In addition to systems that consume fuel, there are three possible systems for power supply at sea: solar modules, wind generators and hydrogen generators. The first two only supply electricity when the sun is shining and there is sufficient wind. This can be scarce at night and on a downwind course where the apparent wind is very weak. A hydrogenerator can close this gap, but the prerequisite for this type of power supply is that the ship is travelling.
The hydrogenerator from Ocean-Power is said to be particularly efficient and less prone to failure. One of the reasons for this is that the rotor and the outer winding of the generator are individually encapsulated and there is no seal between the propeller shaft and the housing. Where there is no seal, there is also no chance of paint build-up, and the components should all be resistant to seawater. Rolling bearings ensure smooth running.
According to the manufacturer, the hydrogenerator should start to generate electricity when travelling through water at around three knots. At
12 volts, 1 ampere of current should then flow. At a speed of five knots it should be 6.5 amps and at six knots 10 amps. This is enough to compensate for the consumption of an autopilot.
The shaft with generator and propeller is 75 centimetres long, while the aluminium rods for attaching to the transom measure 100 centimetres. However, the manufacturer promises to cater for customer requests if the standard dimensions do not fit the boat. The hydrogenerator weighs seven kilograms.
The hydrogenerator from Ocean-Power costs 1998 euros.
