the end of the pole and the deck, to mitigate this.

What is a dump load on a wind generator?

A dump load , also called a dummy load or diversion load, is something used in wind power to get rid of excess power when the batteries are fully charged.

One of the small downsides of a power source that runs night and day is the potential to oversupply electricity and overcharge the battery bank.

As an electrical generator supplies more and more power, it gets stiffer and stiffer to turn. The power has to come from somewhere, and it’s felt as resistance – producing a braking effect.

If you suddenly take that braking effect away by disconnecting the battery bank, the wind turbine will start spinning at very high speed, causing anything from rapid and excessive wear on the bearings through to a catastrophic failure where the blades shear off at supersonic speeds.

In order to prevent this from happening, the charge controller has the option to switch between charging the battery and supplying power to a dump load .

The dump load can simply be a big resistor. It will heat up as the wind generator spins on, and safely apply a brake to it by literally just wasting power as heat.

You can probably guess where this is going. Another option is to use an element specifically designed to heat up, and use it to heat water. You can easily buy DC immersion water heater elements for $20-30 , connect them in the place of the dump resistor and use them to make hot water with the excess power instead.   

We’ve often daydreamed about using it to make ice or run a teeny tiny aircon unit as well.

Some of the top-end sailboat wind generators will automatically apply an electronic brake and safely stop the blades when the bank is full, and it varies from model to model whether they simply have that as an option, or it replaces the dump load entirely (including useful ones, like making hot water).  

Do not be tempted to use the dump load to charge a second battery, such as a starter battery, when the first bank is full. If you do, you will encounter problems once the second battery is full and the turbine starts to freewheel.

If you do want to charge several banks at once, or one after the other, you want a split charger connected to the main charging output instead, and a highly resistive load that can run indefinitely on the dump load output.

Marine wind generators vs hydro generators  

Hydro generators are another way of capturing the energy of the wind and turning it into electricity. But instead of capturing the flow of air, a hydro generator is dragged through the water behind a boat under sail.  

The elephant in the room here is that a hydro generator is only going to work when the boat is in motion. A wind generator, on the other hand, keeps on producing while you swing around at anchor.

The average cruiser spends around 90% of their time either at anchor, on a mooring ball, on town quays, or in marinas. This is because the everyday business of cruising is not so much about sailing as it is about fixing the boat, going ashore for provisions or parts, waiting for a weather window, or exploring the place you sailed to, socialising with the other yachties you just met, barbecuing on the deck, and so forth.

The wind generator works through all of that, night and day; the hydro generator only a fraction.

So why does anyone use hydro generators at all, then?

The answer lies in the fact that a traditional trade-wind circumnavigation, by far the most popular way to “sail around the world”, is almost all downwind .

As a result, you are often “running away” from the wind when you sail around the world, which has the effect of subtracting your speed from the true wind speed and deducting that much power from your wind generator.

Thus, if you want to sail around the world on say, a performance catamaran, it might make sense to drag a generator behind the boat instead of in the air. That way, its performance is tied to your boat’s speed through the water rather than the apparent wind.

An adjacent use-case to this is people who “sail around the world” in the sense of not stopping, or stopping very little. Someone sailing non-stop downwind around the world, particularly on any kind of record attempt, would probably get a lot more of out of a hydro generator.

Another place hydro generators are seen is in the regenerative systems of systems like Oceanvolt . In these sophisticated systems, the propellors of the boat itself work as hydro generators by spinning and capturing energy as they’re dragged through the water under sail.

This feature is even starting to show up on electric outboards, such as the ePropulsion Navy series.

In summary, wind generators are the most practical choice for the average cruiser, multi-year circumnavigator or liveaboard sailor. Unless you love sailing so much that desperately want to go and tack around for four hours to charge your batteries – in which case, more power to you.

Wind generators can form an incredibly useful part of the renewable energy mix on board a sailboat.

While wind power on a sailboat works out many times more expensive than solar power, watt-for-watt, it makes up for this by generating power day and night – and often making even more power at times when solar falters, such as during storms.

Cruising sailboats that only have solar power will be forced to generate or motor if it’s cloudy for days on end, something that happens at least once or twice a month somewhere like the Caribbean.

Solar, naturally, doesn’t produce at night either, so if you have a lot of electrical loads running overnight your battery bank can take a beating.

A common example of where you might get caught out is night sailing with the autopilot, radar, AIS and instruments all running, in addition to your regular loads like the fridge.

Wind generators might usually be sized to produce less than a solar array because of cost, space and weight considerations, but they have the potential to run all day and night and in any kind of weather, and as such they often punch above their weight in terms of the overall energy generation picture.

Electrical loads might slow down a little overnight, as the crew sleep and lower temperatures mean fridges and freezers don’t work as hard, but it’s not uncommon for the overnight draw on a sailboat to be 8-10 amps or more. It adds up, by morning. 

Wind represents an excellent bridging technology for nights and extended cloudy spells, naturally producing the most when solar fails – such as during storms. 

A sailboat wind generator is most effective when paired with solar and a good lithium battery bank , allowing you to generate in all conditions. day and night; and to store and retrieve that energy efficiently even at high currents. 

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Better Sailing

Best Marine Wind Turbine Generators For Boats

Unless you are happy burning endless amounts of fuel, a marine wind turbine is an essential item fr an offshore cruising sailboat. In this article, we will be taking a look at some of the best wind generators for your boat.

Today’s cruisers carry so much electrical equipment that wind turbines, solar PV arrays, and hydro-generators are becoming more and more common. The marine wind turbine has been around for several decades now and has gradually been refined to give a much higher degree of efficiency. Better alternators, CAD-designed blades, life-sealed bearings, and smart charge controllers make the latest devices more reliable, quieter, and safer.

Things To Consider When Shopping For a Marine Wind Generator

Horizontal axis vs. vertical axis wind turbine.

The majority of marine wind turbines are horizontal axis devices, either upwind or downwind driven. These are powerful and, as such, need speed and/or charge output limiters, or they can burn out the batteries and self-destruct in storm-force winds. Vertical axis turbines are more suited to trickle charging – usually connected to one or two batteries up to 200Ah capacity. The blade design means they are unidirectional and thus have no need for a bulky tail fin to point them into the wind. They are also considerably quieter than most horizontal turbines and much easier to mount and install.

What Blade Design Should Your Wind Generator Have?

Modern turbines usually sport a one-piece, cast aluminum body and, commonly, three aerodynamically designed plastic/composite blades. One of the first of these models, the original Air-X, worked exceptionally well, particularly in high winds. However, it was so noisy that neighboring boats frequently complained, leaving the owner the option of turning it off or moving well away from other boats. Since then, CAD-inspired blade design has significantly helped to reduce ambient noise levels, although none could be termed silent.

Once your battery bank is fully charged, additional energy from the turbine needs to be dissipated, or the turbine stopped. Low power vertical-axis models don’t usually produce enough to warrant fitting a regulator, but the more powerful models all need some form of charge limiter to prevent overcharging. The simplest form of regulation is to switch it off when no further charge is needed. If you electrically disconnect the turbine, however, it can either damage the alternator diodes or carry on spinning at an even higher speed, so most are electrically ‘braked’ by shorting out their output wires, and a high-current switch is usually provided for this action.

If you leave a turbine running unattended, you’ll need an automatic regulator, and there are two systems commonly available. The first lets the turbine continue to spin and produce power, diverting any that isn’t needed into ‘dump’ resistors to burn off the excess as heat. While effective, it is pretty rudimentary, and you have to be careful where you mount the bulky resistors, which can get quite hot. Alternatively, some use this unwanted charge to pre-heat the hot water tank via an immersed element. Other turbines incorporate ‘pitch control’, comprising feathering blades that either flatten out or turn edge into the wind to regulate turning speed at high wind speeds.

Charge Controllers

A variety of automatic charge controllers are available, some more sophisticated than others, and you don’t necessarily need to use one from the same manufacturer unless it specifically states that you must. A basic model has a voltage-sensitive on/off switch that will trigger at a pre-set threshold battery voltage. The more useful controllers have a built-in display for monitoring turbine output and battery condition. Some can also accept and distribute charge from other sources, such as solar or hydro generation.

>>Also Read: Best Portable Boat Generators

Here Are Some Of The Best Best Marine Wind Turbine Generators For Sailboats

Auecoor solar wind hybrid system – best marine wind turbine generator on amazon.

The Auecoor Solar Wind Hybrid System is the best system to hook your boat/sailboat with. It is a hybrid system that utilizes both solar and wind power generation. This system is highly efficient, it is designed to withstand heavy wind loads, and it is ready to install on a boat/sailboat. They also produce many models to serve your needs, from 500 Watts all the way up to 2000 Watts in optimal weather conditions. 

All models come with a 400-Watt wind turbine generator, and then you can add as many 120-Watt high-conversion, waterproof and flexible solar panels as you need. This unit is also pretty easy to install. The solar panels are easy to transport, and they come with pre-drilled holes for easy installation. This is my personal favorite kind of setup and the one that I believe is the best for any serious boater. It provides 2 renewable sources of power that guarantee that whether you are making a passage or liveaboard in a nice beach somewhere, you will have dependable power as if you were living connected to the grid.

Air Breeze 200

Although the latest generation Air Breeze, made by Primus Windpower, provides an increased charge output, it is also quieter and should apparently outlast its predecessors. Its low start-up speed (4.2kn) means that, on average, it should be able to produce more energy than some higher-rated turbines over long periods of low-to-moderate wind speeds. Though it only has a maximum output of 200W, its output has been optimized to provide a more constant charge in typical northern European and Mediterranean wind conditions. The new Air Breeze weighs less than 6kg and has an integral electronic charge controller and over-speed regulator, rendering bulky dump resistors unnecessary and making installation considerably quicker and easier.

Leading Edge LE-300 or LE-450

A UK company, Leading Edge supplies wind turbines for both marine and terrestrial installation. The LE-300 and LE-450 are available in 12V, 24V, and 48V versions and are remarkably light, making them ideal for sailing yachts. The output is DC via two wires, and a run/stop switch is supplied that breaks the turbine by shorting the output. The units can also be supplied with charge controllers, a dump load style regulator that allows you to leave the turbine on 24/7 without the batteries overcharging. The three-bladed LE-300 is very light (6kg) and one of the quietest of the three-bladed models. However, its output is poor for a horizontal-axis turbine, although it starts spinning in the gentlest breeze. The five-bladed LE-450 is more powerful (105W at 15-knots) while remaining quiet and stable. Another great feature of this wind turbine is that it is the quietest marine wind generator tested.

Rutland 1200

The latest in the Rutland wind turbine line up, the 1200, is Marlec’s answer to the third generation three-blade, permanent magnet turbine models. More powerful than the 914i, it features a ‘Tri-namic’ blade design, which is said to provide a low start-up speed, very quiet running, and more power towards the top end of the wind scale. With a claimed peak production of 483W (that’s 35.5A at 12V) in 29 knots of wind, the 1200 can also supply a very useful 40W of power in just 10 knots of wind – a more realistic average in most waters.

The 1200’s charge controller has dual outputs for two separate battery banks and can accept up to a 20A solar PV supply. It reduces the turbine speed automatically after winds reach 30 knots, regulating the charge without using dump resistors. It also has an integral start/stop switch and can support a remote display, which connects to the controller via a simple Ethernet cable.

Eco-Worthy Wind Solar Power Kit

What can I say? I just love a good wind-solar hybrid power generator. With this kind of setup, you won’t have any problem charging a 12V or 24V battery bank with this hybrid system throughout the day, in any weather condition. The Eco-Worthy Wind Solar Power Hybrid generator can guarantee enough power for you to remain comfortable on your boat and operate any appliance you need and enjoy your time on the boat. You can purchase any model that fits our needs starting from 400 Watts all the way up to 1,400 Watts. However, always buy a generator that has a higher power output than you think you will need because you almost always won’t be in optimal climate conditions.

The blades on this German-built device are very steeply pitched towards the hub, resulting in an early start-up in lighter airs, and they also incorporate tiny fins along their length, said to quieten them at high speed. The blades have a kinetic rotor pitch control system designed to feather them in very high winds, not unlike the large terrestrial wind turbines. With a charge controller in the circuit, the turbine can therefore be left spinning in all weathers without worry. The output is two-wire 12V or 24V DC, so it could, in theory, be directly connected to a battery bank.

It can also be used with a simple short-circuit stop switch, which will slow it down enough to be tied off. The Superwind 350 can also be supplied with a 40A SCR Marine charge controller, which has two independent, diode-isolated outputs for start and service battery banks and dissipates unwanted energy via two large, wire-wound dump resistors. Nominal power is 350W at 25 knots.

Silentwind 400 Wind Generator

As fitted to all boats in the Volvo Ocean Race and featuring ‘Silent Power Blades’ – hand-laminated carbon blades, successfully tested at hurricane speeds – the latest Silentwind 400+ has improved wind tracking and earlier start-up than its predecessor, the 400. Featuring aerodynamics combined with a three-phase Neodymium-Iron-Boron permanent magnet generator, the 400+ is said to have a start-up speed of only 4.3 knots and a peak output of 420W at 30 percent less rotation speed than other 400W generators. 12V, 24V, and 48V models are available.

The Silentwind has a 3-wire AC output, which connects directly to the matching hybrid multi-stage charge controller that enables trickle charging and the connection of up to 20A of solar PV power. An adjustable boost function increases performance and optimizes the power yield, while the LCD displays all the important charge information. When the batteries are fully charged, the turbine automatically stops or switches to trickle charge mode with a significant reduction in rotation speed. It can also be stopped (braked) manually with the built-in switch on the controller.

Rutland 504 Wind Marine Generator

The Rutland 504 is a small and lightweight (just 3.5kg) mini-horizontal turbine from the UK off-grid power specialist, Marlec. The earlier model (503) has proven to be extremely popular over the years, in both the small leisure craft market and in commercial applications such as remote street lighting and signage, buoy lights, ATON power, etc., and the 504 should prove equally so. Like its predecessor, it is very compact, and its blades are ‘encapsulated’ – i.e., they have a protective ring around them to prevent limbs and clothing from getting caught up in the blades. Its output is better than that of the vertical-axis turbines but nowhere near the more powerful generators listed above. It is, however, notably quieter.

Typical output is around 15 knots of wind is 12W (1A @ 12V), doubling to 24W/2A at 20 knots. It also has a lower start-up speed than the vertical turbines and, although it takes around 10 knots of wind to provide any useful charge, its low-friction alternator compensates for the gusts by ‘smoothing out’ its output. The 504 does require a charge controller if it is to be left unattended.

 Leading Edge Vertical Wind Turbine

The LE-V50 and V150 vertical axis turbines are compact, lightweight, and virtually silent. The V50 measures 270mm dia x 456mm high and is intended for trickle-charging batteries or for running low-power devices. Available in 12V, 24V, or 48V versions, it has a nominal output of 12W but a peak of 70W. In typical waters, this results in an average charge of 0.5-1.0A @ 12Vdc in a fresh breeze. The bigger V150 model has a peak output of 200W but a more typical rating of 24W in wind speeds of 15 knots – double that of the V50. 

Leading Edge wind turbines were originally designed to generate power for industrial data monitoring equipment in very remote areas where there is no other power source; these often supplement solar PV arrays in an off-grid sailing situation.

>>Also Read: How to Charge a Sailboat Battery

Final Thoughts

There you have it; these are the best Best Marine Wind Turbine Generators for your boat or sailboat. Whether you are boating/sailing during your holidays or liveaboard full-time, a reliable power source is necessary. It will always provide you with the necessary power to operate your essential electronics, and depending on the power output you go for, it can fill up your batteries without an issue. Remember that when you are out in the water, it will be near impossible that there won’t be enough wind for a marine wind turbine to generate power, so you will rarely be without power. However, that’s why I always sail with both a wind generator and solar panels on board. 

Peter is the editor of Better Sailing. He has sailed for countless hours and has maintained his own boats and sailboats for years. After years of trial and error, he decided to start this website to share the knowledge.

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Best Wind Generators for Sailboats of 2024

Sailing gives us freedom: we don’t need a motor or fuel to travel the oceans. That freedom isn’t absolute. Most sailors still rely on electricity for lighting, refrigeration, small appliances, and to run the electronics that we rely on for navigation and safety. That means we need batteries, and if we rely on batteries, we have to charge the batteries. Since we’re already using the wind to move us from place to place, it makes sense to use that same energy source to keep our batteries charged up and ready for action. Wind generators are increasingly becoming a standard feature on cruising sailboats, and a wide range of products have emerged to meet the demand. This review of the best wind generators for sailboats will help you select the product that best meets your needs.

For more of our top sailing gear recommendations, check out the Best Solar Panels for Sailboats .

Quick Answer - The Best Wind Generators for Sailboats

• AutoMaxx DB-400 View at Amazon
• Primus Wind Power Air-X Marine View at Amazon
• Nature Power 2000W View at Amazon
• Missouri General Freedom II View at Amazon
• Nature Power 400W View at Amazon

Comparison Table - Best Wind Generator for Sailboats

Reviews - the best sailboat wind generator, automaxx db-400.

• Optimal Power AT : 28 MPH
• Rated Output : 400 Watts
• Voltage : 12V
• Minimum Wind Speed : 6.7 MPH
• Maximum Wind Speed : 112 MPH
• Blade Diameter : 48”
• Automatic Braking Controls Your Speed In High Wind
• Built-In Charge Controller And Overcharge Protection
• Maximum Power Point Tracking Gets The Most Power From Any Wind

BEST BUDGET WIND GENERATOR

If you want to try out wind power without spending a fortune and you’re looking for a basic, versatile device suitable for use on land or water, the Automaxx DB-400 is what you need. The durable polypropylene and fiberglass construction of this affordable wind generator resists corrosion and all parts are protected from both water and UV radiation. 

Some reviewers complain that these units fail to spin at the advertised cut-in speed and generated less power than expected, but many others reported performance consistent with expectations. It’s difficult to say whether these deficiencies are caused by installation issues, inconsistent products, or excessive expectations. It’s always good to test your unit on arrival and assure that it’s doing what it needs to do! 

As with all units listed here, you’ll need a mounting pole for this generator, but other than that it’s ready to install: the charge controller is built-in and you can wire it to your battery pack and forget about it!

Primus Wind Power Air-X Marine

• Weight : 13 lb.
• Voltage : Adjustable Output
• Minimum Wind Speed : 8 MPH
• Maximum Wind Speed : 110 MPH
• Blade Diameter : 46"
• Easy Installation: Wire Directly To Battery Bank
• Auto-Brake Regulator Slows Blades When Battery Is Charged
• Built-In Charge Controller
• Marine-Specific Design And Materials

BEST OVERALL SMALL WIND GENERATOR

The Air-X Marine is the Rolls-Royce of small wind turbines. It’s made entirely in Colorado, and the relatively high price is reflected in the features and overall quality of the unit. It costs three times as much as an entry-level unit with the same output rating, but you get what you pay for.

The unit squeezes its mechanical and electrical components into a tiny ultralight package that is ideal for higher mounts and requires much less effort to secure than heavier bulkier units. You get a sophisticated built-in charge controller with external indicators to tell you when you are charging and when your batteries are full, and the unit is fully use-ready. Just wire it to your battery bank and you’re ready to charge.

