Wednesday, January 26, 2022

[electricboats] Sizing batteries for a small boat

I am looking to repower a 22ft Norwegian wooden boat with an electric motor.  The boat weighs in the 2500-3000 lb range.  The 5kW thunderstruck kit would probably do, but their advice is to get a 10kW kit because the motor is air cooled and not sealed.  I am ok with that advice.  This is not a sailboat I am looking at continuous power draw for 4-5 hours.  On a sailboat I have used a Minn-Kota for getting in/out of the marina with good results.

The question comes to sizing the battery pack.   Does anyone have real world numbers for speed and amp draw for a small boat like this?   My goal is to be able to cruise 20nm, perhaps 30 in a stretch.   I am thinking somewhere in the 4 kt range.

Secondly, any real world experience using a regular 2000W generator to power the charger while the small boat is underway?

Any guidance or pointers appreciated.

Cheers, peter

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