The RV I'm buying has an Automatic Transfer Switch that selects shore power or generator with preference for shore power. If I add a solar system is there an ATS that has three inputs (shore power, generator, or inverter)??? Or, do I just leave the present inverter wired as it is? The RV has a residential refrigerator and uses house batts through the inverter. Will's videos assume any solar system build would replace the existing generator. I want to keep the generator to run the AC units while boondocking.