This unit is one of the most popular sailing wind generators on the market for good reasons. It’s quiet, efficient, and gets the job done with no extra effort and very little maintenance.

Nature Power 2000W

• Weight : 38 lb.
• Optimal Power AT : 45 MPH
• Rated Output : 2000 Watts
• Voltage : 24V
• Blade Diameter : 70”
• External Controller With LCD Output Display
• Industrial-Strength Aluminum Body With Marine-Grade Coating Means This Generator Will Last Your For Years To Come
• Electromagnetic Brake System For Overcharge Control
• Low-Noise Carbon Fiber Blades

BEST OVERALL LARGE WIND GENERATOR

This is the big boy: a full-on 2000 watt marine wind turbine, ready to install and power up some serious juice to feed those hungry batteries. The unit is designed to be effectively maintenance-free, with a coated cast aluminum body and carbon fiber blades engineered for quiet operation. There’s an external charge controller with an LCD output display to let you know what you’re generating and what your charge status is. Electromagnetic braking prevents potential damage from high winds and overcharging.

You’ll need 45 knots of wind to generate the full 2000 watts, but even at lower speeds, you’ll be putting out enough power to keep your batteries topped up. Paired with a solar array, this wind generator will give you all you need for complete energy independence!

Missouri General Freedom II

• Weight : 59 lb.
• Blades : 11
• Optimal Power AT : Not Specified
• Voltage : 12/24V
• Minimum Wind Speed : 6 MPH
• Maximum Wind Speed : 125 MPH
• Blade Diameter : 62.5"
• Rust-Proof Galvanized Components With Zinc-Plated Hub Make This Wind Generator Almost Indestructible
• 28-Magnet Generator For Maximum Power
• Aerodynamically Tapered Carbon Fiber Blades

BEST POWER-TO-PRICE RATIO 

If you’re looking to step up to a higher-output wind system without spending a fortune, Missouri General delivers with the Freedom II. This unit adopts a radically different design philosophy, featuring 11 carbon fiber blades to get maximum power out of wind in the lower end of the charging range. The Freedom II uses a permanent-magnet generator and several other unique design features to achieve high efficiency and durability.

This unit is quite inexpensive on a price-for-power scale, but it does not arrive installation-ready and you’ll have to add a charge controller, a dump load to protect your battery from overcharging, and cables. You’ll probably also need to have an electrician install the unit to assure that those components are correctly connected and working as they should!

Nature Power 400W

• Optimal Power AT : 27 MPH
• Minimum Wind Speed : 7 MPH
• Marine Grade Coating And Sealing For Durability
• Low-Noise Carbon Composite Blades
• Smart Charge Controller For Maximum Output

BEST LIGHTWEIGHT BUDGET WIND GENERATOR

Nature Power turbines are designed specifically for marine use and offer a durable, corrosion-resistant cast aluminum body and whisper-quiet carbon fiber blades. There’s a specialized electromagnetic braking system designed to keep the unit within its electrical and mechanical limits without the wear and tear associated with mechanical braking and a smart controller that adjusts the voltage-to-current ratio for peak charging efficiency. The low weight of the unit makes it ideal for mast installations or other high mounts. As with any relatively low-output wind generator, you can’t expect to rely on this unit for all of your charging needs. It’s very well suited to use in conjunction with solar panels: on hot, still days the sun does the work, and when the weather turns sour or you’re out at sea, the wind will kick in with its share. This is an excellent choice for the wind component of a combined solar/wind generation system.

THINGS TO CONSIDER WHEN BUYING A WIND GENERATOR

It’s important to recognize that while wind power is useful, it isn’t magic. Most modern wind generators will begin generating power in quite light winds, but the output may be minimal and you’ll need sustained higher winds to deliver the charge you want.

If you’re moving downwind, you may get less charge than you expect: if the wind is at 20 knots and your downwind speed is 8 knots, your wind generator will be effectively receiving 12 knots, not 20! Many sailors find that a wind generator combined with a solar array is the most effective power solution, and some add a towed generator that generates power when dragged through the water as an additional option. The power mix that best suits you is something you’ll have to decide, but there’s a good chance that wind will be part of it!

Read through these things to consider to get a better sense of how to choose which wind generator is right for you so that you can get back on the water and enjoy the wind in your hair without worrying about losing electricity unexpectedly!

MANAGE YOUR EXPECTATIONS

A common complaint about wind generators is that they don’t deliver as much power as expected. This is more often a problem of simple physics than an issue with defective units or improper installation. The power delivered by wind increases with the cube of the wind speed, meaning that (keeping things very simple), a 20-knot wind delivers 8 times the power of a 10-knot wind. If you expect a unit that’s rated to deliver 400 watts of power at 28 knots of speed to deliver 200 watts at 14 knots, you will be disappointed, and it won’t be the unit’s fault!

While most units will cut in (start working) at 6 to 7 knots, don’t expect to generate measurable power until you reach 10-12 knots. Remember that if you’re on a downwind heading the apparent wind – the wind speed actually experienced by your generator – will be wind velocity minus hull speed. And remember that most anchorages were chosen because they are protected from the wind.

All in all, you are likely to find yourself generating less power than you expected. That doesn’t mean the installation is useless: it will contribute, it will charge your batteries while you sail, and if used in conjunction with solar panels, it can meet your charging needs. It’s a useful tool, not a magic bullet!

INSTALLATION

Your choice of generator will be affected by your installation options. Some sailors opt for masthead or mizzenmast installations, which can receive up to 50% more wind than lower placements but which are less accessible for maintenance and involve longer cable runs with more resistance. If you’re looking at such an installation, you’ll want a lightweight, low-maintenance unit. Most sailors prefer installation above the cockpit or transom, high enough to keep blades away from people and equipment but low enough for easy access and relatively short cable runs.

WATCH OUT FOR HIGH WINDS

Manufacturers claim very high maximum wind tolerances, but these are often based on wind-tunnel tests using controlled wind from a single direction. Turbulence can increase the burden on the device, and if you’re expecting wind in excess of 50 knots, taking down the generator is a wise precaution.

THE NOISE FACTOR

Noise and vibration were once huge problems with wind generators, with users reporting everything from a repetitive whump to a screaming howl. Modern construction and improved blade design have made turbines much quieter, but noise and vibration can still be issues. It’s great to generate power while you sleep, but not so great to have your generator keeping you awake! You may wish to check out some working installations to get a sense of how much noise is involved.

If you’re wondering whether to go with wind or solar, All At Sea and eMarine have useful articles weighing in on that eternal debate. For more information on Wind Generators, try these articles from Yacht Unlimited and Sail .

FEATURES EXPLAINED

About those numbers.

Rated Output is the maximum number of watts a unit can put out under ideal conditions. These numbers are based on wind tunnel tests and are rarely if ever achieved in the field.

Minimum (or “cut-in”) Wind Speed is the wind speed required to turn the blades. Very little power will be produced at this level.

Maximum Power is achieved at a specific target wind speed. Most units are designed to begin braking or “cutting out” power at speeds above this level.

Blade Diameter is the end-to-end distance between blade tips. You’ll need to consider this distance when mounting the unit to keep the blades well clear of any obstructions.

Voltage is the unit’s output voltage, which needs to match the voltage of your battery array.

Maximum Wind Speed is the highest wind the unit can survive. This may be substantially reduced by turbulence!

SOME COMMON FEATURES

Charge Controllers are devices that regulate the output of your generator to maximize the charging of your battery. Some units have built-in controllers with different levels of sophistication, and others do not.

Braking may be mechanical or electromagnetic and is used to assure that the unit’s rotation will not exceed its mechanical or electrical limits. Electromagnetic braking is claimed by some to produce less wear and tear.

Tracking Systems keep the blades facing the wind and keep the unit from spinning on its mount axis, which will twist the cable and damage the installation.

Blades may be fiberglass or carbon fiber, with more expensive units usually using carbon fiber. Many blades are designed to flex and shed wind if wind velocity exceeds design limits.

Corrosion Resistance is achieved by using a variety of coatings and materials. Marine environments place an aggressive burden on materials and both exterior materials and sealing are very important to keep units working.

A Dump Load is a device that diverts excess power to resistors that radiate it as heat, protecting batteries from overcharging.

For more of our top sailing gear recommendations, check out these popular buyer's guides:

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Pioneering wind-powered cargo ship sets sail

• Published 21 August 2023

A cargo ship fitted with giant, rigid British-designed sails has set out on its maiden voyage.

Shipping firm Cargill, which has chartered the vessel, hopes the technology will help the industry chart a course towards a greener future.

The WindWings sails are designed to cut fuel consumption and therefore shipping's carbon footprint.

It is estimated the industry is responsible for about 2.1% of global carbon dioxide (CO2) emissions.

The Pyxis Ocean's maiden journey, from China to Brazil, will provide the first real-world test of the WindWings - and an opportunity to assess whether a return to the traditional way of propelling ships could be the way forward for moving cargo at sea.

Folded down when the ship is in port, the wings are opened out when it is in open water. They stand 123ft (37.5m) tall and are built of the same material as wind turbines, to make them durable.

Enabling a vessel to be blown along by the wind, rather than rely solely on its engine, could hopefully eventually reduce a cargo ship's lifetime emissions by 30%.

Jan Dieleman, president of Cargill Ocean Transportation, said the industry was on a "journey to decarbonise". He admitted there was "no silver bullet" - but said this technology demonstrated how fast things were changing.

"Five, six years ago, if you would ask people in shipping about decarbonisng, they would say 'well, it's going to be very difficult, I don't see this happening any time soon'," he told the BBC.

"Five years later, I think the narrative has changed completely and everybody is really convinced that they need to do their part - everybody is just struggling a little on how we're going to do this.

"That's why we've taken the role as one of the larger players to underwrite some of the risk, and try things, and take the industry forward."

The Pyxis Ocean will take an estimated six weeks to reach its destination - but the technology it is using has its origins in something much faster.

It was developed by UK firm BAR Technologies, which was spun out of Sir Ben Ainslie's 2017 America's Cup team, a competition sometimes called the 'Formula One of the seas'.

"This is one of the most slow-moving projects we've done, but without doubt with the biggest impact for the planet," its head John Cooper - who used to work for Formula One team McLaren - told the BBC.

He thinks this voyage will be a turning point for the maritime industry.

"I do predict by 2025 half the new-build ships will be ordered with wind propulsion," he said.

"The reason I'm so confident is our savings - one-and-a-half tonnes of fuel per day. Get four wings on a vessel, that's six tonnes of fuel saved, that's 20 tonnes of CO2 saved - per day. The numbers are massive."

The innovation has come from the UK but the wings themselves are manufactured in China. Mr Cooper says a lack of government support in reducing the cost of imported steel prevents the company from making them here.

"It's a shame, I'd love to build in the UK," he told the BBC.

'Throw everything at it'

Experts say wind power is a promising area to explore, as the shipping industry tries to reduce the estimated 837 million tonnes of CO2 it produces each year.

In July it agreed to reduce planet-warming gases to net-zero "by or around 2050" - a pledge critics said was toothless.

"Wind power can make a big difference," says Dr Simon Bullock, shipping researcher at the Tyndall Centre, at the University of Manchester.

He said new cleaner fuels will take time to emerge "so we have to throw everything at operational measures on existing ships - like retrofitting vessels with sails, kites and rotors".

"Ultimately we do need zero-carbon fuels on all ships, but in the meantime, it is imperative to make every journey as efficient as possible. Slower speeds are also a critical part of the solution," he told the BBC.

Stephen Gordon, managing director, at the maritime data firm Clarksons Research, agreed that wind-related technologies were "gaining some traction".

"We have the number of ships using this technology doubling over the past 12 months," he explained.

"This is from a low base, however. In the international shipping fleet and new-build order book of over 110,000 vessels, we have records for under 100 having wind-assisted technology today."

Even if that number dramatically increases, wind technology may not be suitable for all vessels, for example, where the sails interfere with the unloading of containers.

"The shipping industry does not yet have a clear decarbonisation pathway and, given the scale the challenge and the diversity of the world shipping fleet, there is unlikely to be a single solution for the industry in the short or medium term," Mr Gordon predicted.

John Cooper, of BAR Technologies, is more bullish though, saying the future for wind wings is "very rosy."

He also admits he takes a certain satisfaction in the idea of the industry returning to its origins.

"The engineers always hate it, but I always say it's back to the future," he said.

"The invention of big combustion engines destroyed the trade routes and the sailing routes and now we're going to try to reverse that trend, just a bit."

Related Topics

• Shipping industry
• Environment
• Technology of Business

More on this story

The return of cargo-carrying sail ships

• Published 31 July 2023

Shipping agrees net-zero goal but critics unmoved

• Published 7 July 2023

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• Published 3 July 2023

How to Install a Wind Generator on a Sailboat

Last Updated by

Daniel Wade

June 15, 2022

The marine wind generator is, without a doubt, one of the most effective ways of charging your boat's batteries while you are away from the electricity grid. One of the most important things to take into account when selecting a marine wind generator for your boat is the installation process.

As a sailor, you'll most definitely rely on electricity in running various parts of your boat. In addition to the power needed to run the electronics that are of great importance for navigation and safety, electricity is essential for lighting, refrigeration, and running other appliances. But because you always sail deep in the water where there's no electricity, you need another source of power that we can use to charge the boat's batteries while we are out there on the water. This is where the wind comes in handy. You're already using wind to propel your sailboat, so it makes sense to use the very same wind to charge your boat's batteries and ensure that every part of your boat runs smoothly and meets your sailing needs.

Marine wind generators are more and more becoming a standard feature on sailboats. They are a great source of renewable energy and one of the most important things is to learn how to install a wind generator on a sailboat. Installing a wind generator on a sailboat is a process that must start with an assessment of the sailboat's power needs. Knowing the amount of power that your boat will consume in 24 hours will at least give you a rough idea of the size of the battery bank you require and how many amps your charging devices should produce.

You should also know where and how to install the wind generator's system. This will, of course, directly affect how well the wind generator's turbine converts the wind power into electrical energy. You should also ensure that the amount of battery storage available on your sailboat, as well as the controls available, is efficient in ensuring that the generated power doesn't go to waste.

In this article, we'll take a comprehensive look at how to install a wind generator on a sailboat and everything else you need to ensure that your wind generator works properly and efficiently.

Table of contents

The Importance of Using a Wind Generator on a Sailboat

Even though wind generators may not be of much help off the wind, they are increasingly becoming more appealing to sailors looking for an alternative source or extra power for their sailboats. The fact that they rely on the same wind that you use to move from one point to the other makes them quite a hit. Additionally, today's marine wind generators have undergone continuous improvement over the last few decades and are now well proven and quite reliable. This is exactly why wind generators are still common in sailing despite the advent of solar panels and hydro generators.

A wind generator will keep your boat's batteries charged at all times as long as there's wind. It doesn't matter whether you're at the port or out on the water, the wind generator will continuously pump out power even on cloudy days. That's not all; wind generators are cost-effective since they're maintenance-free and do not need any launch or recovery. More importantly, there are very powerful wind generator units that can produce more than 400 units of power, which is just enough to keep a fairly medium sailboat running and operating for 24 hours.

But just like with anything that has advantages, there must be some disadvantages. One of the most noticeable downsides of relying on a wind generator is that the power produced by the generator can significantly reduce if there's no wind. Most wind generators can manage to produce about 200 watts of power in wind speeds of 20 knots but things can even become worse when you're anchored at the port since winds are generally very low at the ports. As such, you may need an additional source of power such as solar panels, especially if your sailboat has heavy power requirements.

Installing a Wind Generator on a Sailboat

Installing a wind generator on your boat's charge system is a serious process that requires careful planning and attention. As we noted earlier, this process should start by first assessing your boat's power needs. You should be able to determine the amount of power that your boat and its appliances need to consume in at least 24 hours. This will certainly give you a clue of what you require.

The general idea is to ensure that you don't have to keep your boat's engine running so as to keep your batteries charged because this might not be enough in running your boat's appliances. In most cases, a boat's power needs are modest. Well, the boat generally needs power for lighting, running the navigation and safety equipment, refrigeration, and powering a stereo, if any.

The Equipment Required

One of the most important pieces of equipment required when installing a wind generator on your sailboat is the turbine. Generally speaking, the turbine should be functional at both medium and high wind speeds. You have to, however, keep in mind that even the biggest wind generator won't produce much power if the wind speed is below 8 knots. The turbine should be tough, reliable, and quiet. You certainly do not want a turbine that sounds like an approaching helicopter as this can be so annoying.

Given that early models are very noisy, three-bladed rotors are becoming more and more popular. They are smartly designed with CAD blades that significantly reduce the whistling and thrumming sounds that occur at the tips of the blades. These modern rotors are also designed to be more efficient and reduce friction through the use of permanent magnet alternators that allow speeds of the blades to be reduced, thereby reducing the noise levels considerably.

With that in mind, some of the best wind generators to go for include Air breeze, Eclectic Energy, Leading Edge, Rutland, Silentwind, and Superwind.

The Aerodynamics of Turbine Blades

Ensuring that power moves from the turbine's alternator and safely into your batteries may seem like a simple process. There are, however, aerodynamics involved and it only makes sense if you understand how they work.

In terms of the blades, they operate based on a similar principle or a plane's wing. There may be some differences but they are generally designed to produce optimum output. This means that the turbine blades should not go too fast as it can mitigate the wind generator's efficiency. The same applies if it is too slow. In essence, it works like a car gear so having very high or low gear can be inefficient. The idea here is that the airflow will become unstable if the blades are at very high speeds.

The best way to solve this problem is to rely on the "tip speed ratio". This technically describes whether or not the blade tips are moving faster than the actual wind speed. As such, the blade tips should be moving at 320 knots on 20-knot wind speed but there should also be the survival speed, which is just the right wind speed that is needed to produce the right amount of power to sustain your sailing needs.

The Amount of Power that Your Boat Needs

It's of great importance to budget for the amount of power to ensure that every facet of your sailboat is functioning properly. Of course, there are obvious appliances such as plotters, interior lights, and fridges. There are also navigation lights, engine monitors, entertainment systems, pumps, watermakers , gas alarms, electric winches, hydraulics, and many other things. You should also make a good margin that will have you covered if there's an emergency.

You should also consider other things such as air conditioning (though this may need fuel) as well as the type of sailing you're planning to do. Will you be sailing upwind or downwind? Well, such minute factors can significantly affect the amount of power that your boat needs. It is, therefore, crucial to determine a clear and accurate idea of how much power you need to generate to perfectly operate every part of your boat.

Mounting the Wind Generator

One of the most challenging things that revolve around how to install a wind generator on a sailboat is where to mount it. Location is very fundamental and can either positively or negatively affect how your wind generator operates.

The golden rule that governs the position of the wind generator is quite straightforward. It should be mounted in an area of the vessel where there will be no interruption of the flow of air or wind to the turbine from all directions. Generally, the wind generator is mounted on the boat's mast with two stays. You can easily raise or lower the wind generator if it is installed with a pivoting base. But if it is installed on a fixed mast, it can cause difficulty if you want to secure the wind generator when there's an impending storm.

