Chuckster is right! Your panel will read full charge while the generator is running and powering the convertor which is providing 13+ volts to the batteries. The fridge wouldn't run down a charged battery overnight, but the furnace fan or something like that would.
If nothing else was running then you likely didn't have a full charge on the battery to start the evening with.
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2017 Cougar 279RKSWE
2007.5 Dodge Ram 2500 6.7 Cummins
Retirement Training Completed
I think the little voices in my head have started a chat group.
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