Tim,
Going by the rule of thumb that calls for 1kW of drive for each ton of displacement for an auxillary sailboat, your boat should have 3.5 (4.6hp) to 4kW (5.3hp) of power on tap. At 24V, that means 145A to 166A maximum load. At 36V your max load drops to a more managable 95A to 110A. Most of you time should be spent at lower loads than that; however, adverse conditions could require this output for more than a few minutes to get out of a tight spot.
Either solution is doable, but higher amps require bigger cables, breakers, switches, etc. Just something to keep in mind...
Fair winds,
Eric
Marina del Rey, CA
--- In electricboats@yahoogroups.com, "tmalcolm" <tim@...> wrote:
>
> Hi all.
>
> I've been planning my sailboat electric conversion for a while and have pretty much settled on using a Mars brushless ME-3001 motor, direct drive @ 24v or 36v.
>
> The boat is 28' OAL, full keel shoal draft, 7,300lbs displacement. IIRC, prop is 14" diameter, 12" pitch (it's currently in my car which is under 2' of snow!)
>
> I'm thinking direct drive @ 24v. That will keep things simple for connecting the motor, and keep the RPM within range of the previous ICE/prop combo, even though it'll be less efficient than a higher voltage.
>
> Any opinions or advice?
> Suggestions for an affordable controller for this motor?
>
> Thanks,
> Tim.
>
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