And because the main aim is to optimize the output from a wind generator, there are a few important things to do. The most important thing is to ensure that it is very stable. This is because even a slight rolling or pitching might just be enough to rotate it away from the wind. The wind generator also requires clean air from all directions and as much as possible.

As you can see, these two principles seem to be at loggerheads given that you'll get more wind speed as you go higher but this may affect the stability of the turbines. With this in mind, mounting the wind generator on mizzen masts can be a good option but choosing to mount the turbine just above the cockpit is an even better option. The idea here is that it will be a lot easier to manually control the turbine if all other options of braking it doesn't work. Again, installing and maintaining the turbine overhead the cockpit is a lot easier than when it is mounted on the mizzen masts.

That's not all; mounting the turbine over the cockpit also means that the cables need to transport power from the turbine to the alternator are much shorter. This means that the wire diameter will be a lot smaller without necessarily affecting the voltage. The fact that the voltage can drop if the wind generator is mounted up higher on the masts should be particularly important.

This is because it can affect the overall performance of the wind generator and the power it produces and this means that the power supplied to your sailboat might just fall short. Again, a considerable amount of weight can be reduced if the turbine is mounted just over the cockpit. The cables will be reduced and the overall stability of the wind generator will be increased if it is installed overhead the cockpit.

Of course, you'll also have to install the electrics that come with the wind generator unit. For example, there's the controller that is used in regulating the power supply from the turbine, as well as the dump load resistor that is essential in absorbing any excessive current that may be produced when the batteries are fully charged. There's also an inline stop switch, which is essential in turning off the unit when it's not in use. Well, most of these installations are straightforward and are generally shown in the unit's installation guide.

Assembling the turbine should also be a walk in the park. Units do come with fasteners and are accompanied by installation instructions that are easy to understand and follow, thereby making the installation and assembling process a breeze.

So if you've decided to install the wind generator overhead the cockpit, which is our best location, you must find a perfectly sized pipe and mount it solidly at any corner of the stern. You have to ensure that you support the pole with at least some diagonal tubes so that it doesn't swivel. And if you are planning for an off voyage escapade, using the hose clamps to secure the main pole might not be the wise thing to do. This is because they'll most likely snap and twist as a result of constant vibration and miles of hard sailing.

Securing Your Boat's Wind Generator

With that in mind, you should also be prudent enough to secure the wind generator if there's a pending storm. As a sailor, you should be prudent, stay alert, and prepared in case there's a storm. The most important thing is to know the dynamic of the wind generator and how to apply electric brakes or even have the turbines lowered when there is a storm.

You can do this if the wind speeds are more than 15mph. This is of great importance in ensuring that the wind generator does not overheat or the blades do not break. You can also choose to remove the wind generator altogether and store it in a safe place.

All in all, the importance of having a wind generator on your sailboat as an alternative energy source can never be downplayed. This is a great source of renewable energy that will have your boat working perfectly well even if you are sailing in some of the remotest corners of the world. Just know how to install the wind generator, have it maintained, and protected when there's a pending storm and you'll be good to go.

Until next time, happy Sailing!

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I've personally had thousands of questions about sailing and sailboats over the years. As I learn and experience sailing, and the community, I share the answers that work and make sense to me, here on Life of Sailing.

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The ZEN50 is a game changer. World’s first series production catamaran equipped with a wingsail, it defines a new distinctive class of its own, where genuine zero-emission meets high comfort and performance, limitlessly. 

Designed from scratch for ZEN Yachts by award-winning naval architect Julien Mélot , this full carbon catamaran is the ultimate essence of technology driven, high performance and luxurious, eco-friendly leisure yachting. 

The blue water capable ZEN50 lightweight racing carbon hulls are combined with a huge solar roof for an unrivaled solar power vs. displacement ratio above 1:1 (18 kW / 17 tonnes), making this yacht completely energy self-sufficient. A revolutionary, fully automated, wingsail - by Ayro© - can be added as a range and speed extender. The yacht’s high capacity battery bank powers a powerful silent electric propulsion, allowing the ZEN50 to achieve 14 knots and maintain high continuous speeds in unrivaled safety and comfort, indefinitely… 

The ZEN50 is offered with or without wingsail and comes in 3 main different versions: Racer, Cruiser and Explorer, each dedicated to a different usage and owner profile. We use these versions as a basis to define a final, bespoke specification for each of our valued clients and ZEN Community Members. Scroll down for more details, specifications and prices.

1st WINGSAIL series production yacht in the world!

The OceanWings32 - by Ayro© - was initially developed for Team Oracle, for the America’s Cup 2010 in Valencia. Over years, it has further been developed and automated by VPLP and was installed on Energy Observer in 2019. Two years of field feedback have allowed the Ayro team to fine tune the algorithm commanding the wingsail. The ZEN50 is the first series production leisure craft to be equipped with this fully automated wingsail. It is controlled at the touch of a finger on screens, is automatically adjusted and has several safety modes and features. The two parts of the wingsail can be hoisted and lowered independently and with the simple touch of a button. The wingsail OceanWings32 is the ideal complement for the solar roof for those wishing to cruise long distances off-shore with zero-emissions.

Greatest ratio SOLAR POWER / weight on the market

At 17 tonnes lightweight and 18,000 W of peak solar power, the ratio of the ZEN50 is at over 1 kW per displaced tonne of water or beyond 1:1 which is far beyond any other blue water CE Cat A yacht in this size range. Lots of solar power for little water to displace is the strong and healthy foundation the energy self-sufficient ZEN50 is built upon.

Performance CARBON sandwich hulls

The hulls of the ZEN50 have been designed from a blank screen for ultimate efficiency - understand minimum drag or minimal energy consumption for a range of speeds from 6 to 10 knots. Their shape is aggressive, sharp and slender. Their reverse bows cut through water like a sword cuts through butter and their curvature is reminiscent of graceful dolphin bodies. These hulls are undoubtedly of the performance type and are built with the best available composites: Carbon fibre and Corecell™. The combination of high strength, low weight and performance design allow the ZEN50 to reach speeds of up to 14 knots.

INFINITE range at high CONTINUOUS speeds

With maximized solar and wind power and minimized energy consumption… the ZEN50 can sail continuously at speeds varying between 6 and 10 knots. Thorough simulations in various sea states and weather system have consistently shown the ZEN50 will be able to achieve performance catamaran speeds continuously without using a genset. With the ZEN50, the world is your oyster and the wildest destinations are within your reach with this self-reliant vessel!

True ZERO-EMISSION operation

The first ZEN50 unit, whose construction started in March 2023, will not be equipped with a genset at all and will not have any fossil fuels onboard. The ZEN50 energy system with its very large capacity 160 kWh battery bank, has been designed to function for days in complete safety with minimal solar energy harvest and no wind. It is perfectly safe with no backup genset and operates 24/7 without any polluting emissions.

NO FUEL , no costs

Naturally, requiring no fuel to operate day in day out is great news for the environment, it is also fantastic news when sailing into remote areas where fuel bunkering might be near impossible or where the fuel quality might be an issue. Finally, it also makes a massive difference in this yacht’s costs of operation. Imagine the hundreds of liters of diesel saved over just a week, the obsolete engine maintenance schedules, the clogged filters and dirty tanks from another age… Welcome to a new burden-free, energy self-sufficient era, welcome to clean and graceful eco-yachting, welcome to ZEN Yachts.

Highest SAFETY & reliability

At ZEN Yachts, we have made some design choices to attain energy self-reliance with the ZEN50 that reduces the habitable volume in the hulls, similar to performance catamarans. Where we have not and will never compromise is on safety. Our main voltage system is 48V making it perfectly safe to work on. The level of redundancy of the batteries and solar panels is 10! The main electrical architecture is split in 2 so that should anything happen on 1 hull, the entire vessel can still operate normally. There are 2 independent helm stations and the ZEN50 is packed with special safety features, nonsubmersible compartments and we can even offer an in-depth practical course on safety equipment usage and management. Sailing with the ZEN50 is not only exhilarating and clean, it is ultra safe!

Unrivaled space & COMFORT

The ZEN50 offers the speeds of a performance catamaran, the comfort of a large motor yacht and the simplicity of an electric car. No less than 2 large day beds, 3 dining areas for over 10 people, 1 professional galley and 2 wet kitchens, 5 heads, up to 4 double ensuite cabins, 1 bunk double and 1 single together with both saloon and dining areas converting into extra sleeping areas, this is simply unrivaled on a 50 ft. catamaran. Add an electric tender, dive compressor, satellite internet, 2 helm stations (cockpit and flybridge), a solar roof that converts into a gigantic upper deck to enjoy the most epic sunrises and sunsets, welcome onboard the ZEN50!

SPECIFICATIONS

Main particulars.

• Length Over All: 15.7m

• Beam: 8.4m

• Depth Molded: 2.7m at midship

• Displacement (light) : 17 T

• Draft (design): 1.3m (4.3ft) incl. keel

• Passenger Capacity: 12

• Berths: 12 (4 x double + 2 x single + saloon)

• Building Material: Carbon Fiber - Corecell™ composite

• Certification: CE Cat A - Unrestricted with 12 persons

Note: Some of the above figures may vary between versions

PROPULSION & ENERGY

• Propulsion: 2 x 50 kW brushless DC motors

• Main Battery Pack Capacity: 160 kWh Lithium

• Solar Roof Peak Power: 18 kWp

• Wingsail: Oceanwings® OWS 3.2 by Ayro©

• Backup Battery Pack Capacity (Nav/Com/Wing): 5 kWh Lithium

• Main System Voltage: 48V - Low voltage for total human safety

• Accommodation Voltage: 110V or 220V

SPEED & RANGE

• Max. Speed on e-motor only: 10 kn

• Max. Speed on e-motor & Wingsail: 14 kn

• Cruising Speed for continuous operation - solar only: 4.5 - 5 kn

• Cruising Speed for continuous operation - solar and wing: 6 - 10 kn

• Cruising Speed day time: 8 - 10 kn

• Range Over 24 h: 180+ nm

Note: These values may vary between versions and sea / weather conditions

EQUIPMENT INCLUDED - RACER VERSION

• Integrated power management system

• Solar power & energy storage system

• Electric propulsion system

• By-wire steering system

• Helm stations at cockpit & flybridge

• Galley counters, storage, sink, oven, stove, fridge, freezer

• 4 en suite heads with enclosed shower, toilet, sink & faucet (in each head)

• All cabin furniture (as shown in layouts)

• Aft deck fixed dining table and aft sofa with collapsible back rest (as shown in layouts)

• Fore deck day bed and lateral seats (as shown in layouts)

• Outdoor marine cork decking / indoor saloon natural bamboo decking

• All cushions In/Outdoor upholstered with Sunbrella® fabric

• 6 deck hatches

• 2 x 500 liter (2 x 132 gal) fresh water tanks

• 2 x 100 liter approx. (2 x 26 gal) fresh water tanks + 1 fresh water pump

• 2 x 350+ liter approx. (2 x 92 gal) holding tanks

• Railings, cleats and fore deck trampolines

• Mooring equipment: 33 kg Rocna® stainless steel anchor + 50 m stainless steel chain 10 mm + 150 m nylon rope + e-windlass

• Regulatory navigation equipment including navigation lights & mast

• 2 x chart plotter 16”; 2 x VHF with DSC button

• Regulatory Life Saving Appliances

• Critical spare parts kit

Note: The above equipment is for the Racer version. Cruiser & Explorer versions carry additional equipment

ZEN50 Solar Wingsail Electric Catamaran - Solar Roof Layout

ZEN50 Solar Wingsail Electric Catamaran - Flybridge Layout

ZEN50 Solar Wingsail Electric Catamaran - Main Deck Layout - Asymmetric D (subject to changes)

ZEN50 Solar Wingsail Electric Catamaran - Cabin Layout - Asymmetric D (subject to changes)

ZEN50 Solar Wingsail Electric Catamaran - Cabin Layout - Asymmetric E (subject to changes)

SOLAR & WINGSAIL

OCEAN RACER

Solar & Wingsail, basic configuration ready to sail, navigation, safety, fridge, etc.

EUR 2 400 000

WORLD CRUISER

Solar & Wingsail, well equipped configuration with, among other options, electric tender, AC and water maker

EUR 2 650 000

ARCTIC EXPLORER

Solar & Wingsail ultimate configuration with all available options

EUR 2 850 000

Solar only, ready to sail basic configuration with navigation, safety, fridge, etc.

EUR 1 850 000

CONTINENTAL CRUISER

Solar only, well equipped configuration with, among other options, electric tender, AC and water maker

EUR 2 100 000

TROPICAL EXPLORER

Solar only, ultimate configuration with all available options

EUR 2 300 000

Ready to reserve your ZEN50?

Want more information .

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NPR's Climate Week: A Search For Solutions

New technology uses good old-fashioned wind to power giant cargo vessels.

Scott Neuman

Pyxis Ocean sets sail in August on its first voyage since being retrofitted with WindWings. Cargill hide caption

Pyxis Ocean sets sail in August on its first voyage since being retrofitted with WindWings.

Well over a century after the Age of Sail gave way to coal- and oil-burning ships, climate change concerns are prompting a new look at an old technology that could once again harness wind to propel commercial cargo ships — this time with the goal of reducing greenhouse gas emissions.

Imagine what looks like Boeing 747 wings with movable flaps, set vertically on a ship's deck. The vessel cruises under minimum power from its giant engine as computerized sensors adjust the fiberglass wings to take advantage of the wind's speed and direction. This wind-assisted propulsion saves a substantial amount of fuel and reduces the carbon belching from the ship's stack. Many experts think the idea has the potential to navigate the notoriously dirty shipping industry toward a greener future.

"Shipping is kind of unique," says Gavin Allwright, secretary-general of the International Windship Association (IWSA), a not-for-profit trade organization that advocates for wind propulsion in commercial shipping. From antiquity, ships used clean and free wind energy, "then we carbonized and now we're going back to zero carbon."

At least that's the hope.

The shipping industry could save fuel and cut down on emissions

About 90% of the world's goods — everything from soybeans to sneakers — are transported by sea. The tens of thousands of ships used to get these goods to global markets account for an estimated 3% of the world's carbon emissions each year, a figure that exceeds Japan's annual emissions. Left unchecked, the shipping industry's greenhouse gas emissions are expected to grow 50% by 2050 .

Although commercial shipping wasn't included in the 2015 Paris Agreement, there's a huge economic incentive for the industry to decarbonize. The European Union's Emissions Trading System will cover the maritime industry beginning next year, meaning shippers will be forced to pay for their carbon emissions.

Also in 2024, the United Nations' International Maritime Organization (IMO) will grade each ship based on its cargo-carrying capacity and how many grams of CO2 it emits per nautical mile. Vessels with the poorest ratings will be required to take corrective action or risk not being allowed to operate. It's part of the IMO's ambitious goal to get the shipping industry to net zero emissions by 2050.

Climate solutions are necessary. So we're dedicating a week to highlight them

Allwright says renewed interest in windships started to gain steam in the early 2010s, and today there are about 30 large commercial ships using one of a number of such technologies. Shipping giants Maersk and NYK are already experimenting with such systems. As many as 20 more are expected in the months ahead. So far, they are mostly "testbeds" to see if the concept is commercially viable.

In one recent trial, the 751-foot bulk carrier Pyxis Ocean operated by Cargill was retrofitted with two rigid sails, known as WindWings, inspired by those found on modern America's Cup racers . The vessel, carrying only water ballast, arrived in Paranaguá, Brazil, last month after an approximately 10,000-nautical-mile journey from Singapore.

The articulated fiberglass and metal wings, which stand 123 feet tall, use the force of the wind to create lift and move the ship forward. The wings can be folded on deck in case of unsuitable wind or heavy weather and while in port, where they would interfere with loading and unloading operations.

John Cooper, the CEO of BAR Technologies, which developed the WindWings, says it took considerable engineering and computer modeling to move the concept from high-tech racing boats to a commercial bulk carrier. On the America's Cup boats, "the hydrodynamic resistance is quite low," he says, compared to the "humongous" dynamic drag of a commercial ship.

On its first voyage last month after it was retrofitted, the 5-year-old Pyxis Ocean hit 16.2 knots (18.6 miles per hour) with the WindWings working in tandem with the ship's engine running at minimum power, Cooper says.

Before departing for Brazil, the ship even sailed briefly without the engine. "We pulled the anchor up, we put the wings up, turned them into their flying shape, and we cruised our way off berth," he says. "The crew were dumbfounded."

Variations on the rigid wing concept are being tried elsewhere. One system, first developed in the 1920s, is a bigger departure. "Rotor sails ," or large carbon-fiber cylinders, move a ship along using a principle known as the Magnus effect, an aerodynamic force perpendicular to both the direction of the airstream and the axis of the rotor.

"I would say there's a competition right now," says Matthew Collette, a naval architect who teaches ship design at the University of Michigan. The wings on Pyxis Ocean are "more complicated, [but] potentially more efficient. The rotor sails are very simple, a little bit more limited in what you can do with them."

"But no one is talking costs openly," he adds.

In the case of WindWings, Cargill and BAR say a prototype system installed on a retrofitted ship is not a good indicator of ultimate cost, either for an initial installation or for operation. Ships built from the keel up to optimize the wing technology will show a clearer picture.

How a European law might get companies around the world to cut climate pollution

Allwright of the Windship Association estimates that, on average, wing technology amounts to $3 million to $4 million tacked on to a $100 million ship. "It's not insignificant, but it's also not a huge expense," he says.

With so many overlapping interests in the shipping industry, simply getting agreement to try a system such as WindWings is no small matter, according to Jan Dieleman, president of Cargill Ocean Transportation.

"You have to work together and somehow share the risk," Dieleman says. "An owner is not just going to put all kinds of installations on [a] ship if they don't know if somebody is actually going to pay them for that."

MC Shipping, a subsidiary of Mitsubishi Corp., owns the Pyxis Ocean, but Cargill, which operates it on long-term lease, agreed to put up the money for the WindWings installation, with help from a small EU subsidy. "We get the fuel savings because the fuel savings go to the operator and that's how we are going to make it work," he says.

Newer, cleaner fuels are another idea to cut emissions

On a retrofitted ship, such as the Pyxis Ocean, it could take anywhere from seven to 10 years to recoup the initial investment of wing technology, "which is not extremely sexy for the average commercial operator in this industry," Dieleman acknowledges.

The shipping industry is also looking ahead to new fuels, such as ammonia and methanol, that would be cleaner burning and put out less carbon — especially if used with new wind technologies. Those cleaner fuels, however, are likely to be much costlier than today's relatively cheap, but more polluting ones.

WindWings being fitted on Pyxis Ocean at the COSCO shipyard in Shanghai, China, in August. Cargill hide caption

WindWings being fitted on Pyxis Ocean at the COSCO shipyard in Shanghai, China, in August.

Fitting WindWings or a similar technology on a cargo ship or on oil tankers is no easy task, but it's simpler than retrofitting some other types of vessels, Collette says. "The deck space is a high priority on both vehicle carriers and container ships. So you're now giving up cargo as well as potentially modifying the ship design," he says. Despite those potential obstacles, earlier this year the French firm Zéphyr & Borée placed an order with South Korean shipbuilder Hyundai for five purpose-designed container windships with methanol-fueled engines.

