Re: [electricboats] advice not on sailing boat

I produced this table from the first row and it looks like 48V might be a better solution.
I was basing the 24V suggestion off of your statement that 4kW can hit hull speed.
But that's with no headroom for current/wind/heavy-loads:

72V 3,000rpm 11.5kW

60V 2,500rpm  9.6kW

48V 2,000rpm  7.7kW

36V 1,500rpm  5.8kW

24V 1,000rpm  3.8kW

12V   500rpm  1.9kW

And 48V is a much more common electric boat battery size compared to 24V.
With around 2:1 reduction you should be able to hit hull speed.  You may actually
be a bit underpropped though, if more like 1,200 prop RPM is needed.  So just
cut the reduction down to more like 1.8:1.  You'll be mainly operating in the lower
half of the 0A-200A motor current range, so not that hard on it or the controller.

There shouldn't be much inefficiency running the motor at less than 72V.  Possibly
they have a published spec for efficiency versus input voltage?  Too-low voltages
mostly suffer from needing more current and thus resistance goes up, unless you
go big on conductors (but inside the motor/controller are out of reach).  I would
think that 48V is pretty close to the sweet spot for the motor (if it even has one).

Here's my 10kWh 48V battery:

https://www.youtube.com/watch?v=fmk1_ynLdwI

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