.... wouldn't like 20ah 48v mobility scooter lead acid batteries be fine for light use?
Yes it would if the boat weighed about the same as the mobility scooter. Otherwise you're gonna need a wee bit more.
20AH lead acid (which means 10AH of usable capacity) will run your motor at 1000 watts for maybe 20 minutes? Might be enough for your needs but stay far away from trouble (like a lee shore).
Look at this example in a similar sized boat:
https://endless-sphere.com/forums/viewtopic.php?t=108411
Very interesting project by someone who knows what they are doing with electric drives for bikes but just getting into the marine application with a sharp analytical approach. His original plan was to do a parallel system with the diesel but the diesel was too far gone to make that practical. Maybe the same Yanmar you have. His solution will still likely be beyond your budget from the sound of it.
You might also look into electric outboard solutions.
Dan Pfeiffer
Thanks for replying
Thunderstruck looks great but I'm on a budget and the sailboat is not worth a lot. I would happily go with thunderstruck for a bigger boat I could see myself having for 5-10 years.
LFP batteries would be nice but wouldn't like 20ah 48v mobility scooter lead acid batteries be fine for light use?
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