Vessels designed and purpose-built as windships that burn cleaner fuel are the future that Dieleman envisions. It could cut a 10-year payback for WindWings to just three to five years, he says. In that case, it becomes "something very interesting on a ship that normally has a lifetime of, say, 20 to 25 years."

A kid's guide to climate change (plus a printable comic)

And fuel costs could be cut by nearly a third if a vessel were built specifically with WindWings in mind, according to Dieleman.

While the Pyxis Ocean continues its trial, BergeBulk, which owns and manages a fleet of some 80 bulk carriers, also plans to install WindWings on one of its vessels. And rotor sails made by Finland-based Norsepower have been installed on commercial vessels in China and Japan .

WindWings may be an entirely modern take on the old sailing ships, but the technology could revive some of the old clipper ship routes that have long fallen out of favor, BAR's Cooper says.

"You can see some of those old routes coming back," Cooper says. "You know, there's probably an argument for continually circling the world in a single direction rather than going backwards and forwards. Just keep going round the world to take advantage of the trade winds."

NPR's international affairs correspondent Jackie Northam contributed to this report.

Correction Oct. 5, 2023

Previous audio and digital versions of this story said the IMO's goal was to cut the shipping industry's greenhouse gas emissions at least in half by 2050. In fact, a revised goal put out earlier this year calls for the industry to reach net zero by mid-century.

• climate change
• Paris Climate Agreement
• cargo ships

My Cruiser Life Magazine

Choosing a Wind Generator for a Sailboat – Complete GUIDE

Nothing denotes a salty off-the-grid ready yacht more than the sight of a wind generator mounted on the stern. Once, these were the main component of a sailor’s renewable energy arsenal. 

But today, as is the case with wind generators for RVs , the technology has fallen behind the fantastic strides that solar panels have made. Today’s solar panels are less expensive and more efficient than ever before, while wind generator technology hasn’t progressed much in the last 50 years.

Still, there are limited times when wind generators make the most sense on sailboats. Here’s a look at who could benefit from one and five of the best options on the market.

Table of Contents

Is a wind generator right for me, how much power do i need, alternatives to wind power, things to look for in a marine wind generator, 5 great marine wind generators.

Before you dive into the whirlwind of information out there about marine wind generators, take a step back for a reality check. Wind generators were the standard-bearer for years onboard sailboats, but in the 21st century, their usefulness has all but been replaced by solar panels. Solar is efficient, silent, and completely maintenance-free. 

As a result, the usefulness of a wind generator is now much more limited. There are many pros for wind generators—but most of them can be negated by one simple fact–the amount of usable power they produce is significantly less and more expensive than solar. 

Furthermore, the two times when a wind generator does make sense are not conditions typically encountered by most cruisers. Wind generators are only effective for significant power when the apparent wind speed on deck is more than 15 knots. That’s apparent wind speed on deck—meaning most downwind sailing in winds less than 22 knots true or so would be out. 

And then there are anchorages, where sailors hope that a wind generator will help them live off-the-grid to avoid a generator or engine recharge. How many anchorages have you recently sat in that had a constant 15 to 20 knots of undisturbed wind blowing through them? Most of the time, we’re trying to get out of conditions like that, not anchor in them. 

There are some parts of the world where these conditions are the norm. Caribbean trade winds and high latitude winds make wind generators more attractive. Those sailors stuck in the “horse latitudes” in between will find their wind generators silent and motionless most of the year. 

The other time that adding a wind generator makes sense is when there is simply no other renewable energy option available. A wind generator can mount in many ways on nearly any type of sailboat. It has a tiny footprint, unlike a large solar array. 

The bottom line is this—only add wind power when you have absolutely no space left for solar. If you’re maxed out on solar, a wind generator can give you a little boost. But another solar panel will consistently outperform a wind generator—unless you’re that rare sailor whose anchorages of choice feature steady and uninterrupted 20-25 knot winds.

Pros and Cons of Wind Power for Boats

• 24-hour per day operation (as long as it’s windy)
• Small installation footprint, compatible with most sailboats
• Good options when solar panels cannot be used due to mounting problems or shading (especially on ketches)
• Very low power generation in most conditions
• Ugly and bulky, mast and mount included
• Not effective when sailing downwind (like most tradewind sailing)
• Not effective in protected anchorages
• Maintenance intensive, moving parts and bearings wear out
• Limited controller options, many not compatible with LiFePO4 battery systems
• Expensive compared to solar

When calculating your requirements for off-the-grid living, the math does not lie. The problem is not lying when you do the math. You can find many calculators and spreadsheets online to help you make the basic calculations.

First, you need to know precisely how much power every electrical consumer on the boat will use and how long it will run each day. These items are often variable—refrigerators will have to run longer in hot climates and the summer, and lights will burn longer during the dark winter months. For everything that uses electricity, calculate the watts used per day (24-hour period).

Next, you’ll want to take into account how much power is being generated. It’s impossible to get accurate numbers for your setup until you’re out there doing it. In general, solar can be counted on for its maximum output for three or four hours a day. How many sunny days a year depends on your location. Again, there are many calculators online.

The wind is good for 24 hours a day, of course, but the wind is seldom that constant. So when calculating the math for a wind generator , it’s very easy to feel good about the choice. But practice has routinely shown that even a small solar array will outperform it in nearly every location.

As already mentioned, the number one choice for most sailboats for renewable power is solar. Solar panels are inexpensive and last for decades with zero maintenance. The downside is that they require a lot of shade-free space to work best.

For boats looking to make power during offshore passages, hydrogenerators are another solution. As long as the boat is cruising at six knots or more, the water passing by has enough potential energy to run electronics and charge batteries. The Watt & Sea Hydro generator is one of the best options out there, but there are also towable generators that do not require permanent installation. Some boats even have the option to use the free-spinning propulsion propeller to create electricity. Of course, these options only help charge the batteries when the boat is moving under sail, and only then at fast speeds. 

Power Output

The first thing to realize is that you must take manufacturer’s ratings for their units with a grain of salt. The numbers are engineering calculations for ideal conditions. That is to say, conditions that a marine wind generator will likely never get to experience. 

Of all of the performance numbers worth considering, perhaps the most interesting numbers are those at the low end on the scale – when does the unit start producing power, and how much. Most of us boat in places with 15 knots of wind or less most of the time, so this is the range your wind generator will sit in for most of its serviceable life.

Noise Level

First and foremost – do not be fooled by online reviews. Every wind generator on the market produces noise. Since the noise is generated from multiple sources, it can be hard to compare apples to apples when shopping for a generator. 

Blade design has a significant effect on noise – some blades are simply noisier than others. Not only does the blade’s aerodynamics make noise, but they can also cause vibrations. All wind generators will require occasional rebalancing and adjustment to minimize vibrations from the blades. 

The moving parts inside the generator can also cause noise. Most are mounted with standard ball bearings that can and do go bad. Many manufacturers advertise these as maintenance-free, but that’s simply unrealistic in the marine environment.

Finally, the mount on the boat is a significant source of noise because it transmits the blade’s vibrations, no matter how minor, into the boat’s structure. Proper mounts have rubber dampening pads built-in, but even still, some noise will get through. This can sound like a buzz, hum, or even a thumping noise.

Quality of construction plays a huge part in how much noise a wind generator makes. As a result, you get what you pay for with wind generators. Unfortunately, the inexpensive hardware store models built for residential use are typically the noisiest. 

You can compare the noise output of various wind generators by taking a stroll around the marina docks or a dinghy ride around the anchorage. Bad or poorly-maintained wind generators can be heard from many boat lengths distance. On the other hand, a high-quality unit will be difficult to hear when you’re standing under it, much less on another vessel.

Correct Voltage

Wind generators should be matched to your primary battery bank—the one that you’ll be charging. Most boats will be 12 volts, and a few will be 24. 48-volt systems are becoming more popular on electric yachts and those using the battery bank for big consumers like air conditioning. These are the exceptions to the rule, however. 

Charge Controller Functions

Unlike solar, wind generators are typically matched to the charge controller that the manufacturer packages with the unit. There are simply a lot more factors that go into regulating a wind generator, including the generation technology it uses and how it brakes or diverts its load. 

Charge controllers are either PWM (pulse width modulation) or MPPT (maximum power point tracking). PWM is a less expensive technology, while MPPT controllers are more expensive. In the world of wind generators, which one a controller features is a bit of a toss-up. Some manufacturers swear by MPPT, while others say there is no benefit to the added cost. 

Most solar chargers accept a solar input, usually only about 100 watts, though. It’s probably more efficient to run your solar array on its own MPPT charge controller. But if you’re only planning on installing a small array and don’t want the hassle of programming separate charge controllers, having the option with your wind controller is a very nice feature. 

Finally, the programmability of the charge controller is a significant factor. Very few of the older PWM charge controllers allow you to input charging profiles. Again, this is less of a problem with wind power than with solar. But if you’re planning to use less forgiving battery chemistries like lithium, you’ll want as much control as you can get from your controller. 

Brake and Automatic Cut-Off

Being able to cut a wind generator off in an over-power or over-speed scenario is extremely important. All wind generators come with some form of braking system. The brake needs to be used when the system reaches a full charge, or the wind speed goes beyond the wind generator’s limits. 

Remember that the generator’s not simply limited by what the blades and bearings can handle. There is also the strength of its mounts to consider. For example, a 60-knot gust on a free-spinning generator will impose an unbelievable force on its mounts.

Then there are wiring considerations. The wind generator is only designed to output so much power, and during your installation, you must use wire sized for the maximum output. What happens if more than that amount of current goes through wires due to a brake failure? Heat and possible battery damage will result, but hopefully, the circuit breaker or fuse will cut it off before then. 

Some have aerodynamic brakes that turn the generator as wind speed increases. This theoretically means that it can never go over its designed limits.

Others feature a brake that is automatically or manually activated. It’s designed to come on when the current reaches a maximum, such as during powerful wind gusts. It also breaks the unit to a stop when the batteries are fully charged. 

An alternative plan is to have a diversionary load. Some wind generators will come with dump loads, which are nothing more than ceramic heating elements. When the wind generator produces too much power, power is redirected from the batteries into these heating elements. They’re also used when the generator produces too much power for the system during storms. 

Mounting and Unit Weight

The mounting mast used to secure the wind generator is sometimes more complicated than the wind generator itself. It must be strong and stayed from all angles. Stainless tubes with two supports are commonly used to mount them to the back of yachts. 

The construction and position of the wind generator are essential to reduce vibrations and noise within the boat. Don’t mount a wind generator over someone’s bunk! All proper mounts have sound-deadening materials like rubber grommets built in to make them as quiet as possible.

The blades of a wind generator must be positioned so that they can’t catch any lines, canvas, or flags from other parts of the boat. This makes stern-rail mounting almost impossible on ketches and yawls. On these boats, mizzen mast mounts are often the best alternative. 

Keep in mind as well that the spinning blades of a wind turbine are like spinning knives. Sailors have lost fingers trying to secure wind generators during storms. Therefore, they should be mounted high enough that it is impossible to accidentally come in contact with the blades during normal operations. 

As mentioned before, another critical component of the mounting is calculating the correct wire size. This is calculated from the unit’s maximum output, the round-trip length of the wire run, and the unit’s charge voltage.

Finally, the positioning of the wind generator should supply it with uninterrupted airflow. If the wind is blocked, even slightly, but a mast, sail pack, or hardtop, the wind generator’s efficiency will be negatively affected. These items could also induce turbulence into the air being supplied to the turbine, which could result in vibrations and noisy operation.

When shopping around for wind generators , notice that power output is not one of our main criteria. This might seem odd, but all of the wind generators on this list produce more or less the same amount of power in a given wind. Some start producing at lower speeds, and some keep producing at high speeds, but in general, these occurrences are so minor and so rare that they don’t calculate into the shopping process.

Eclectic Energy D400

The D400 has a legendary reputation among cruising sailors as the wind generator of choice. It is nearly silent to the point of being very difficult to hear. It is built by Eclectic Energy in the UK, and you can spot its distinctive shape and five-blade design on yachts worldwide. 

For all the pluses, there are some detractors from the D400. For one, it is pretty much the most expensive option. It is also the heaviest—it requires a much beefier mount than other options do. 

SilentWind Pro

The SilentWind has a few advantages over many other wind generators. For one thing, the included MPPT charge controller features Bluetooth programming via a smartphone or tablet. In addition, you can set many parameters for the charge profile—meaning that it is one of the few wind generators that are at least somewhat compatible with the next generation of lithium marine battery systems. 

Compared to the D400, the SilentWind has a more lightweight and compact body. It’s a three-blade design that features blue composite fiber blades. The SilentWind is made in Portugal. 

Rutland 1200

Rutland is the wind power branch of the Marlec renewable power company from the UK. Rutland makes a wind range of wind generators for yachts of all sizes. The 1200 is a three-blade generator that features an MPPT controller with a solar input. At 10 knots of wind, it produces about 40 watts of power. 

Primus Air Silent X

Primus makes a variety of wind generators from their facility in Colorado. The “top-of-the-line,” so to speak, is the Air Silent X. It’s an upgraded version of their Air X that comes supplied with quieter blades made of distinctive blue carbon fiber.

Superwind 350

The German-made Superwind has a unique overspeed and overcharge protection system—the units feature feathering blades. This is undeniably more complex than many other options on the market. These generators are designed to be installed in grueling conditions where a damaged generator cannot be repaired quickly. Their primary market is aimed at remote telecommunication equipment stations and offshore sailors.

Matt has been boating around Florida for over 25 years in everything from small powerboats to large cruising catamarans. He currently lives aboard a 38-foot Cabo Rico sailboat with his wife Lucy and adventure dog Chelsea. Together, they cruise between winters in The Bahamas and summers in the Chesapeake Bay.

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Wind generators – buyers’ guide

After a flurry of recent technological developments, Duncan Kent compares the latest high-output wind turbines

Three-bladed rotors have become increasingly popular. Although early models were quite noisy, smart CAD-designed blades have considerably reduced the thrumming and whistling sounds by removing the turbulence around the blade tips. Furthermore, the use of more efficient, low-cogging (less initial friction) permanent-magnet alternators has also allowed blade speeds to be reduced, further limiting ambient noise levels.

AIRBREEZE £1,169.50

The Airbreeze is easy to assemble as everything is contained within the casing, requiring only a quick blade assembly before being ready to mount. It’s not the most powerful and can be a little noisy in high winds, but it’s very good value as you don’t need to spend money and time installing an external charge controller.

Verdict: Easy to assemble, mount and operate, but noisier and less powerful than some

ecopowershop.com

ECLECTIC ENERGY D400 £1,350

Although it’s fairly straightforward to assemble, it’s not made any easier by the sheer weight of the generator.

During previous trials it proved to be one of the quietest on test, started quickly and outputting an increasingly progressive rate of charge. It is also less prone to yaw from side to side than some, keeping head into wind to ensure a more stable output.

Provided its mounting can handle the loads, its sturdy build allows it to continue operating in very high winds, producing a staggering 50A+.

Verdict: Solidly engineered, very powerful and quiet. The flip side is it’s heavy and needs dump resistors

eclectic-energy.co.uk

LEADING EDGE LE-300 £649.95

The device is easy to assemble and light enough to carry in one hand. An integral rectifier produces a two-wire DC output and its efficiency has recently been improved with the fitting of stainless steel counterweights to offset the effects of pitching and yawing common on a yacht.

A run/stop switch is supplied that brakes the turbine by shorting its output. It can also be supplied with a dump load style regulator to prevent overcharging (£189.95).

The LE-300 is probably the quietest of all the three-blade models available, but it’s also one of the least powerful.

Verdict: Light and great value, but with a lower output than many of the others

leturbines.com

LEADING EDGE LE-450 £899.95

The alternator uses rare earth fixed magnets and has zero ‘cogging’, allowing the turbine to start quickly and to spin in the lightest of breezes. Furthermore, having five blades of advanced design allows the swing radius to be kept to a minimum and reduces wind noise noticeably, while its light weight allows it to be safely mounted on a mizzen mast or possibly even a stout spreader.

Verdict: Well designed, lightweight and good value, but needs manual tethering in over 35kt of wind

RUTLAND 914i £649.96

An optional multi-stage charge regulator is available, which has an on/off switch and LED charge status indictors. It can also accept and integrate solar panels up to 160W.

The surprisingly cheap HRSi regulator (£78.50) works electronically to gradually slow the turbine in high winds or near full charge situations, rather than using resistive dump loads.

The 914 is quiet in operation and quick to start generating in light winds. Well made, its heavy metal hub acts as a flywheel, giving it enough momentum to smooth out the pauses during brief lulls in the wind.

Verdict: Quiet and inexpensive, with a smart controller. Relatively low output

marlec.co.uk

RUTLAND 1200 £1,195.00

High rotation speeds and efficient alternator design results in plenty of raw power. Marlec’s latest smart HRDi charge controller (£155.95) continuously alters the rotation speed of the generator, slowing it down as the batteries become more charged. It also incorporates the latest Maximum Power Point Tracking (MPPT) technology to optimise all the available energy produced and Pulse Width Modulation (PWM), which enables multi-stage charging to keep the batteries topped up. Other features include dual-battery bank control, an input for up to 250W of solar panels and an optional remote digital display.

Verdict: Powerful, well-made and with smart regulation. Has a wide rotation diameter

SILENTWIND 400 £1,291.33

The Silentwind is heavier than it first looks, mainly due to its high output, permanent magnet 420W alternator. Recent (2016) upgrades include a boost feature in the generator and a lower start speed thanks to its ‘low cogging’ design.

Available in 12V, 24V and 48V versions, its three-wire AC output connects directly to a recently upgraded smart charge controller with solar inputs, an LCD display, integral brake switch and Bluetooth connectivity so the user can monitor their battery status and charge from a mobile device or laptop. Furthermore, the new controller (£410.42) now consumes only 20mA itself, rather than the 100mA of the old model.

Verdict:   High power output and a nifty Bluetooth smart controller, but all at a price

technicalmarinesupplies.co.uk

SUPERWIND 350 £1,528.75

The SCR Marine charge controller option (£384) has two independent outputs, for start and service banks, although it does rely on the rather crude method of dumping any excess loads to two large resistors, which can get very hot if the device is left running in a gale.

Despite having a slightly lower output alternator than some, in field tests this device gave a very respectable performance in wind up to 15 knots, and provided serious amps in higher winds up to 28 knots.

Verdict: Light, well made, quiet and powerful, but expensive and reliant on dump load regulation

mactramarine.co.uk

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Wind Turbines For Boats (A guide for seafarers)

If you’re a sailor or boat owner, you know how important it is to keep your batteries charged. But did you know that you can use sustainable energy to power your boat? In fact, you can harness the wind’s kinetic energy with wind turbines for boats.

Humans have been harnessing the wind for thousands of years. Early seafarers have used this wind to power their boats, getting as far as Australia!

But with modern technology, you can now use this kinetic energy to power your boat’s batteries!

We cover everything you need to know in this guide on wind turbines for boats. We look at the type of turbine you need, calculate the required energy, and the costs involved.

