Tow generator
A tow generator or hydro generator is a device for supplying energy to sailing yachts . It uses the flow speed of the water and converts its kinetic energy into electrical current that can be used to feed the on- board battery .
The electrical power supply on sailing yachts is problematic, since the engine and thus the alternator should run as rarely as possible and therefore electricity is only drawn from the battery while sailing. However, since electricity is required for lights , navigation instruments , radios and others, electricity must be recharged, especially on longer journeys. In addition to some alternatives (solar and wind), a tow generator can also be used when sailing.
Tow generators are either mounted on the stern like an outboard motor, or are pulled behind the boat on a line (which also contains the cable). Another special form, albeit with higher friction losses, are shaft generators that use the propeller . A propeller is driven by the flow of water and transmits its rotary motion to a generator , which generates electricity from it.
The advantage of the drag generator is a very good energy yield with a relatively compact design. A power of up to 500 watts is common on sport boats. The disadvantage of the tow generator is a certain loss of speed when sailing , as well as the fact that no electricity is generated when lying at anchor or in calm . With the towed generator in particular, launching and retrieving is a bit cumbersome.