I don’t know if your Quantum has this function, but my Axis and many other Thor RVs have a Battery Control Center (BCC) or BIRD and Trombetta (or similar) that allows shore power and generator to charge the chassis battery and the alternator to charge the house batteries. Store/use switch has to be in Use mode for this to work. In my Axis, the BIRD was miswired at the factory so the chassis battery did not charge under shore power or battery.
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