Ben,
It's doable. First, a quick question. What kind of batteries (FLA, AGM, LiFePO4) do you think that you will use? (trust me, it makes a difference).
I'm assuming that you're looking for 15nm at 4kts. At higher speeds, your range will drop considerably. Your 7 ton boat should get a 7kW drive to provide basic safety maneuvering, not blazing performance. So you will need to pick your motor appropriately. Remember that gearing trades speed for torque, the power stays the same. Considering that you're in the Seattle area, I know that tidal currents can be an issue.
If you confirm these assumptions, I can work up some numbers for you.
Fair winds,
Eric
Marina del Rey, CA
--- In electricboats@yahoogroups.com, "benmckee@..." <mckeeb@...> wrote:
>
> I just joined the forum a week or so ago, and have been lurking since then. I am plotting the removal of my Vetus 3.10 (its been plotting my removal for years!) from my 30 LOD pilot cutter (~7tons). I would LOVE to go sailing for a weekend and not smell like fuel after bleeding the fuel system for the umteenth time.
>
> The sketch of the conversion plan is to build up a 48 volt system, capable of moving the boat a 6 knots in flat water, but planning on running at 4 most of the time. I have fantasies of a 15 mile range, and using a little Honda generator to extend the range.
>
> Regards,
> Ben
>
> mckeemarine.com
>
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