I think you've got a good handle on how things should work and I suspect the USE/STORE relay is not working correctly. The inverter does not go through the USE/STORE relay so that explains why the fridge works when on battery power, but nothing else does.
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Ted & Melinda
2016 ACE 27.1
2016 Chevy Sonic Toad - Selling
2020 Chevy Colorado Z71 Trail Runner Toad
2024 Chevrolet Trax 2RS - Soon 2B TOAD
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