Ynovex is an energy solution provider for yachts.
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The most powerful hydrogenerator of its kind

Download hydrogenerator datasheetEfficient and reliable solution for generating all the needed power when cruising or racing. A high output, quiet and very low drag retractable stern leg on the transom. Maintenance free. Effective from 3 to 20 knots of boat speed. While sailing energy self-sufficiency can be reached from 5 knots.

NEW for 2014: now up to a staggering 48 Amps output. The new generation is even more efficient, lighter and easier to handle.

Cruising hydrogeneratorsCruising hydrogenerator 300 and 600

  • Power: 10 Amps at 5 knots and up to 48 Amps at 9 knots (12 Volts)
  • Start-up speed: 2 knots 
  • Four models
    • 300W or 600W output
    • Short and long.
  • 12V to 24V MPPT converters included.
  • Improved bracket with integrated cleat for easy handling.
  • Up to 2kg lighter with improved hydrodynamics for reduced drag.
  • Mounting kit

The 240mm propeller delivered in the pack is universal. 200mm and 280mm propellers are also available in order to optimize energy production according to boat speed and weather conditions.

With its advanced electronic, the new generation of voltage regulator for 2014 is now 96% efficient and IP64. It includes an auxiliary solar input and two battery banks outputs.

Cruising hydrogenerator output graph 

Pittman Innovation Award 2013 from Sail magazineAverage production values are indicative, subject to possible variation according to sea conditions while sailing and to the quality of the installation.

Additional resources:


Frequently Asked Questions

Installation procedure: Voile Magazine April 2013 in French

Optional advanced mounting kit with IP68 waterproof connection kit for easy handling

Awards: the cruising hydrogenerator has been granted a number of awards including the  2013 Pittman Innovation Award by Sail magazine, the most prestigious North American sailing magazine.

Hydrogenerator 2014 easy handling with integrated cleat 

Configuration examples

Pogo 10.50, Pogo 12.50, Akilaria Class 40 and on Anse 545

Beneteau First 40.7, Beneteau First 30

Dragonfly trimaran, Catana catamaran, Lagoon 400S2


Product Range Cruising 300 Cruising 600 Racing
Output:  300W - 24Amps 12V 600W - 48Amps 12V 600W - 48Amps 12V
Models: Short Long Short Long Aluminium Carbon
Navigation Program Cruising Cruising, racing  Offshore racing
Optimal boat speed  2 to 10 knots  2 to 14 knots  5 to 30 knots 
Max speed 20 knots 30 knots
Alternator  Highly efficient custom designed brushless permanent magnet alternator from Leroy Somer/Emerson
Converter MPPT 12 to 24V - High efficiency 96%
Size mm Leg 610 970 610 970 610
  Overall  920 1,280 920 1,280 920
Weight kg Hydrogenerator 6.3 7.1 7.4 8.2 8.5 6.5
  Converter 1.5 1
Hydraulic N/A 1
Material  Leg Aluminium Aluminium Carbon
  Alternator Composite Aluminium Stainless Steel
  Prop Composite Stainless Steel Stainless Steel
Propellers Standard 240mm three blades Three blades variable pitch
  Optional 200mm and 280mm N/A
Warranty 2 years
Product # PK-610-300 PK-970-300 PK-610-600 PK-970-600 PK-610-600-PV PK-610-600-PV/CAR
Download dimensions           Dimensions hydrogenerator racing 