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Table of Contents

Can A Wind Turbine Power A Boat?

With advances in alternative power technology, boats have started taking advantage of solar and wind energy.

By installing a small turbine onto your vessel, you’ll be able to charge your batteries as long as there’s wind. 

However, this doesn’t mean you’ll be able to power your whole boat. Sure, you’ll be able to harness some kinetic energy from the wind, it might not be enough. 

There are a lot of appliances and crucial instruments on board that need power.

Ideally, wind turbines can power your average sailboat boat, but a couple of factors could affect this. 

Some of these influences are:

• The wind resources available in your cruising area:  windspeeds along a coastline differ from windspeeds on a lake.
• Turbine placement:  the higher you mount a turbine on a boat, the more electricity it’ll generate.
• How often you use your boat:  you’re more likely to experience higher wind speeds while sailing than in the harbor. 

Regardless, a wind turbine for boats is handy to install, even if it’s just for that extra boost. 

What Size Wind Turbine Does My Boat Need?

Your energy requirements will determine the size of your boat’s wind turbine.

For example, if you’re going for a fun and relaxed trip, you’ll only need power for your electronics. Conversely, if you’re going fishing or trolling, you’ll need a more extensive battery system. 

Understanding The Math Of Wind Turbines For Boats

Calculating a power turbine’s energy output can be a little confusing; let’s go through the math to understand everything better. 

This formula works out each electronics power demand and, ultimately, your boat’s power demand. 

Power (W) = Voltage (V) x Current (A)

The next thing to remember is that each device has a runtime — while the device is running, it uses power (watts). The number of watts something uses in an hour is called watt-hours. For example, an appliance rated 500 W will use 500 Wh of energy in an hour. 

The same appliance rated 500 W will use 1000 Wh in two hours — this is the same as 1 kilowatt. 

Amperes – or amps for short – is a unit of measurement of electric current. They’re also used to indicate the capacity of your battery. 

Energy (Wh) = Voltage (V) x Capacity (Amp-hours or Ah)

For example, a 12 V, 100 Ah battery will give you 1200Wh

Wh = 12V x 100Ah ∴ Wh = 1200

That means your battery can give off 1.2 kW of energy per hour. 

How Much Power Does Your Boat Use? 

The size of your battery will determine what size your wind turbine you’ll need. For example, a wind turbine that generates 400 watts can charge an 800 Ah battery for a day on a 12-volt system . 

The average 45-foot sailing boat uses 150 amp-hours per day. However, your battery bank needs to be at least double or triple the size, so it doesn’t deplete. For example, a 450 Ah capacity battery in a 12V system would require 5.4 kWh per day. Can a wind turbine generate that much power?

As we’ll see later in this article, the average wind turbine has a max of 0.42 kWh. So on paper, that’s 10 kWh per day. However, in reality, it’s much different.

You see, the 0.42kWh is only guaranteed when you’re facing 20-knot winds all the time. Unfortunately, that’s not possible – at least for most of us. 

In fact, according to Betz law , your wind turbine will only generate 59% of its actual capacity. Taking that into account, let’s see if a 420 W wind turbine will still power our example boat: 

0.59 x 10 kWh = 5.9 kWh

That’s just over the amount your battery can handle. 

Which Boat Wind Turbine Is Suitable For You?

To determine which turbine is suitable for you, you’ll have to calculate the power demand of your boat. You’ll multiply the amps per device by its runtime to do this. For example, Autopilot uses 4 amps, and you use it for 12 hours — that’s 48 Ah. 

Based on this seafarer’s measurements, here’s a general look at how much power a vessel uses: 

If this sounds right for your boat, you’ll need 138.8 Ah during the day and 117.3 Ah at night — that’s around 256.1 Ah per day. 

Additionally, we’ll need to know the kWh to determine the turbine size. Using the calculation above, we can calculate that the required energy is 3073.2 Wh which is 3.07 kWh. 

To ensure that your battery doesn’t deplete, let’s double the required energy, which now equals 6.14 kWh.

In conclusion, you’ll need a turbine that generates 6.14 kWh per day. 

How Much Can The Average Wind Turbines For Boats Generate?

Due to external factors, your turbine will only generate 59% of its capacity. For instance, the average turbine can produce 0.42 kW at 20-knot winds. However, it’s more likely that your average recreational sailboat will experience 12-knot winds. 

At 12 knots, the average turbine generates 53 watts, equal to 1.2 Kwh per day. Unfortunately, 59% of that is only 0.75 kWh. That’s nowhere near the required amount.

Perhaps you’ll find that this amount of energy will power your boat. If not, hopefully, it can at least power your fridge, GPS, lights, and freshwater pump.

How Much Do Boat Wind Turbines Cost?

That was a lot to get through, but the hard part is over.

Now that you know your turbine requirements’ wattage, you can start looking at prices.

Off the bat, the average turbine will cost $1446 and can generate a maximum of 885 watts. But, of course, this is the maximum wattage, and you’re unlikely to reach this capacity.

Here’s a table of turbines that compares the wattage to price:

Surprisingly, the most cost-efficient turbines are the ones with higher wattage. Therefore, you can say that forking out the extra money for a higher wattage turbine is worth the investment.

Where Is The Best Place To Install A Wind Turbine On A Boat?

Wind turbines for boats are most efficient when facing directly into the wind. Any swaying or rocking will cause the turbine to turn away from the wind, decreasing efficiency. As such, it’s best to place the turbine near sea level or above the cockpit.

The Higher It’s Placed

Did you know that placing the turbine higher will increase its production rate? In fact, setting the turbine on the masthead can increase its efficiency by 50% . However, putting the heavy machinery that high can disrupt your vessel’s stability. 

In addition, the pendulum effect of the boat is more intense at that height, decreasing the turbine’s efficiency. 

Near Cockpit Level

However, placing the turbine just above the cockpit is a good option and here’s why:

• Having the turbine above the cockpit allows for easy access, making maintenance easier. 
• While the wind speeds are slower at this level, the turbine will be more stable.
• The distance between the turbine and the battery bank is smaller. This means you can run smaller cables between the two. 
• You won’t have to worry about voltage drop due to the short transfer distance.

The Downside

Having a spinning rotor and blades near you can be dangerous, especially in high winds. Just keep an eye out for the ‘sweep’ area of the blades and ensure the turbine is positioned high enough. 

How Much kWh Can A Boat Wind Turbine Produce?

‘How much’ is always tricky as multiple factors are involved. For instance, there are different wind speeds according to where you sail. However, most manufacturers say that their turbines have a max of 0.42kWh. 

To understand this better, let’s look at three different turbine models and compare their stats. 

The Silentwind turbine has a maximum output of 420w at a wind speed of 25 knots (28 mph). However, most boats will only experience a max of 20 kt (23 mph). At this wind speed, Silentwind can generate up to 140w. 

In addition, the turbine has a cut-in speed of 6.2 kt. (7 mph). However, common wind conditions of 12 kt. (13.8 mph) will generate 45w. 

The Silentwind turbine sells for $2,069 with the option of a mast-connector kit for $420. 

Rutland 914i Windcharger

The Rutland promises a 30% efficiency increase due to its maximum power point tracking (MPPT). It has a maximum output of 450w at a wind speed of 28 kt (32 mph) and a cut-in speed of 4 kt (4.6 mph)

At 20 knots wind, it generates 255w, and at 12 knots, it drops down to 60w. You can buy the Rutland for $729.95 and view its brochure here . 

Nature Power wind generator 

Nature Power offers a turbine that generates 500w, making it a good option for larger boats. It has a maximum wind speed of 24 kt (27 mph) and a 6.1 kt (7 mph) cut-in speed. 

Additionally, it ranges from 55w to 280w between 12 kt and 20 kt wind speeds. 

The turbine goes for $534 and includes an internal MPPT regulator.

Comparison Table Of Wind Turbines For Boats

Let’s put those in a table to compare the figures. Something to keep in mind is that 400w is about 800 amp-hours per day on a 12V system. 

Are Wind Turbines Better Than Solar Panels On A Boat?

Wind turbines and solar panels are great options to install on a boat. However, which is better? Their price and efficiency can determine this.

Cost Comparisons Between Solar Panels And Wind Turbines For Boats

When comparing costs, the number of watts generated is vital. For example, a solar panel might generate the same wattage as two turbines. 

You’ll have to do some research and calculations to determine your boat’s energy needs. By doing so, you can calculate how many solar panels/wind turbines you would need. 

In addition, the price of solar panels and wind turbines will depend on your location. But, a quick comparison puts wind turbines for boats in a higher price bracket than solar panels. 

Solar Panels cost anywhere between $400 and $1200. In contrast, most wind turbines fall in an $1100 to $1800 price bracket. 

Efficiency Comparison 

Both solar panels and wind turbines come with their advantages and disadvantages. These affect the efficiency and energy output of your boat. 

The most significant difference is that solar panels won’t generate power at night or on cloudy days. On the other hand, wind turbines can generate power 24/7. In addition, since they have low cut-in speeds, the turbines will continuously generate power as long as there’s wind. 

However, solar panels have a lifespan of 25 years, while wind turbines for boats only last 20 years. It’s also important to note that solar panels don’t need a lot of maintenance, whereas wind turbines do. 

Lastly, solar panels tend to generate more power than wind turbines. Depending on your sailing needs, you might prefer solar panels to wind turbines or vice versa. So at the end of the day, the choice is yours. 

Final Thoughts

And there you have it, a complete guide to wind turbines for boats!

We’ve looked at calculating the energy requirements of your boat and how to match that with turbines. Additionally, we compared different turbine costs and kW outputs. Lastly, we looked at three different types of marine turbines which you can use.

In conclusion, wind turbines are exceptionally efficient for smaller sailboats or recreational boats. However, wind turbines can also work if you have a larger boat and are just looking for an extra boost.

We suggest a hybrid solar panels and wind turbines system for larger boats with high energy demands.

If you have any questions or want to share your projects, we encourage you to join our community !

Tags: wind turbines for boats

Kyle is a researcher and content specialist at Climatebiz. He has a strong interest in green technology, particularly in photovoltaic systems. Kyle believes in a future where everyone has affordable access to renewable energy, regardless of their race, religion, or social status. This ideology led Kyle to found Climatebiz - with the goal to provide free information for anyone, anytime. You can follow Kyle on Twitter at @kylebrwng

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I have a wind generator on my boat + solar panels. I wish to buy the electrical device that shares and supplies the power to the boat batteries (the charger) that can work with both sources (generator + s. panel) . Where can I find it – and what are your recomendations?

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Marine Wind Generator Test

Practical sailors search for the best marine wind generator for cruising sailors unearthed two new units that will give the old guard a run for their money. the german-made superwind 350 and a lightweight prototype of the air breeze from southwest windpower, churned out maximum amps during four days of micro-wind turbine test..

The micro-wind turbines assembled for this comparison include the KISS High Output Wind Generator, the Rutland 913, the Superwind 350, the Ampair 100, and a prototype of the Air Breeze. The four-day test period brought a good mix of light- and strong-wind days, so testers were able to review wind generator output in a variety of conditions. Wind speeds for the 4-day period averaged 12.6 knots, with two blustery days, so were not surprised the high-output, three-bladed wind generators topped the five-bladed ones overall.

                                                    ****

Last month, Part One of Practical Sailor s wind generator test “Choosing a Wind Generator,” examined the various types of marine wind generators on the market today, and discussed what to consider before buying one. That article also previewed some of the key differences between the five wind generators we tested in March on the shores of Chesapeake Bay. This article examines these generators in more detail and presents the results of our field test, which tracked wind speed and output of the five wind generators over the course of four consecutive 24-hour periods.

The turbines assembled for this comparison include the KISS High Output Wind Generator, the Rutland 913, the Superwind 350, the Ampair 100, and a prototype of the Air Breeze. (A sixth unit, the three-bladed Ampair 300, looked promising, but failed on the first day of testing. It has been repaired, and PS will be reviewing it in a future issue.)

The tested units fall into one of two distinct categories: three-bladed wind generators with large-diameter rotors and high maximum outputs (Superwind, KISS, and Air Breeze) and six-bladed wind generators with small-diameter rotors and lower maximum outputs (Ampair 100 and Rutland). As pointed out in last months article, there are key differences between these types of turbines. The six-bladed units generally begin generating power in less wind and run quieter. The three-bladed units deliver significantly more amps as wind speed increases.

Wind generator makers Hamilton Ferris and Four Winds Enterprises were asked to provide products for the comparison, but neither could meet the deadline for the test. We have looked at units from these manufacturers before. The Hamilton Ferris hybrid water/wind was reviewed in our Feb. 15, 2003 issue. The earlier version of the Four Winds II was among several units compared during long-term testing in 1994 and 1995 .

The long-term test (Nov. 15, 1995) evaluated several different wind generators, one at a time, over several weeks and monitored output. Ultimately, Practical Sailor concluded that although wind generators are effective at producing high output in ideal conditions, their output in the winds you can expect in a comfortable harbor is less than stellar when averaged over the long haul. Only one generator in that test, the Wind Baron Neo Plus (no longer available, as far as we know) delivered more than 100 amp hours over 24 hours, and none had an average daily output greater than 10 amp hours, which is less than can be expected from one 80-watt solar panel on a moderately sunny day. Until this year, one obvious question remained unanswered, however: How would various micro turbines fare if exposed to the same variable winds in the same location for a fixed period of time?

Air Breeze (prototype)

Southwest Windpower, makers of the popular AirX Marine line of wind generators, supplied us with a prototype of the Air Breeze, which will soon be sold through West Marine. The unit we tested was essentially the new Air Breeze software and blades housed in an AirX body. Note that

Practical Sailor is withholding any final judgment on the Air Breeze, until we are able to test the final product.

The specs for our tested model were not readily available, but testers were told that they closely mirror that of the production Air Breeze, described here. The Air Breeze will be available in 12-, 24-, or 48-volt DC models and has a rated power of 200 watts at 19 knots. It uses a three-phase, brushless permanent magnet alternator, which produces AC power that is internally rectified to DC.

Turbine control is via a microprocessor-based smart internal regulator utilizing peak power tracking. However, the Air Breeze also has an internal voltage regulator with a factory set point of 14.1 volts (12-volt turbine) or 28.2 volts (24-volt system). The set point is also field adjustable to suit different charging regimes (an AGM battery, for example). This setup allows the unit to self-regulate in high winds and to automatically stop when the batteries are charged. Normal charging resumes when the battery voltage drops slightly below the fully charged level.

The body of the prototype unit (as well as the Air Breeze) was powder-coated cast aluminum. Construction of the prototype unit was excellent. Like the AirX before it, the Air Breeze has a distinct, downward pointing tail fin with a small cutout. The manufacturer says this allows for better tracking of the wind and better stability in rough seas. Oddly, testers noted this unit had more of a tendency to rotate briefly away from the wind, even in a steady breeze, but this seeking didnt keep it from producing the second highest total output in our test.

The Air Breeze was by far the easiest unit to mount in our test. The base simply slides on and clamps to a 1-inch diameter schedule 40 pipe, providing 360 degrees of continuous operation. The blades were constructed of glass-filled polypropylene. The maker says an improved rotor and blades will be on the production model.

Start-up speed is reported as 6 knots, while maximum or “survival speed” is listed as 96 knots, with over-speed protection provided automatically by electronic torque control, and manually by an optional stop switch. The Air Breeze also uses stall control of the blades. According to the makers, this function is much quieter than it was in previous models (such as the AirX and 403), since the stall mode is activated by the controller before the flutter RPM is reached. The result is a dramatic reduction in RPM in wind speeds above 30 knots, reduced wear on blades and bearings in high winds, and&emdash;most importantly&emdash;protection of the turbine from damage due to high winds. Stall mode is activated at about 19 knots, and will stay in effect until wind speed drops below 19 knots. If the Air Breeze senses wind speeds above 43 knots, it will shut down completely for five minutes.

The Air Breeze finished less than 6 amp hours behind the best recorded output for each 24-hour period.

Bottom Line:

Pluses for the Air Breeze prototype include high output (second overall), light weight (lightest overall), quiet operation, easy installation, excellent construction, and a low price. The unit will soon be available at West Marine for $915, according to the manufacturer. Testers also liked the charge LED display on the bottom of the unit, which gives a visual indication of unit output and can be used as a troubleshooting aid.

The Air Breezes downside is its limited field repair options, unless there have been significant changes from the AirX unit it replaces.

One of two small-rotor units tested was the Ampair 100 manufactured by Boost Energy Systems of Berkshire, U.K. A six-bladed unit, the Ampair 100 has a maximum output of 100 watts and produces AC, which is then converted to 12- or 24-volt DC (selected at time of order) by two bridge rectifiers located in the units lower body. The DC output of the regulators is paralleled and passed to two carbon brushes (also mounted in the lower body) and then to two phosphor-bronze slip rings (mounted on the stationary pivot shaft) allowing the unit to follow the wind 360 degrees without the use of commutator brushes. According to the manual, maximum output current automatically remains at a safe level due to self-inductance of the heavy-duty windings&emdash;it goes on to say that similar sized machines (with low inductance and light-duty windings) have to be protected against burnout by the use of temperature-activated cut-out switches.

The Ampair 100 is built like a tank. The unit consists of a painted, two-part cast aluminum body with attached aluminum tail vane. Fit and finish were excellent, and all other inspected external components were either stainless steel or of composite construction. Internally, there are two six-pole permanent magnet rotors (with poles in line) mounted on a stainless-steel shaft, which runs in two sealed, grease-packed ball bearings. Two six-pole stators (one located in the main body casting, the other in the nose cone) are arranged with their poles staggered at 30 degrees to minimize “cogging,” which can prevent a rotor from starting in light winds.

Although the Ampair 100 produces AC, its bridge rectifiers are located within the unit base (eliminating the need for a separate box), so installation is essentially the same as a unit that produces direct DC. If a blade is damaged, it and its opposing mate will have to be replaced together. However, you can run the unit (at reduced performance) with two blades removed until you get your replacements.

Start-up speed for the Ampair 100 is approximately 7 knots, and while the maker designates no maximum wind speed (only that its designed to survive storms), its manual does state that its a good plan to secure the unit if a severe storm is expected. There is a stop switch option. Without this switch, securing the unit involves these steps: grab the tail fin, swing the unit out of the wind, wait for it to stall, then secure the blades with a rope or bungee cord. The Ampair has a hole in the tail fin so users can grab it with a boat hook or an attached line.

The Ampair 100 is designed so it can be stripped in the field to replace damaged or worn components. The supporting literature is the best of the group&emdash;a well-illustrated manual, exploded views with part numbers, a troubleshooting guide, as well as a suggested list of spare parts for cruising in remote locations.

The Amp Air finished last after each 24-hour test period.

Compared with the entire test group (large- and small-rotor units), the Ampair was very well-constructed and exceptionally quiet. Compared to its nearest competitor, the Rutland, the Ampairs heavier construction and the ability to repair problems in the field give it a slight edge for those cruising in more remote locations. Its downsides are its output (the lowest of all the units tested) and its weight (the heaviest of all units tested).

