I had a similar issue. Was pulling my hair out, looking at new batteries and a new inverter. It ended up that EVERY connection on the input side of the inverter was so loose that I was able to get several turns by hand without contacting the cables. Check all of your battery cable connections to make sure they are tight, and every connection between the batteries and inverter. CHECK THEM ALL, tighten them appropriately. And BTW, now my residential fridge will run for 2 days on my (3) 12V batteries without a E01 or E02. I was seriously ready to throw out the res fridge also, now wouldn't trade it.
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Dan S.
2015 Thor Chateau Super C 33SW
F-550 Chassis, 6.7L Powerstroke
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