Hi Richard,
You are correct. The recent suggestion of 1Wh/lb of battery capacity was followed with 1kWh/ton by someone else and the latter is one half the recommended power of the original post. I think for most larger sailing auxiliaries, the 1Wh/lb or 2kWh/ton storage estimate is more realistic. And as another member here already mentioned, this battery capacity recommendation should not be confused with the power rule of thumb that recommends 1kW of drive per ton of displacement.
Fair winds,
Eric
Marina del Rey, CA
--- In electricboats@yahoogroups.com, RICHARD JAMES <dick.james@...> wrote:
>
> Hi all, I've been reading these posts to glean some info for my own project (more later) but I'm a bit confused over the units being talked about. seeing a lot of 1Wh/lb suggested and then 1kWh per ton as if they were the same. Surely 1Wh/lb is equivalent to 2kW/ton, there being 2000lbs in a ton (in the U.S.) or am I missing something....
>
> Richard James
> London, UK
>
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