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So have your brother educate the dealer. This is how house battery charging works in a coach.
The Converter / Charger (or in some cases an Inverter / Charger depending on the coch) is powered by 110V to create 12V to power the 12V appliances and lighting in the coach and to charge the house batteries (and in somce cases the chassis batteries). The Charger is also "smart" and changes the voltage applied to the batteries to get them to a full charge and then drops the voltage to a maintenance level.
Shore power provides 110V. The Generator provides 110V. As long as the Converter / Charger has 110V applied long enough to it from Shore Power or the Generator, the batteries will be fully charged..... and maintained.
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