Bob, it sounds a lot like a defective inverter. I got a new 400 watt that would beep for a low battery even while on a fully charged battery. The replcement was fine and I still use it.
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For now 1996 Dodge Ram 5.9 Cummins 365HP 830TQ pulling a 2006 28' Dutchmen Fifthwheel and at times a 16' boat behind that!
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