Good info, Steve.
Those numbers are about what I would expect, 250-300W per drive system at faster than 7kts. Of course, regen above 8kts gets even better. But your 40'+ catamaran can sail a whole lot faster than my 30' monohull.
I don't remember the size of your battery bank. How long would it take to replace 20% of your capacity if you're charging at 600W?
Another way to look at it would be to compare how much current it takes to drive your boat at 6kts compared to how much current you harvest at 7.2kts.
For most 30-32 boats that can regen, it takes more than 30 minutes sailing at 6kts (if conditions allow) to replace the power used in 1 minute of motoring at 5kts.
You observations do make the case for large multihulls as a better platform for an electric conversion. Lighter than similar monos, faster, more room for solar panels, all heading in the right direction....
Thanks for the real life data.
Eric
--- In electricboats@yahoogroups.com, Steve Dolan <sdolan@...> wrote:
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> Attached is a picture of my 2 Amp Meters showing 2.0 and 2.1 Amps. In the upper Left of my Simrad Plotter you can see the Speed at 7.2 Knots. The Voltage is 144V. Sorry photo taking is not a strong point.
>
>
> Steve in Solomons MD
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