The principle is simple: using the speed of the boat to turn an immersed propeller and produce electricity.
Explore the Watt&Sea website or contact us to learn more
In 2015 we became a dealer for Watt&Sea Hydrogenerators for Canada and the USA – and our customers elsewhere in the world. A green product that is very much in line with our high standard of quality and engineering, the Watt&Sea is, like the Hydrovane, of huge value to the offshore cruiser.
I can’t wait to mount one on our Hydrovane!
– Will Curry
HOT SEAT WITH WILl & RICHARD
10 Reasons to choose Watt&Sea
- High electric output – 24 Amps at 7.5 knots of boat speed
- Negligible drag because of leg and blade shape
- A source of free green power
- No need to run the engine to charge: saving in fuel consumption
- Completely quiet
- Lightweight
- Easy to install, especially with the Hydrovane bracket
- Maintenance-free
- Has a sleek design and look… just like the Hydrovane!
- Designed and manufactured by top racers and engineers in France
Mount the Watt&Sea on your Hydrovane
Install your Watt&Sea in the perfect position – attached onto the Hydrovane shaft.
This unique installation, exclusive to Hydrovane owners, means no extra holes in the transom and allows easy use and removal of the Watt&Sea.
See the Galleries section for photos.
| Part Name | GBP £ | EURO € | USD $ | CAD $ |
|---|---|---|---|---|
| Hydrovane's Watt&Sea Mounting Bracket (pair) | 483 | 628 | 652 | 869 |
Watt&Sea Frequently Asked Questions
Which model, leg, and propeller size is best for me?
Please email Richard with your boat type, a photo of the transom, average cruising speed, and shipping location. He can provide further information, answer any questions, and send a complete quote.
How does the it integrate into my charging system?
The Watt&Sea comes standard with its own converter and MPPT charge controller to hook directly to your batteries or central bus. The system is plug-and-play and compatible with any existing infrastructure.
What type of batteries can it charge?
The system is compatible with any type of batteries including lead-acid, AGM, and Lithium. If needed, charging and float voltages can be manually set via the Bluetooth app.
What speed loss is to be expected?
Watt&Sea doesn’t have any specific data on the effective drag of the device, or about the speed loss it generates. All immersion and lifting trials at constant speed have not shown any substantial difference on the speedometer for a loaded cruising boat. Testimonials back this up.
Can I replace the propeller?
Yes, replacing the propeller is simple and only requires an allen wrench and an extractor screw.
How should I maintain the device?
Wash down the outside with fresh water from time to time. The device does not require any specific maintenance.
What is the anti-corrosion treatment?
The aluminum parts are anodized, and coated with paint. They are also electrically insulated from the other metallic parts to prevent electrolytic corrosion.
How reliable is the system?
The Watt&Sea has been designed with the latest technology. All metal parts are made either in specially treated aluminum or in 316 stainless steel.
The generator housing is sealed with hi-tech ceramic-carbon gaskets. These gaskets have a lifetime of several thousands of hours and will painlessly support a circumnavigation.
The housing is filled with a lubricating oil and slightly pressured to prevent any water seepage.
In addition, the alternator is immersed in a resin that encapsulates electrical conductors. Should any dampness occur, the electric parts would not be damaged.
Overall, the system is impeccably designed and built – and is therefore highly reliable.
What power output can I expect?
The power generated increases exponentially as boat speed increases. At 5 knots, the output power is about 120W (or about 10A on a 12V battery) with the 280mm propeller. At 8 knots, the system produces 4 times more power, i.e. 480W (about 40A in 12V ). The output may differ depending on sea conditions.
