Just to clarify my original post:
The 9.6kwh battery in our Ericson 27 @ 7000lbs displacement works very well. We rarely see more than 1/3 of the capacity used. We're also located in SF Bay, with plenty of wind. Long motoring doesn't factor heavily in our sail plan.
The Rawson 30 with 12kwh and 13,000lbs displacement must motor upriver to get back to its slip, frequently against the wind. Seeing 8kwh used is getting pretty close to danger-will-robinson on a 12kwh "rated" string. I say rated because the actual discharge curve rarely matches the rating curve of a low steady draw.
WattHourPound sounds like a good reference number. It's good to get a few replies, anybody else care to contribute? Perhaps add a factor to correct for typical use? Low, Medium, and High usage along with the WHP and the effectiveness.
Ericson 27, 1.4whp, low use, more lead than required.
Rawson 30, 1.0whp, heavy motoring, frequent deep discharge is reducing battery lifetime.
Catalina 30, 1.1whp, medium motoring, about 50%dod is typical. Day charter boats with 4x8D's, good match.
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Arby Bernt
Advanced Marine Electric Propulsion
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