1. Figure out what HP yields the speed you want to go.
2. Multiply by .75 and this gives you the kW you’ll need to go that speed.
3. Add about 20% and you now have an idea on the size of the electric motor(s).
4. Next figure out the maximum amount of time you’ll cruise at the speed you’ve chosen.
5. Assume you need a 8kW to motor at desired speed and you want to motor 3 hours maximum - you’ll use 24 kWh.
6. Your battery needs to bigger than 24kWh - let’s say 30kWh to be on the safe side. At 48v, this is is a 600AH battery.
7. If you’re comfortable with electricity, you can buy 16 prismatic cells of 600AH each from China (Winston, CALB, Sinopoly) plus a BMS (battery management system) and assemble the LiFePO4 pack yourself.
8. you’ll need charging - shore charger (Power Max or similar) - wind - solar. The latter 2 need controllers between the source and the battery.
There are a variety of outboards available plus plenty of inboards. I like ThunderStruck-WV.com for the motor and accessories. Outboards such as Torqeedo are available from West Marine and other sources.
Enjoy.
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