KISS High Output

Manufactured in Trinidad by KISS Energy Systems and distributed in the U.S. by Hotwire Enterprises, the KISS High Output wind generator is a large-rotor, three-blade unit designed with Caribbean cruisers in mind. The name being an acronym for keeping things simple, the KISS generator uses a low-key, yet effective design to produce a unit that is not only rugged, but also easily serviced “in the wild” with parts readily available throughout the world. Its three-year warranty allows for authorized repair by another facility while youre out cruising.

Available in 12-, 24-, and 32-volt models, the KISS generates AC that is converted to DC by a 30-amp automotive diode pack and then fed directly to the ships electrical system. It uses a brushless, three-phase alternator. As mentioned in our first wind generator article, one advantage to this approach is that theres less voltage drop in AC wiring than in DC, a plus for installations with longer wire runs (such as a mizzen mast installation).

The KISS can be shut down via the provided on-off switch and is also protected from overheating by two thermal-sensitive bimetallic circuit breakers connected to the coils of the stator.

While not as finely finished as the other units tested, the KISS is nonetheless well constructed and pretty much bulletproof. It uses a sealed fiberglass motor housing and weighs only 17 pounds (plus 13 feet of wire at about 6 pounds), making it the second lightest unit we tested. The motor fits directly into its two-piece fiberglass housing, which is bolted together (through the motor) with four stainless-steel bolts and sealed with silicone. (An oil seal on the motor shaft provides additional weatherproofing.)

Other features include an alternator designed specifically to match the low speed characteristics of the rotor blades, epoxy-coated neodymium iron-boron magnets and plastic sealed No. 6203 metric ball bearings (commonly available worldwide) which, as per the manual “ensures that maintenance will be infrequent, simple, and inexpensive.”

The KISS essentially comes in two parts: the generator body and rotor (which the blades are bolted to). The blades are highly cambered with twist, taper, and elliptical tips for maximum torque at relatively low RPMs and reduced blade noise. Each blade is made of five layers of bi-axial glass roving, pressure molded in polyester for strength with minimal flex and very light weight. All three blades are bolted to the rotor, which screws onto the threaded motor shaft.

The three blades are selected at the factory to have similar dynamic weights, however final balancing by the customer is required once installed on the rotor. This is a straightforward process accomplished by trimming a strip of lead tape attached to each blade. The reason given for having the customer balance the blades was so they would be better balanced upon assembly (after shipping). If you don’t want the hassle, Hotwire Enterprises will pre-balance the blades for an additional $25.

As the blades are sold as sets (based on similar weights), the company recommends replacement of all three ($210) should a single blade be damaged. However, you can keep undamaged blades as emergency spares, balancing them with the spare lead tape provided.

The KISS is the only unit tested that did not use some form of rotary contact (a feature that allows multiple, 360-degree rotations). Instead, the unit comes with a tether connecting the tailfin to the mounting post, allowing the unit to turn no more than three revolutions in either direction. The manufacturer states that its rare that the unit will turn 360 degrees. A light spring installed in the mount tends to turn the unit back to the forward position when the wind stops. Optional mercury-contact slip-rings providing infinite 360-degree operation are available from Hotwire for an additional $200.

Start-up speed for the unit we tested was advertised at 7 to 8 knots, and while the KISS is guaranteed to hurricane winds, thermostats in the motor will begin cutting output at around 20 to 25 knots to prevent overheating. The KISS produced noticeably less power than the other three-blade units on the windy Days 2 and 4. The manual states that youll probably want to shut the unit down above 25 knots. This can be accomplished by utilizing the electric stop switch mounted in the control box.

The stop switch will slow the blades to a near stop in winds up to 42 knots (allowing you to secure the blades with a line). You can also manually shut down the unit using the line from its the tail to swing the tail into the wind. The KISS does not use set screws to attach the hub to the shaft, so its very easy to remove the blade assembly and stow below for hurricane preparation. The housing itself presents little windage. The KISS banked the most amp hours on Day 1, and was the only generator that did not record its highest output on Day 4.

The strong points of the KISS include simple, robust construction, excellent output for the tradewind cruising for which it was designed, and last&emdash;but certainly not least&emdash;the ability for the owner to repair virtually all aspects of the unit in the field. Downsides include slightly higher noise levels, the requirement for the customer to balance the blades (not due to difficulty, but as an additional step and potential problem if done incorrectly), and lower overall output than the other large diameter units tested.

Rutland 913

The Rutland 913 is the second six-bladed, small-rotor, wind generator featured in our test. Output of the Rutland 913 is 12 volts DC, and it is manufacturer-rated to deliver up to 250 watts. It is designed to provide power (via a battery or bank of batteries) to 12-volt or 24-volt systems. At $995, it is the least expensive production model we tested.

The Rutland 913 features all marine-grade materials and stainless-steel fittings. Highlights include a high-inertia generator, stator windings developed without an iron core (for low friction and low start-up speed), fiberglass encapsulated stator coils for reduced stator failures, and dual-encapsulated single magnets (eliminating the need for multiple, glued into place magnets).

The Rutland also features automatic thermostat protection (for use during prolonged high winds) and a start-up speed of 5 knots&emdash;the lowest of all the units tested. A shut-off switch is available with the optional HRDX charge controller ($295). The standard HRS charge controller is $149.

The Rutland 913 was not as heavily built as the Ampair, but construction was of a high quality. The Rutland comes pre-assembled with the exception of the blades and nose cone, both of which were very easy to install. The six turbine blades are a glass-reinforced nylon composite.

If a blade is broken, it should be replaced along with the opposing blade to maintain balance. However, until replacements are installed, the 913 can still be operated by removing every other blade, so that it is still in balance.

The Rutland manual doesn’t list a maximum operating wind speed. It does mention that higher winds may trigger the units built-in thermostat to prevent the generator from overheating. If it does, output stops, and the turbine will temporarily speed up until the units internal temperature drops back down to normal, after which it starts charging again. The manual indicates you may see this cycling in prolonged winds (particularly in higher ambient temperatures), and that if storm winds are forecast, you may want to secure the unit to minimize wear and tear.

The 913 “is designed for continuous running to achieve maximum resistance to water ingress,” and if restrained for any extended length of time, it should be covered.

The Rutland 913 does not have a stop-switch option. Stopping is essentially the same procedure as with any wind generator without a braking option: Grab the tail, swing the unit out of the wind (180 degrees), and once the unit stalls, throw a rope around a blade or two and tie to the mounting pole.

Theres a small hole in the lower lobe of the Rutlands tail assembly to make this operation a bit safer by allowing you to grab the tail with a boat hook. You can also install a small tagline through the same hole to make it safer to grab whenever you need to secure the unit&emdash;just be sure it wont tangle in the blades.

The Rutland 913 was the quietest unit in our test group, having a slight edge over the Ampair 100, its closest competitor noise-wise. (Not surprisingly, the two small-rotor units were the quietest of the group). The Rutland was well-constructed, had the lowest start-up speed and the quietest operation. Compared to the other small-rotor unit, the Ampair 100, it produced more and was quieter (although only slightly so). The decision between these two boils down to the Ampairs rugged construction and repairability versus the Rutlands slightly better performance.

The Rutland 913 finished next to last on every day except when the wind was light on Day 3, when it was 0.5 amp hours behind the Superwind.

Superwind 350

The Superwind 350 is a three-bladed, large-rotor unit manufactured by Superwind GmbH located in Bruhl, Germany, who recently signed on U.S. distributor Starboard Sun Corp. of Amherst, N.Y. ( www.starboardsun.com ).

The Superwind is a 350-watt unit that produces DC current and is available in 12- or 24-volt output. Similar to what youd see in larger wind turbines, the Superwinds rotor control system adjusts the pitch angle of the blades for power and for limiting rotor speed, even during extreme wind velocities. In winds over 24 knots, the rotor control system adjusts blade pitch to keep power output constant.

The Superwinds fit and finish were excellent. The generator body, rotor, and tail assembly are powder-coated “sea water-proof aluminum.” Total weight for the assembled unit is approximately 25 pounds. Features include a no-maintenance, permanent magnet design incorporating neodymium magnets in a three-phase generator with an internal rectifier. The Superwind comes with a three-year warranty on parts and workmanship, however, it does have some basic exclusions, such as floods, lightning strikes, fire, etc.

The Superwind is delivered in three easily assembled parts: the generator body, rotor (which the blades are attached to), and the tail, or wind vane. Each carbon fiber-reinforced blade is mounted to the rotor using two flush-mounted, stainless-steel Allen head screws. The blades come balanced from the factory, meaning if one blade is damaged, youll have to replace all three at a cost of about $250, plus shipping. It was the most difficult to install, requiring that you measure, drill, and tap two metric holes in the schedule 40, 1 1/2-inch tube to accept the mounting bolts. An optional adaptor for mounting on 2-inch diameter steel or aluminum pipe is also available.

The Superwind produces DC, so the electrical installation is pretty straightforward and well-documented in the manual. Due to high power output, installation of a battery charge controller and a stop switch is highly recommended. Superwind sells its own controller for $480 and a stop switch for $89.

The Superwind manual has a basic troubleshooting flow chart, but if its anything more complicated than replacing damaged blades, swapping out the carbon brushes or checking for blown fuses, youll likely have to send the unit for repair.

The Superwind edged out the Air Breeze with overall output, and was the top performer in every period, except the first, when it recorded the second lowest output total.

The Superwind was the overall winner with regards to putting amp hours in the proverbial battery bank. It was very well constructed, relatively quiet for a large-rotor unit, and performed well, even on the lowest wind day (relative to the other models). Its downsides include limited field repair options, a hefty price tag, and the fact that it is a newcomer to the U.S. market.

Clearly, we are looking at two different animals here: quiet, lower-output, five-bladed units that deliver power on most days when theres a breeze; and three-bladed units that can bank some serious amp hours when the wind is up. Although the test period was relatively short, it brought a good mix of light- and strong-wind days, so testers were able to monitor output in a variety of conditions. Although isolating each period is instructive, the final average for the four days is, in our view, the most useful number.

Wind speed for the 4-day period averaged 12.6 knots, with two blustery days, so were not surprised the high-output, three-bladed wind generators topped the five-bladed ones overall.

The Superwind did the best on every day, except Day 1, when winds mostly hovered around 10-12 knots. Most striking was the Superwinds superior performance on the mostly light-wind Day 3. More importantly, Superwind was a robustly built unit that ran quietly while it went to work. It is also the second heaviest unit and the most expensive by far.

If there is any concern we about the Superwind (besides the price), its that its new to the U.S. and only recently signed on with a distributor here. Wind generator makers have come and gone over the years, and we hope this one&emdash;started in 2004&emdash;sticks around.

The Air Breeze prototype looks very promising and might even have been the Best Choice, except that we have not tested the actual unit that will be for sale. If youre not in a hurry to buy, you should wait for our update on that model. The KISS, which climbed to the top on Day 1 and placed third in output overall, is our Budget Buy for high-output models, and would be well-suited for tradewind cruising. It suffered in winds less than 10 knots and was slightly noisier, but it is well built, and for DIY types, it is eminently serviceable.

Of the silent running, six-bladed wind generators, the Ampair gets a recommendation for serious cruisers who want “built-like-a-tank” construction, and repairability in the field. The Rutland 913 is our Budget Buy in the five-bladed category. Based on our testing, it is the most affordable route to quiet windpower and superior output in light wind conditions.

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Harnessing the Wind: Exploring Wind Generators for Sailboats

• November 24, 2023
• Written By Samuel Yang

What's on this page?

Introduction

Sailing, with its timeless connection to the wind, has always relied on nature’s forces to propel vessels across the seas. In the quest for sustainable and independent energy sources, many sailors consider wind generators as an option to power their sailboats. In this article, we’ll explore the viability of wind generators for sailboats, evaluating their potential to generate sufficient energy while navigating the open waters.

1. Understanding Wind Generators for Sailboats

Wind generators, also known as marine or wind turbines, are devices designed to convert wind energy into electrical power. They consist of blades attached to a rotor that spins when exposed to wind, driving an internal generator to produce electricity.

2. Factors Affecting Wind Generator Performance

Wind Speed and Consistency : The efficiency of a wind generator heavily relies on consistent and moderate to high wind speeds. Sailboats frequently traverse areas with varying wind patterns, impacting the continuous generation of energy.

Placement and Obstructions : Wind generators require unobstructed airflow to function optimally. On sailboats, masts, rigging, sails, and other structures may create turbulence or block wind flow, affecting the generator’s performance.

Power Output : The power output of a wind generator is proportional to its size and the wind speed it encounters. Compact marine turbines may have limitations in the amount of energy they can produce compared to larger land-based turbines.

3. Suitability for Sailboats

Energy Needs : Assessing the energy demands aboard a sailboat is crucial. Wind generators can contribute to charging batteries, running navigation systems, lights, and other low-power electronics. However, they might not generate enough power for high-demand devices like refrigeration or heavy appliances.

Sailing Conditions : Wind generators excel in open waters with consistent and moderate to high wind speeds. Coastal cruising or long passages with favorable wind conditions enhance their effectiveness.

4. Complementary Energy Sources

Sailboats often employ a combination of energy sources. In addition to wind generators, solar panels, hydro-generators, or fossil fuel-based charging systems may supplement energy production, ensuring a more reliable power supply.

5. Considerations for Sailors

Space and Mounting : Wind generators require suitable mounting space on sailboats. Their installation should consider the vessel’s size, weight distribution, and clearance from other structures.

Noise and Vibration : Some wind generators produce noise or vibration while in operation. Sailors may need to assess the impact of these factors on comfort and functionality during sailing.

Wind generators offer an enticing prospect for sailors seeking renewable energy sources to power their sailboats. However, their effectiveness depends on various factors, including wind conditions, vessel size, energy demands, and navigational routes. While wind generators contribute to sustainable energy on the open seas, their capacity to meet all energy needs on a sailboat may vary. For sailors embracing the synergy of nature and technology, evaluating the practicality and potential limitations of wind generators becomes essential in shaping an energy-efficient and eco-friendly sailing experience. If you are interested in investing in a greener sailboat, come check out our marine wind turbine today!

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Receive the latest news, samuel yang.

Samuel is a knowledgeable leader and an avid user of all types of consumer electronics. With 6 years of experience in the field, spanning countries like the United States, France, and Taiwan, he has developed a passion for green energy and technology that helps improve lives. He enjoys traveling and scuba diving in his free time!

This Wind-Powered Super Sailboat Will Carry 7,000 Cars Across the Atlantic

The cargo ship of the future is coming.

Gear-obsessed editors choose every product we review. We may earn commission if you buy from a link. Why Trust Us?

• Traditional cargo ships are a requirement of the global economy and account for 2 percent of energy-related carbon emissions.
• This sailboat uses vertical "airplane wings" and an algorithm to continuously maximize speed.

A wind-powered super sailboat could change how we ship cargo, reducing energy-related carbon emissions in a method still used by 90 percent of manufactured goods . The Wallenius Marine OceanBird can carry 7,000 cars at a time and is powered totally by wind.

🚢 You like badass boats. So do we. Let's nerd out over them together.

Cargo ships are a gigantic worldwide business, and freight lines have already made changes to use fewer fossil fuels. That includes slowing down, because freight ships already take long, steady journeys that can absorb some extra lead time. But a wind-powered alternative could even eventually increase speeds without putting more demand on the global fossil fuel infrastructure.

OceanBird has five “sails” that are more like airplane wings or helicopter rotors, using rushing air at different speeds to pull the ship forward. For now, it can reach 10 nautical miles per hour, or knots, and will make the trip across the Atlantic Ocean in 12 days compared to eight in a fossil fuel cargo ship.

ScienceAlert reports on the smart and gigantic sails:

“The retractable wing sails stand 80 metres (262 feet) tall, and will be controlled by algorithms that calculate exactly how to make the most efficient use of wind power out on the ocean. An auxiliary engine, running on clean fuel, will be available as a backup and for getting in and out of harbours.”

So, like a Prius and other hybrids, the ship will use a fuel engine to get going and then the most efficient energy to cruise. In addition, the development team has made changes to the shape of the ship’s hull and added robust computing power that calculates the best possible configuration to harness the most speed at any give time.

What results is a sleeker, smarter ship design that the company says could also be used to improve cruise ships—a distant-feeling thought in 2020’s COVID-19 shutdown, but something that will eventually come back into play. Overall, Wallenius Marine says it has cut emissions by 90 percent.

While the global cargo shipping industry has taken a variety of steps to reduce its fossil fuel emissions, the sheer size of the industry and ongoing demand means it still makes up about 2 percent of all global emissions. The OceanBird is strictly in the design phase for now, with a fully realized design next year and earliest possible production in 2024.

Wallenius Marine wants to drum up interest now, but it also hopes sharing its ideas will encourage others in the space to continue to innovate. Goods will always need to circulate around the world, making cargo shipping an industry where even small changes can have a tangible and immediate impact.

The Best Solar Panels for Your Buck

160W Monocrystalline Solar Panel

If you aren't really sure where to start, this solar panel is a failsafe option. It's relatively budget-friendly (solar panels can get expensive fast ) and it performs. It's made of PET, EVA and monocrystalline silicon, and it's anti-reflective and high transparency. It's also easy to use and compact in size, making it easy to store when not needed. 

DOKIO Monocrystalline Foldable Solar Panel

If you live somewhere with low light, you might be worried that solar panels aren't for you, but these actually perform excellently in low light conditions. The high conversion efficiency 100 watt PV panel can charge 12v /24v batteries, and it comes with a portable folding suitcase. This one is easy to take on-the-go with you if you're camping, and easy to store if you're using it at home in case of a power outage. 

Renogy 300 Watt Monocrystalline Solar Panel

If you want to really go all out, you can't go wrong with Renology's 10-piece, 300-watt solar panels. They're capable of withstanding high winds and snow loads, they're anti-reflective, and extremely versatile. These are ideal for residential or commercial rooftops, but they're compatible with a ground-mount as well. 

Renogy 100 Watts 12 Volts Monocrystalline Solar Starter Kit

Anyone new to solar panels should start with a good kit, like this one by Renology. You'll get everything you need in one, including an 100W solar panel, 30A PWM negative ground charge controller, MC4 connectors, a 8Ft 10 AWG tray cable, and mounting Z brackets for an RV or boat. It can fully charge a 50Ah Battery from 50% in 3 hours.

Caroline Delbert is a writer, avid reader, and contributing editor at Pop Mech. She's also an enthusiast of just about everything. Her favorite topics include nuclear energy, cosmology, math of everyday things, and the philosophy of it all. 

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Cargo Ships Reclaim Wind Power With High Tech Rigid Sails

Canvas sails once powered the cargo ships that sailed the 7 seas, and now the modern day shipping industry is taking steps to reclaim its wind power heritage — with a high tech twist, that is. In the latest development, last week the French startup Zéphyr & Borée received validation for a new container ship decked out with 8 rigid sails engineered by the firm Computed Wing Sails.

This New Wind-Powered Ship Is No Small Potatoes

The new sails received approval in principle from the leading global certification firm Bureau Veritas, which has developed a new classification system for oceangoing wind propulsion systems .

