How to choose the right power : 300W hydrogenerator is designed for boats under 35 feet, and 600w is ideal for + 35 feet sailing boats. But It very much depends on the equipment you have on board !
How to choose the right lenght for my boat : First define the location for your installation ont he transom. You have to respect 3 rules to choose the right location :
* whenever possible, position the hydro several inches to the side of rudder to avoid water perturbations (10cm or 20 cm will be fine)
* The leg must be vertical in the lowered position for the production to be optimised : he propeller axis must be horizontal, aligned with the water flow.
* the recommended depth between the surface and the propeller axis is 300 mm(12 inch), even when the boat heels.
After taking in account this 3 points, the 610 mm or 970 mm leg will be chosen.
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