If 1HP = 750W, then 12HP = 9,000 watts. I've been estimating 10kWh/gallon, perhaps that has been too generous, but this might be close enough for our estimations. I've also been using an 80% efficiency for electric drives to allow for other various losses.
Both of these factors should tend my estimates towards the conservative side. But I don't think that many people would be upset if their conversion performed better than they planned. :)
Eric
--- In electricboats@yahoogroups.com, "dennis wolfe" <dwolfe@...> wrote:
>
> Per wikipedia http://en.wikipedia.org/wiki/Brake_specific_fuel_consumption a modern 4 stroke gasoline engine produces one hp-hour with 0.5 lbs. fuel. That means a gallon of gas (@ 6lb/gal) can produce 12 hp-hr or 16 kWh. Most of the energy in the gas is converted to heat in the engine, not useful work.
>
> What is unsaid is that an electric system is around 90% efficient over a wide range of speed while an ICE is quite a bit less efficient running at low load.
>
> Denny
>
>
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