BV certainly had its work cut out for it with the Zéphyr & Borée project. The ship is no demonstration-scale venture. It is a full sized, 185-meter (about 607 feet) cargo ship with a capacity of 1,800 TEU, which refers to the number of 20-foot containers it can hold.

That’s not nearly as big as the biggest cargo ships at sea today, which can easily top 20,000 TEU. However, it’s big enough to showcase how wind power can be scaled up to help decarbonize the global shipping industry.

High Tech Sails For More Wind Power

Zéphyr & Borée was founded in 2014 on a platform of shipping industry decarbonization , and it is casting a wide net in the wind power area.

The rigid wind power harvester designed by Computed Wing Sail is a thick, asymmetrical sail that resembles the wing of a glider. Depending on the wind conditions, it can fold down to hold a position half its height for optimal efficiency.

Zéphyr & Borée has also been working with the naval architecture firm VPLP, which has contributed its experience in designing rigid wing sails for racing yachts .

As described by Zéphyr & Borée, one challenge is to design a rigid sail that can be furled, meaning it can be folded into a more compact shape during rough weather.

The new sails also meet the challenge of minimizing crewing and training requirements.

“The control of the rigging does not require additional sailors, the settings are entirely automated and the structure meets the robustness and reliability imperatives required by maritime regulations and commercial ship activities,” Zéphyr & Borée explains.

How About Some Solar Power With Your Wind Power?

The idea of a rigid sail brings up the potential for adding on a layer of thin film solar panels. The Japanese firm Eco Marine Power introduced a patented rigid sail that doubled as as solar energy harvester back in 2011. Somewhere over the years, EMP separated the sails and the solar panels, which can be installed individually or as an integrated system.

By detaching the solar panels from the sails, EMP also gave the solar side more room to grow. EMP notes that its solar technology is lightweight and flexible, so it could be installed on awnings and other surfaces of a ship.

Earlier this year EMP received approval in principle from Nippon Kaiji Kyokai for its “Aquarius Marine Renewable Energy with EnergySail” solar and wind power combo.

EMP emphasizes that its clean power system can continue to generate electricity when the ship is at rest.  That’s a significant consideration in the context of the ongoing shipping bottleneck, which has left thousands of cargo ships waiting to dock while running their diesel engines.

New Shapes For Wind Power

Another interesting development to pop up is a cylindrical sail that resembles a smokestack, engineered by the firm Norsepower under the name Rotor Sail. The cylinder can be tilted down to allow for low bridges and other infrastructure, which opens up a broader array of shipping routes and destinations.

The Rotor Sail made its first appearance at CleanTechnica in 2015, when our friends over at Rocky Mountain Institute explained that the tubular design is an update of the Flettner rotor, a wind-powered device that spins within a cylinder.

“The rotor generates thrust for the same reason that a spinning baseball curves through the air after it’s thrown — the Magnus effect. When air moves across a rotating body, it exerts a force perpendicular to the direction of the air,” RMI explained.

All was quiet for a few years until 2019, when the tubular, tilt-able sails popped back onto the CleanTechnica radar in 2019. Norsepower has been awfully busy since then.

Among the recent developments is an agreement with the global mining and shipping giant Vale to outfit one of its “Valemax” Very Large Ore Carrier cargo ships with an array of 5 Rotor Sails .

Last month, Norsepower also signed a Memorandum of Understanding with the global maritime technology firm Kongsberg Maritime .

The new agreement adds wind power to KM’s growing portfolio of decarbonization solutions for the shipping industry.

Oskar Levander, SVP Business Concepts for KM, explains:

“This co-operation with Norsepower is an additional step towards KM’s ambition to become the leading integrator of green shipping technology, such as auxiliary wind power, alternative fuels/energy sources and energy saving devices…Together we will offer support to shipowners and shipyards looking for the most efficient and effective ways of applying Rotor Sail technology, and collaborate on new ship designs to integrate these technologies and improve energy efficiency overall.”

Onward & Upward For The Decarbonized Shipping Industry Of The Future

Of course, if people would just stop buying so much stuff from faraway places, there wouldn’t be nearly as much carbon emissions from the the shipping industry. However, that’s not going to happen. In fact, the whole industry is headed in the wrong direction.

According to the International Marine Organization, the global shipping industry (including fishing) has improved its carbon intensity in recent years. Nevertheless, the industry’s total greenhouse gas emissions are already 90% higher than the benchmark year of 2008 and they are projected to keeping increasing by up to 130% in 2050.

Meanwhile, IMO hopes to cut emissions back down to 2008 levels by 2050. It appears that wind power will be part of the solution, though only as a means of reducing fuel consumption. It’s difficult to imagine a Valemax ship of 360 meters and 400 tons dead weight powered exclusively by the wind, but using wind power to reduce carbon emissions from marine fuel can make a significant difference.

Norsepower confirmed a savings of more than 8% on fuel for its Rotor Sail back in 2018, and the company anticipates a savings of up to 25% under some conditions.

Battery-electric technology will also play a role. Though today’s batteries might not be up to propelling a full sized cargo ship, Yara has just launched a modestly sized electric ship in Norway that will amplify its own emissions savings by replacing thousands of truck trips annually on local roads.

Zero emission hydrogen fuel cells are emerging as another decarbonizing option, at least for ferries and other smaller watercraft, but only to the extent that the global supply of green hydrogen continues to grow (the primary source of hydrogen today is natural gas, but alternative sources are emerging).

For larger craft, shipping industry stakeholders are beginning to dip into the green hydrogen-ammonia field, in which renewable ammonia can be produced by combining renewable hydrogen with nitrogen from ambient air. That’s a huge sustainability step up from the current state of the ammonia supply chain, which leans heavily on natural gas.

There being no such thing as a free lunch, the shipping industry will have to do something about nitrogen oxide emissions from burning ammonia in a combustion system, so stay tuned for more on that.

Follow me on Twitter @TinaMCasey .

Image: Rigid sails provide wind power for cargo ship (courtesy of Computed Wing Sail ).

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Tina specializes in advanced energy technology, military sustainability, emerging materials, biofuels, ESG and related policy and political matters. Views expressed are her own. Follow her on LinkedIn, Threads, or Bluesky.

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MarineKinetix MK4+ Marine Wind Generator

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Product Description

The marine industry’s highest rated wind generator.

MarineKinetix MK4+Wind Generator, including Controller - For Lead Acid, AGM, Gel and Lithium Batteries. 

The marine wind generator with a 100% satisfaction guarantee, and the industry's best 3-year limited warranty.   

Double click on the large picture above to scroll through scores of pictures of fellow bluewater cruisers worldwide relying on power from their MarineKinetix wind generator.  See a recent blog from a seasoned bluewater cruiser and Salty Dawg Rally organizer who solved his large energy demands using a combination green energy, including an MK4+ wind generator  here .

The MarineKinetix Wind Turbine has become one of the most popular marine wind generators available due to its advanced technology, superior output, and  super-quiet design.  The MarineKinetix is now considered to be the benchmark among serious cruisers. With a 30% to 50% larger swept area than the most popular marine wind generators, it is simply capable of intercepting more of the available windstream, and capturing more power.  Its sophisticated charge controller displays all the data, including Amps, Watts and Volts, and assures that the power makes it safely and efficiently into your battery bank through a 2-stage smart charging process. No need to buy extra meters , rectifiers, stop switches, or load diverters.  These are integrated into our smart controller. Just add your mounting pole and the wiring to your batteries, and you are ready to start producing green energy.

We are celebrating our 10th year of serial production, and our 6th year producing our latest design, the MK4+ Marine Wind Generator. The MK4+ replaced the popular MarineKinetix MK450.   

The MK4+ includes the following upgrades:

• The Wind Generator body is smaller and even lighter than the original design.  This is accomplished with a shorter, but more upright tail, with a greater surface area, and lower polar moment, for faster, and truer wind-tracking.  This lowers yaw error and improves performance in shifting winds.
• Upgraded asymmetrical pole-shifted rotor with 12 (vs 10) neodymium rare-earth magnets for more power and zero cogging.  Bread-loaf magnet design for optimum air gap.
• Upgraded 36-slot stator with premium heavy-gauge copper windings.
• A new and improved anti-corrosion marine grade finish, which starts with a new high-pressure die-cast magnalium body, which is DACROMET pre-treated, then coated with a high-quality corrosion-resistant thermoset marine powder coating. No other marine wind generator uses this anti-corrosion process.
• New double yaw bearings.  Double bearings provide a larger "wheelbase" for the yaw joint, which reduces any free play, which can contribute to vibration and noise.
• Improved silicone o-rings which are totally weather-proof.
• Improved Aero'coustic 20% carbon-fiber filled injection molded blades, which are 18% more rigid than the previous design.
• All new Hybrid Wind/Solar Charge Controller with LCD display - with integrated battery monitor, stop switch, ammeter and watt meter. (no need for expensive monitoring panels).
• Patented 2-Stage PWM Charge Controller - Increases the efficiency of the charge cycle and tops up the batteries quicker and more fully.
• Improved high-precision hub, with tighter blade fastening tolerances, for perfect blade alignment and whisper-quiet operation.
• Improved molded urethane isolator pad, which fits between the pole and the collar.  Molded in "cap" allows it to stay put during assembly.

The great performance of the original MK450 remains.  The above changes are incremental improvements designed to improve start-up speed, ease assembly, resist corrosion, and improve real-world output. The MK4+ is truly a world-class micro wind generator.

Tired of talking to non-technical vendors that don't understand the nuts-and-bolts of what they are selling?  Give our technical rep, Jeff, a call directly at (864) 275-7837 to answer any questions. Read on to see what really matters when considering wind power for your boat.

Why Consider the MarineKinetix Wind System?

The MarineKinetix Wind Turbine System is simply one of the best performing small wind generator system available for marine use. That is quite a boast, considering all the small turbines out there with catchy names, and bigger advertising budgets, but read on to find out why we believe you'll soon agree.  

The MarineKinetix MK4+ is a simple to install, hands-off, super-quiet wind-energy production system made especially for the marine environment. This high-output, low start-up-speed system utilizes the best of European wind-science in its design. In addition to its leading-edge high-output dual-bearing 3-phase permanent magnet generator, it also features world-class aerodynamic efficiency with its carbon-filled aero'coustic rotor blades, which have been optimized for high torque, low rotational inertia, and exceptionally quiet output. These features, coupled with the included "hands-off" microprocessor-based charge-controller, and its exceptionally low yaw-error, make for what we think is the best marine wind generator system on the market. See why below.

The MarineKinetix MK4+ wind turbine system is a leap forward in wind turbine science. It makes the intelligent compromise between low-speed start-up and high-speed output, all at a realistic and cost-effective price.

• A complete 400 Watt Wind System (includes generator and controller)
• 1330mm Blade Diameter (1.3M) - Swept Area = 1.39 Meter
• Weighs only 17 lbs., about HALF the weight of certain competitive designs, without compromising performance thanks to a magnalium body, an asymmetrical rotor, and high-energy-density Nd2Fe14B rare-earth magnets 
• Lightweight 300g 20% Carbon Fiber Polymer Composite blades
• Available in 12V, 24V and 48V designs
• Compatible with VRLA, Gel, AGM, Lithium, and Lithium Iron Phosphate (LiFePO4)
• Industry Standard Mounting - Mounts to 1.5" Schedule 40 pipe (1,9"OD), or 48-50mm OD tubing
• Double marine thermoset powder-coat finish, over a DACROMET self-healing aluminum-zinc nano coat
• 5.8 knot start-up speed (begins producing power), 6.7 knot cut-in speed (begins charging 12V/24V batteries)
• Aero'coustic 20% Carbon Polymer Blades
• Super-silent - LAeq 35dB at 5M at 10 knots (about the same as a running fridge)
• Direct drive, 3-Phase dual-bearing AC permanent magnet synchronous generator
• Neodymium Iron Boron (Nd2Fe14B) permanent magnet synchronous design
• 12 pole rotor, with bread-loaf magnet profile, and asymmetrical pole-shifted magnet placement, for low cogging torque
• Automatic back-EMF braking at full charge (or 40 knots overspeed protection)
• IU PWM Charge Control Profile with hysteresis braking
• Microprocessor controlled auto set-point for AGM, Gel, VRLA, Flooded,  Lithium, and Lithium Iron Phosphate (LiFePO4)
• Requires no diode packs, diverters or external resistive loads
• Over-charge, over-current, and automatic over-speed protection
• Integrated heavy-duty yaw-axis slip-ring, allowing continued >360° limitless rotation
• Simple installation, and user-serviceable components
• Includes micro-processor charge controller with "at-a-glance" LCD charge, voltage, amperage and wattage status
• Fully compatible with existing solar installations (no conflict with other existing charging sources)
• 3-year limited warranty, and 30-day 100% satisfaction guarantee
• Full lifetime tech support by phone or email with purchase

What is included in the Wind Generator kit?

• MK4+ Wind Generator
• Smart Charge Controller with integrated performance monitor and stop switch
• Blades (x3) with SS blade mounting hardware
• Hub, with mounting nut 
• Snap-on molded plastic nose cone
• SS Hardware to mount clamping collar to your pole
• Silicone rubber isolator (goes between pole and collar)
• Assembly allen key tools
• Instructions

What accessories are available from Marinebeam?

• 50A Resettable Circuit Breaker
• Pole Mounting Hardware Kit
• 3-Piece Pole Mast 
• 10/3 Marine Cable
• Spare Parts

Details About the Unique Marine Kinetix Technology:

Our solution is a systems-approach to wind-energy production on-board. The MK4+ system couples several forward-thinking ideas into one "wind-system" which is easy to install, affordable, and maximizes energy production.  We did this by first starting with a low-friction, high-energy-density 3-phase rare-earth magnet rotor design, which came from concepts and materials used in leading-edge green-energy vehicle research. The Neodymium Iron Boron (Nd2Fe14B) permanent magnet rotor uses patented technology licensed from Sumitomo/Hitachi in Japan.  This is the same type of PM rotor design used in the AC synchronous motors in the Chevy Volt and other electric vehicles.   The rare-earth magnetic rotor is a key to its performance and low noise and vibration.  We now utilize an asymmetrical pole-shifted rotor design, which is a advanced method that replaces the heavy mass and cost of older skewed rotor designs, while providing the same advantage of reducing the cogging torque, and improving low speed performance.  We coupled this super-efficient machine with a biomimicry-inspired carbon-fiber-filled blade set, which makes for super-quiet performance while improving overall aerodynamic power.

The results are a turbine that outperforms others in start-up speed, output, and noise.  While other systems are idle, the MK4+ is generating. While other systems are disturbing the peace, the MK4+ is virtually silent. While other systems are struggling to charge, the MK4+ is topping off.

What are the important factors in wind energy production?

Physics dictates the basic performance of all wind generators.  In fact, the power available to any wind generator is a function of the square of the diameter (swept area of the blades) and the cube of the wind speed.  The ability of any specific wind generator to the capture wind efficiently depends on the length of its blades (its swept area) and its Tip Speed Ratio.   Tip Speed Ratio refers to the speed of the tips relative to the speed of the wind.  If the blades spin too fast relative to the wind, they begin to begin to look like a solid disk to the wind, and air piling up in front of the blades effectively blocks the wind behind it.  On the other hand, if the blades spin too slowly, much of the wind passes through the gaps between the blades, and the energy is lost forever.  So, swept area and blade design are the most important areas which the wind generator manufacturer can control.  While the MK4+'s blades are only 8 to 9 inches longer than the typical blade, they sweep as much as 40% more area than the competition.   With a nearly perfect tip speed ratio due to the computer-modeled and simulated blade design, and the impedance load-source matching of the controller, the MK4+ has a higher energy capture compared to most other designs. 

Because of the cube relationship of wind speed to power production, wind speed is absolutely the most important factor in wind energy .  There is no getting around the physics of that.  There is 27 times more power in a 15 knot wind than a 5 knot wind.  The key takeaway here is that regardless of the technology, you need good wind to get good performance from a wind generator .

What affects the ability to maximize output power capture shown above?

Wind generator power is dependent on wind speed, battery acceptance rate, and applied load , so a variable load and a discharged battery was used to characterize the absolute capture power for the data above.  As the wind increases, your wind generator will already be charging full-time, and the battery bank's acceptance-rate, in amps, will decrease as the battery charges and its voltage increases.  So, it is important to understand that by the time the wind is blowing 20 knots or more it is likely your batteries will not be capable of accepting the full amount of amps that any generator can provide.  This is good.  It means that your batteries are reaching a full state-of-charge, and that you have the headroom in power to cover any other loads as they arrive, without further discharging your batteries.  At the end of the day, it is best to think of a wind generator as a free-energy variable power source, whose output changes day-to-day depending on the available wind and the presence (or absence) of downstream electrical loads that it requires to generate power.

Read the following pages to learn about the MK4+, and view the video below to see how it performs against a much more expensive wind generator at very low wind speeds.

Our Integrated "Wind-System": Many popular marine wind generators are essentially sold in kit form, with the user left to decide what method of control they need to get the power into their batteries effectively.  Alternatively, some turbines have an included charging set-up, but offer what is essentially a simple automotive voltage regulator and a load diverter.  This can be a real problem for those wanting to optimize charging and protect their expensive batteries.  It is not enough to just generate efficient and effective power at the generator head. It is just as important to get that power effectively into our battery bank, and to regulate that power based on the battery's specific demands for voltage and current throughout its charging cycle.  By use of an IU charging profile, the system not only can be more efficient, but can also significantly prolong the life of the batteries by preventing overcharging.  Typical load diverter type controllers can only charge your battery to about 80% State-of-Charge (SOC).  This partial cycling is particularly bad for your batteries. Combining the Low Start-Up Speed "Tortoise Approach" with the High-Power "Hare Approach": Having seen both real-world performance in various anchorages around the world, as well as published performance testing over the years, we realized that the best approach out there on the "real water" was to apply leading-edge technology to each component of the system to find an intelligent compromise between the Tortoise Approach and the Hare Approach to wind energy production. A small wind-system that is capable of making power in low wind speeds can take advantage of a long day with low wind speeds by putting small amounts of power into the battery consistently throughout the day and night (the Tortoise Approach). On the other hand, a larger system can take advantage of big gusts or heavy wind by making tons of power very quickly (the Hare Approach).  The perfect solution for us cruisers would be a two-stage turbine that could be the Tortoise in low wind speeds, or protected anchorages, and could be the Hare in a high-velocity wind environment.   By leveraging leading-edge technologies to make incremental efficiency improvements in each of the discrete components of the wind system, we achieved a "sum of the parts" that meets our goals for an ideal marine wind system in-board.   We believe it is the best marine wind generator on the market for those sailors wanting a high-quality, hands-off, high-output, and super-quiet system.  Our real world data and feedback from our customers backs up that claim.  Read on to see how we did it. The Blade Set: We have found that the practical key to consistent production on-board is to start with a large 1.39 meter swept area, and then to apply leading-edge technology to the blade set to extract the maximum amount of energy.  Swept area is the most critical aspect of energy capture, and the bigger the swept area, the more power, period.  Blade length defines the swept area (Area= π r 2 ), and typically the longer the blades, the stronger and heavier they must be to withstand the exponential increase in torque.  The MK4+ solves this issue by using a unique 20% carbon fiber molded blade that is not only long and rigid, but extremely light as well (<300g).   This allows us to produce a blade that is up to 9" longer than the competition, but it weighs much less, and sweeps up to 40% more area. 

