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As my battery was getting weak I would find the inverter off and couldn't figure out why. I wondered how to make my battery live longer (though I have to say, this one lasted 3-4 years) I spoke with an Interstate battery tech. He ask if I charged my battery. I said I leave the coach plugged into a 30 amp socket. he said that the onboard coach charger isn't very good and will eventually cook the battery. He suggested that I turn the battery disconnect switch to OFF when I store the coach and charge the battery once a month or so with a battery tender. I now have two 12 volt batteries, with an extension to plug the battery tender in. I leave everything off in the coach, refrigerator, inverter, etc.
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