A sub panel is the best way to go to truly isolate and prevent persoticic drains. We only boondocks 1 night at a time as we currently have no genset to recharge. I did replace the converter with a Magnum MS2812 inverter/charger. It does power the entire coach. If boon docking overnight I will manually turn off the breakers for anything we are not using. Typically we use the inverter primarily during lunch and pit stops when we have a need for 120v
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