We also focused on the airfoils to get a super-efficient, super-quiet, Aero'coustic blade that gives exceptional power while maintaining low-speed start-up capability.  This way the turbine can take advantage of all-day energy production, but also can generate more serious power when the winds pick up.  It doesn't do much good to have great potential generating capacity if the blades never turn in the real world.  Compare our start-up and output to the competition, and you will see the distinct advantage. Details of the Design: The blade and tail design focuses on several key strategies:

• Low Start-up Speeds
• Very Low Rotational Inertia
• Very Low Noise at Optimum Tip Speeds
• Very Low Yaw Error
• Optimized Tip-Speed Ratio (the ratio of the speed of the tips to the speed of the wind)

While our carbon-fiber reinforced blade set has an extremely low rotational inertia, a strong and lightweight blade is only part of the story.  The starting torque on a wind turbine is generated in the blade area closest to the hub, while the power producing torque is produced in the blade area closer to the tips.  By use of German-engineered computer modeling and simulation, a variable blade profile was produced that can react quickly in low wind speeds, yet produce high torque and optimal tip-speed ratios at high speeds.  The blades are produced in a solid-model-patterned single-cavity injection-molding tool, so that each blade is identical in weight and profile.  Using a 20% carbon-fiber filled polymer makes the blade very light, durable, and repeatable. Lightweight blades have a low rotational inertia, which is critical in wind-energy production in the real world. Low rotational inertia allows the blades to accelerate more quickly, which means they can spin faster in lower wind speeds, therefore keeping the tip-speed-ratio (the speed of the tips vs. the speed of the wind) more constant.  Operating closer to the optimum tip-speed-ratio during gusts also allows the turbine to improve energy capture from these sudden gusts as well. Another way to increase aerodynamic efficiency --and to reduce noise on an airfoil blade-- is to manipulate and control the lateral airflow over the foil.  Of course, some of the best engineering solutions often come from mimicking what is already found in nature. Whales and certain fish have amazing hydrodynamic efficiency and stealth through the use of tubercles , or raised and slotted sections on the leading edges of their fins.  Our blades likewise use biomimicry-inspired riblets along the leading edge of the blades, which help the airfoil to create more power at lower speeds, and to operate more efficiently in turbulent air streams.   These Aero'coustic riblets, also prevent the air from traveling down the blade edge and "vortexing" off the blade tip contributing to tip noise. The noise you hear from most wind turbines is the sound of wasted energy. How quiet is it... really ? The MK4+ is extremely quiet, and we have never heard one quieter.  In fact, it measures only 35dB at 5 meters in 10 knots of wind.   At 15 knots, just a flutter, but no tip noise.  As the wind builds the flutter noise will increase.  Above 30 knots, everything exposed to the wind at that velocity will generate some noise, including the MK4+.  To get an idea of how quiet it really is, just watch the video below.  Note that the video was shot with a CMOS rolling-shutter camera, so the blades appear to be turning slowly, while in actual fact they are turning at several hundred RPM.  Video compliments of customer Hayden Cochran on his Island Packet "Island Spirit":

What is Yaw Error, and why is it so important?

This is quite different from most of the other, and more expensive, 400W generators.  The typical marine wind generator charge controller uses 50 year-old technology, which is simply a load-diverter switch, which, upon reaching a set-point, diverts 100% of the energy to a set of resistive elements (essentially heater coils).   So, when the battery reaches its dumpload set-point it isn't actually fully-charged, and this type of Partial State of Charge (PSOC) cycling damages the battery by reducing its capacity, and sulfating the battery plates.  They can't fully-charge the battery because they have no way to dump only the excess power produced, while continuing to top up the battery.  They can only dump all of it. The best scenario would be to have a way to progressively dump power so that the batteries could be fed with only the power that they need at this final stage of the charging process.   

 The controller is very compact (5-5/8" H x 5-7/8" W x 3-1/4" D), fanless, and is designed to be bulkhead mounted.  

It has the following additional features:

(1) Full monitoring capability (Volts, Watts, Amps), no additional battery monitors, shunts, panels, or displays needed (2) Backlit LCD display with clear graphical readout (3) Manual Brake deployment via keypad, so no additional stop switch is required (4) Battery charge level indicator (5) External load control (for managing lighting, etc)

Unlike some other popular marine wind generators which have internal controllers, there are no on-board electronics in the hot and salty elements, and there is no need for additional rectifiers, heat sinks, stop-switches, large resistive loads, or ammeters.  It all happens automatically and safely within the charge controller. It even protects from over-charging and under-charging. It is truly a hands-off charging solution.

Maintenance and Warranty: The MK4+ is designed to provide years of trouble-free service out in the elements, and has a 3-year warranty against defects in materials or workmanship.  We specified a simple and rugged mechanical set that uses very few parts, is easy to maintain, and will stand up to the rigors of the marine environment.  Unlike most single bearing automotive alternator-based designs, our dual low-friction rotor is supported by two low-friction bearings to provide long-life and easy start-up.  The unit is easy to disassemble, understand, and maintain.  The body is made of a lightweight magnesium and aluminum alloy, which is pre-treated with a zinc-aluminum nano-coat, and then a double marine-grade  epoxy powdercoat to resist oxidation and corrosion.   The MK4+ is bluewater tested by full-time cruisers, and like all of the Marinebeam products it is backed by the best technical support and warranty in the business.  Be sure to look at the various customer installation picture above to see some of our installations around the globe.

Interesting Links

Click here for our Frequently Asked Questions (FAQs) document.

Link to download PDF copy of installation manual  (V2.2)

Link to download PDF copy of controller manual  (V2.1)

Should you have further questions, feel free to contact us by phone or email.  Jeff, our resident MK4+ technician can be reached M-F 9-6PM at (864) 275-7837.  Or you can reach him by email at [email protected]

Product Videos

Custom field, product reviews, write a review.

18 Reviews Hide Reviews Show Reviews

Marinekinetix mk4 wind generator - highly recommended.

Posted by David Pollock on 28th Jan 2024

I’ve had my MarineKinetix MK4 Wind Generator for over 10 years and it has performed flawlessly! It is an exceptional product! Produces great power and is super quiet. While I also have solar, in the winter down in the Keys or further south, the daylight hours are reduced. But there is usually a 10+ knot wind. Nothing like waking up in the morning with the batteries fully charged. And quiet - I have had guests on my boat in a mooring field comment on the noise of wind generators on other boats. The MK4 is whisper-quiet, built solid with quality materials and they provide great service! Highly recommended!

Posted by Bob Golembicki on 12th Jun 2023

I replaced our very old two bladed Four Wind mizzen mounted generator this past winter with an MK4+ and are very happy with the output and how quiet and well balanced the new generator is as we’ve been sailing around the Chesapeake Bay this year. We’re running the engine to charge only on very calm days and maybe half as much as we had to with our old generator.

Posted by George Cline on 17th Feb 2023

Love my new wind gen. It’s quiet. Build quality is top notch. Installation is simple. Much happier with it than my previous wind gen from another brand.

Awesome product

Posted by Bob Osborn SV Pandora on 9th Dec 2022

After spending time with fellow Cruisers that had this unit on their boats, I had one installed this year. I had a wind generator years ago that we noisy and didn't put out much power. This one is as good as advertised. Quiet and powerful. I wrote a blog post about our power generating efforts aboard Pandora. Check it out. http://www.sailpandora.com/?p=12803

Recommended

sku: WR-10-3G

Round profile 10/3 marine tinned cable.

sku: CB-50A-42

50 amp manual reset circuit breaker.

sku: MK4-MOUNT

Marine wind generator mounting pole hardware kit.

sku: BL-MK-4+

Replacement blade for marinekinetix mk450 or mk4+ wind generator.

These 150-foot-high sails could help solve shipping’s climate problem

Harnessing the power of wind could both reduce emissions from cargo ships and extend the life of these vessels.

A previous version of this article said Norsepower's rotor sails typically help ships save 8 to 10 percent on fuel. Those numbers came from one trial onboard the Maersk Pelican; the company says a better estimate for typical fuel savings across all ships is 5 to 25 percent. The article has been corrected.

To cut costs and carbon emissions, cargo ships are putting a new spin on an ancient technology: the sail.

These aren’t the sailboats of yore. Modern sails look more like airplane wings, smokestacks or balloons, and they use artificial intelligence to catch the wind with little help from mariners who long ago forgot the art of hoisting a mainsail.

Sails can reduce an existing ship’s fuel consumption — and greenhouse emissions — by something like 10 or 20 percent, according to maritime experts, making them an attractive option for ship owners looking to cut costs or comply with environmental regulations.

Ships burn some of the world’s dirtiest fuels and generate roughly 3 percent of global emissions, a share that’s only expected to rise over time , according to the United Nations. The European Union created a cap-and-trade system for shipping emissions earlier this year, and the U.N. International Maritime Organization is finalizing its own emissions rules now that would penalize the owners of dirty vessels.

Rather than sending those dirty vessels to the scrapyard, companies can install sails to clean up some of their emissions and extend their ships’ lives. And as the industry eventually moves toward alternative fuels that are low-carbon but high-cost, saving money on fuel will become even more important.

There are now 39 large commercial ships with sails, according to the International Windship Association, an industry group that represents sailmakers, ship owners and ship designers. That’s a drop in the bucket compared with the roughly 100,000 cargo ships plying the seas , but the technology seems poised to take off as sails move from test projects to real-world use. Sailmakers are building new factories to meet the expected demand.

“We’re at an inflection point,” said Matthew Collette, a professor of naval architecture and marine engineering at the University of Michigan. “We’re going to see this coming very quickly to a larger number of ships.”

Here are some of the strange sails that may one day push your online orders across the seas.

Ships with wings

One of the most versatile sail designs looks and works a lot like an airplane wing.

“All we’ve done is taken that wing and put it vertically,” said John Cooper, CEO of BAR Technologies, a company that manufactures this type of sail, “so instead of creating lift, we’re creating thrust.”

On an airplane, wind flows over the wings and creates air pressure differences that push the plane up. On a ship, the wings work the same way — except they’re angled to push the ship forward.

The wings come with sensors that measure weather conditions, and they automatically change their angle and shape to catch the wind. These sails can typically be used for most of a voyage, but they fold down to the deck if the wind blows faster than 30 knots, or when the ship is docking or loading cargo.

Last year, BAR Technologies installed two of its wings on a 43,000-ton ship designed to carry dry bulk cargo such as grains, coal or minerals. Over its first six months, the ship saved 14 percent on fuel as it crisscrossed the Atlantic, Pacific and Indian oceans, according to the ship’s owner.

The return of the rotor sail

At first glance, rotor sails may look like smokestacks rising from the deck, but they’re actually tall, rotating cylinders that use wind to push a ship forward.

When the wind is blowing at the right angle, an electrical motor spins the rotor sails, speeding up the air flow on one side of the sail and slowing it down on the other. That creates an air pressure difference that pushes the ship forward.

Norsepower, the biggest rotor sail manufacturer, says they typically help ships save 5 to 25 percent on fuel.

Rotor sails are more than a century old; German inventor Anton Flettner patented the idea in 1922 and an experimental cargo ship fitted with rotor sails crossed the Atlantic in 1926. But Norsepower, which is based in Finland, says the sails have come a long way since then, thanks to lightweight composite materials and AI systems that adjust to the wind to make the sails more efficient.

“We can make a much better sail than Mr. Flettner did in the 1920s,” said Tuomas Riski, Norsepower’s CEO.

The Michelin Man sail

Michelin is developing a more experimental inflatable sail which, appropriately, looks a lot like the company’s mascot.

Michelin’s design works similarly to a classic sail, made to catch the wind and redirect its power forward. The main difference is that its sail is made of inflatable fabric instead of a canvas sheet, and its mast can retract down to the deck. The sail can change its size depending on wind conditions.

Like the other sails, Michelin’s product operates by itself. “It has to be fully automated because today’s sailors have no time and no particular knowledge about sails,” said Gildas Quemeneur, who is leading the project.

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New offshore wind turbines can take away energy from existing ones

As summer approaches, electricity demand surges in the U.S., as homes and businesses crank up the air conditioning. To meet the rising need, many East Coast cities are banking on offshore wind projects the country is building in the Atlantic Ocean.

For electric grid operators, knowing how much wind power these offshore turbines can harvest is critical, but making accurate predictions can be difficult. A team of scientists at the University of Colorado Boulder and their collaborators are working to tackle the challenge.

In a new paper published March 14 in the journal Wind Energy Science, a team led by Dave Rosencrans, a doctoral student, and Julie K. Lundquist, a professor in the Department of Atmospheric and Ocean Sciences, estimate that offshore wind turbines in the Atlantic Ocean region, where the U.S. plans to build large wind farms, could take away wind from other turbines nearby, potentially reducing the farms' power output by more than 30%.

Accounting for this so-called "wake effect," the team estimated that the proposed wind farms could still supply approximately 60% of the electricity demand of the New England grid, which covers Connecticut, Maine, Massachusetts, New Hampshire, Rhode Island, and Vermont.

"The U.S. is planning to build thousands of offshore wind turbines, so we need to predict when those wakes will be expensive and when they have little effect," said Lundquist, who is also a fellow at CU Boulder's Renewable and Sustainable Energy Institute.

Understanding the wake effect

When wind passes through turbines, the ones at the front, or upstream, extract some energy from the wind. As a result, the wind slows down and becomes more turbulent behind the turbines. This means the turbines downstream get slower wind, sometimes resulting in lower power generation.

The wake effect is particularly prominent offshore, because there are no houses or trees that stir up the air, which helps dissipate the wakes, said Rosencrans, the paper's first author.

Using computer simulations and observational data of the atmosphere, the team calculated that the wake effect reduces total power generation by 34% to 38% at a proposed wind farm off the East Coast. Most of the reduction comes from wakes formed between turbines within a single farm.

But under certain weather conditions, wakes could reach turbines as far as 55 kilometers downwind and affect other wind farms. For example, during hot summer days, the airflow over the cool sea surface tends to be relatively stable, causing wakes to persist for longer periods and propagate over longer distances.

"Unfortunately, summer is when there's a lot of electrical demand," Rosencrans said. "We showed that wakes are going to have a significant impact on power generation. But if we can predict their effects and anticipate when they are going to happen, then we can manage them on the electrical grid."

A balancing act

In early 2024, five looming wind turbines off the coast of Massachusetts from the country's first large-scale offshore wind project delivered the first batch of wind power to the New England grid. More turbines are under construction off the coasts of Rhode Island, Virginia and New York. The Biden Administration has set a goal to install 30 gigawatts of offshore wind capacity by 2030, which is enough to power more than 10 million homes for a year.

Compared with energy sources derived from fossil fuels, wind and solar power tend to be variable, because the sun doesn't always shine and the wind doesn't always blow.

This variability creates a challenge for grid operators, said Lundquist. The power grid is a complex system that requires a perfect balance of supply and demand in real-time. Any imbalances could lead to devastating blackouts, like what happened in Texas in 2021 when power outages killed nearly 250 people.

As the country continues to expand renewable energy projects and integrates more clean electricity into the power system, grid operators need to know precisely how much energy from each renewable source they can count on.

To better understand how the wind blows in the proposed wind farm area, Lundquist's team visited islands off the New England coast and installed a host of instruments last December as part of the Department of Energy's Wind Forecast Improvement Project 3. The project is a collaboration of researchers from CU Boulder, Woods Hole Oceanographic Institute and several other national laboratories.

The instruments, including weather monitors and radar sensors, will collect data for the next year or more. Previously, offshore wind power prediction models usually relied on intermittent data from ships and satellite observations. The hope is that with continuous data directly from the ocean, scientists can improve prediction models and better integrate more offshore wind energy into the grid.

In addition to the growing demand for air conditioning and heat pumps, electricity consumption in the U.S. has been rising rapidly in recent years because of the increasing prevalence of electric vehicles, data centers and manufacturing facilities. Over the next five years, analyses project that electricity demand in the U.S. will increase by nearly 5%, a substantial increase compared with the estimated annual growth rate of 0.5% over the past decade.

"We need a diverse mix of clean energy sources to meet the demand and decarbonize the grid," Lundquist said. "With better predictions of wind energy, we can achieve more reliance on renewable energy."

• Wind Energy
• Electricity
• Energy Technology
• Energy and Resources
• Energy and the Environment
• Renewable Energy
• Environmental Science
• Sustainability
• Electricity generation
• Renewable energy
• Wind turbine

Story Source:

Materials provided by University of Colorado at Boulder . Original written by Yvaine Ye. Note: Content may be edited for style and length.

Journal Reference :

• David Rosencrans, Julie K. Lundquist, Mike Optis, Alex Rybchuk, Nicola Bodini, Michael Rossol. Seasonal variability of wake impacts on US mid-Atlantic offshore wind plant power production . Wind Energy Science , 2024; 9 (3): 555 DOI: 10.5194/wes-9-555-2024

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Business | Steel tubes ready for start of Virginia Beach…

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Business | steel tubes ready for start of virginia beach offshore wind farm construction, port officials say.

The first batch of the enormous metal structures used as wind turbine bases in Dominion Energy’s offshore wind farm will soon be headed on a boat to the construction site off the coast of Virginia Beach, Virginia Port Authority officials said Tuesday.

Six monopiles — steel tubes almost as long as a football field — are ready to be loaded onto the Orion vessel to be installed at the wind farm site, Virginia Port Authority Chief Development and Public Affairs Officer Cathie Vick told the port’s board of directors during an April 30 meeting.

The monopiles will be begin their sea journey to the site in about a week, Vick said. There are 36 total monopiles at the Portsmouth Marine Terminal staging area.

“This is now getting very real,” Stephen Edwards, Virginia Port Authority CEO and executive director, said about the offshore project during the meeting.

May 1 is the first date the company is allowed to begin installing the structures, Dominion Energy spokesperson Jeremy Slayton said in an email. He said the Orion is currently undergoing preparations to begin the installations.

Fabricated in Germany, the monopiles arrived in Portsmouth in October. The $9.8 billion Coastal Virginia Offshore Wind project will be located 27 miles off the coast of Virginia Beach and generate enough electricity to power up to 660,000 homes, according to Dominion Energy. Construction is planned to continue until the end of 2026.

In other capital project updates, Vick said construction is now complete on an expansion to the central railyard at Norfolk International Terminals. The $83 million project included two new rail track bundles and three new rail-mounted cranes.

Additionally, construction began on a modernization project at the north berth at Norfolk International Terminals, Vick said. The project includes new cranes and a new container stack yard , according to the port.

Lastly, Vick said construction efforts to widen and deepen the port’s channels to at least 55 feet are more than halfway finished. The port is now able to handle two-way traffic of ultra-large container ships as of earlier this year. Vick said the $450 million dredging operation to deepen the harbor to 55 feet and the ocean to about 59 feet is being handled in phases, with the final phase scheduled for completion by August 2025.

Trevor Metcalfe, 757-222-5345,  [email protected]

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