I bet the the first batch of batteries will be basic golf cart 6 volts. Yes 15 nm @ 4 knots would be lovely, the 6 knot max is to help with narrows and the like. For the most part I try to plan my routes to take advantage of the currents.
I am not sure of the "local" conventions for labeling motors, but I assume a 7kW motor @ 48 volts is pulling ~150 amps? I imagine that if I up the voltage I could save some cash on cabling, say to 72 volts which could pull as much as 100 amps (I understand that controllers can be programmed to limit such things).
Eric, I sure appreciate the offer to confirm number and to answer questions. I usually do quite a bit of research before embarking on such projects, and I apologize that you folks get me at the very beginning of that process.
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