Jamie,
I read an article in MH magazine that discussed using the alternator as a charger while parked. It said engine RPMs need to be about 1500 for the alternator to work at peak performance. It will need to run for about an hour to charge house and chassis batteries fully.
It also made the point that doing that was a whole lot more effective than using the genset and converter for the same purpose. If I remember correctly they claimed that a full charge on all batteries took about the same amount of gas either way, and a lot less time using the engine.
Randy
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