Item Description Part$
IP68 waterproof
connection kit
For clean and waterproof electrical connection. It includes : 1 male connector + 1 female connector + 2 watertight stoppers + 10 m of 3 x 2,5 mm2 thermo-assembled cable. Its high quality guarantee an optimum electrical connection. Easy mounting with only a screwdriver. WS-PL-C- 001
Propellers Various prop size allows you to optimize energy production according to boat speed and weather conditions. It is recommended to always carry a spare prop for backup. 200mm: P-200-3
240mm: P-240-3
280mm: P-280-3
NEW 2014
Converter 12-24 Vdc
This new generation of MPPT converter is now 96% efficient. You get more energy out of your hydrogenerator. IP64, no fan. Equipped with an extra input for 10-50 Vdc solar panel with MPPT and 2 outputs for charging two battery banks. CV-03
Removable mounting kit for transom The mounting of the hydrogenerator becomes simple and easy. The hydrogenerator can be removed without any tool. Suitable for many type of transoms. It includes 1 U support + 1 V support + 2 pintles + 1 locker and its pin + screws + 2 X 2 meters of Dyneema rope.  It is the ideal mounting solution! FA-03
Extra U support for "removable mounting kit ref FA-03" It allows a double position removable mounting (port - starboard). With this type of mounting, preferably choose a short hydrogenerator. U-03
NEW 2014
Hydrogenerator carrying bag
Designed for the transportation, protection and storage of your hydrogenerator. High strength material on the outside and anti-abrasion inside. Reinforced straps, drainage holes, storage pocket for spare propeller. BAG-610-01
NEW 2014
Support + cleat + screws for first generation of hydrogenerator bracket
The cleat installed very near the hydrogenerator allows to maintain it tightly immersed or lifted. Locking and unlocking is done with only one hand. J-03

Racing hydrogenerators
Open 60 Virbac-Paprec 3 designed by Guillaume Verdier and VPLP ready for the Vendée Globe 2012-2013 skippered by Jean-Pierre Dick
Built by Cookson Boats in New Zealand

Carbon and aluminium racing hydrogenerator

The Racing hydro generator is designed for high performance boats. Effective on a speed range from 5 to 30 knots, they are equipped with a fully automated variable pitch propeller minimizing drag and improving energy output.

  • Power: 40 Amps at 12 knots (12 Volts), startup speed at 5 knots
  • Two models, aluminium 8.5kg and carbon 6.5kg
  • 12V to 24V converter included
Racing hydrogenerator output graph

The variable pitch makes it possible to vary electronically the incidence of the blades in order to permanently adapt the power of the propeller to that absorbed by the batteries: when the hydrogenerator is fully powered while the boat accelerates, the regulation slightly decreases the incidence of the blades so that the propeller preserves an identical power. In this way no energy is wasted, guaranteeing a minimal drag as well as a broad speed range of use.

Graham Tourell, Mike Golding’s Gamesa IMOCA 60 Boat Captain, explains about the racing hydrogenerators "On Gamesa, we put them up and down at the same time as the trim tab, which is down at around 8 kts of boat speed and up at around 16-17kts. (...) On Gamesa, we can get 42 amps at 16 kts. This creates a lot of power; more than double what we would be drawing on a typical day. In the South we use the most power with the heating and computers on a lot of the time."

De-facto standard on Class 40 and IMOCA open 60

Cruising and racing hydrogenerators are the outcome of prototypes designed by Yannick Bestaven and his team for the last Vendée Globe, solo race around the world without assistance starting from Les Sables d’Olonne in France in 2008.

Hydrogenerators were the de-facto standard on the Class 40 engaged in the Global Ocean Race 2011-2012 sailing 30,000 miles around the Globe starting from Les Sables D'Olonne in France and returning in May 2012.

Class40 Association logo © Class 40Nick Leggatt from Phesheya-Racing writes: "The Watt’n'Sea has been a remarkable piece of equipment that has reduced our engine running hours, and carbon emissions, to almost nothing for the entire race. [...] This performance is somewhere close to 5 times the typical performance of a wind generator [...].  With wind generators the performance decreases dramatically as one turns downwind and the apparent wind speed drops."

Vendée Globe 2012-2013On IMOCA 60, four of the top five in the Barcelona World Race 2010-2011 were equipped with Watt&Sea hydrogenerators. Hydrogenerators are the de-facto standard for this edition of the Vendée Globe 2012-2013 started on November 10th. The majority of the yacht’s power for the Vendée is provided by twin Watt&Sea racing hydrogenerators, reducing the diesel required at the start by over 200kg. The clean-tech yacht Acciona is 100% EcoPowered for this edition and is "the first 100% sustainable self-sufficient IMOCA".

The New York Times dated December 25th 2012 states: "Hydro generators for racing sailboats became popular after the 2008 race when Yannick Bestaven, the only competitor using hydropower, fine-tuned the design of the Watt and Sea hydro generator that is now seen on every boat in the Vendée Globe."