I never liked Onans, We call them O-no-s in the shop cause they suck, parts are way over priced and they are built as cheap as they come, 20 years ago they built good units now its just a popular name, how can they sell a power generating plant that is not self contained and a parasitic load on another system, I know its not too big a deal to plug in a charger off the ac side but they should have that built in for the bux they charge .... Sorry guys I don't know where that came from