When you say "CFI" do you mean GFCI?
If it worked before and now trips a GFCI after changing the batteries it's hard to imagine how changing the batteries caused this problem. Especially when it is also the A/Cs that trip it as well, but SINCE THE A/Cs and the thermostat get their control power from the DC buss try this experiment:
Remove the ground side cable from your new batteries and see if the converter trips the GFCI. If not, then see if the A/Cs trip the GFCI.
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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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