Check the Thor Tech Forums. You probably have a Transfer switch of some kind that switches from 110 volt shore power to battery power when you are not plugged in to shore power. It appears your tramsfer switch is not transfering over to battery power. Could also be a blown fuse or breaker switch. If your unit has a Battery Isolator switch it could be the fuse or reset on the isolator which would be under the hood by the battery. Hope this helps.
Mel
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