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Old 09-14-2012
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Re: Replacing IC engine with electric motor

Forget about carbon footprint for a moment. What about the chemical footprint?
Then there are the heavy metals and acids used in batteries (Ni, Ca, Be, Pb, etc) that would be just great for the environment if your boat sank somewhere. Now think about the mining that must go on for those same heavy metals and their eventual disposal.

How your batteries get charged up, especially if you use shore power to do so?

I'm not trying to rain on your parade as I am interested in alternative power sources too, but an electric propulsion system may ultimately have a worse pollution footprint on the planet then existing gasoline and diesel units.
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