Hi Arby,
I would think that the energy storage would vary quite widely, independently from displacement.
I can visualize a large range of kWh installed in any given hull, depending on range requirements, what charging sources are available, and how much battery weight, cost, and space is allowed.
For what it's worth, I have 8.6kWh installed on a boat that displaces 3100 lbs. For most of my trips that is plenty. Sometimes, like on my all-day run today, 12-16kWh would be nice.
-Tom
--- In electricboats@yahoogroups.com, Arby Bernt <arbybernt@...> wrote:
>
> We have a nice rule of thumb for power, about 1kw per ton of displacement.
> I'd like to propose a battery standard.
> How does 1wH per pound of displacement work?
> Our test boat, a 7000lb Ericson 27 has 9600wH, and is never worked. A 13000lb Rawson 30 I converted has 12kwH of power, and it gets worked.
> Other Systems..?
>
> Arby Bernt
> Advanced Marine Electric Propulsion.
>
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