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The real answer is I do not want to go to town today to find some batteries I have a pair of 75AH flooded batteries but they aren't the correct size. * BustedI had one of the batteries in my deuce go bad on a trip, Like only put out 2 volts bad. If a single battery could spin over and start my deuce on a cold morning, I don't see why it couldn't spin over a genset.
The real question is why do you want to start it on 12v?