Maybe assuming absolute worse case scenario such as power generated by coal fired plants, burning soft coal, I dont know. I do know that if you are looking at shore charging from hydro or nuclear, obviously electric is pretty clean. Large diesel ICE electric generating plants are much cleaner and more efficient than small diesels per kw. Then there is economy of scale. A straight diesel-electric propulsion system of course is not typically very efficient, but a parallel hybrid can be. Solar panels, if you are able to use them for a reasonable projected lifespan, are pretty clean. So just intuitively, without any data at hand, I have to question your figures. No doubt there are others who are probably thinking the same thing.
Much can be done to make electric drives and charging/storage systems more efficient, too. For instance, keeping battery charge in the bulk charging range most of the time and only going into absorption and float charging periodically, equalizing every few months instead of monthly or never at all. Keeping the bottom and prop clean. Proper selection of prop and reduction.
---In electricboats@yahoogroups.com, <dhennis@...> wrote :
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