Recent content by catharsis

Charging and driving at the same time? If solar boat, yes...

From the international boat standard ISO 10133: 4.5 All d.c. equipment shall function over a voltage range at the battery terminals as follows: - for a 12 volt system: 10.5 V to 15.5 V; - for a 24 volt system: 21 V to 31 V. 4 * 3.7 V = 14.8 V So, why worry?

If your board will go about 20 knots (10 m/s) and use 4 kW electric power, efficiency min is 50%, the thrust you need is 2000 W/(10 m/s) = 200 N.

Normally a boat need about 30 kW/1000 kg to plane. So if your boat with grew weights about 120 kg, you need about 4 kW of shaft power. The wider the board the better.