This would have nothing to do with the Inverter, and Inverter only takes 12 volts and inverts it to 120 volts. Since you batteries are actually testing at good voltage, but the panel shows low, I would suspect a loose connection somewhere. It’s good to always post your year with a question but I checked your profile and see you have a 2022. I would start by checking all the connections at the battery terminals, then there is a carpeted box in the compartment just aft of the battery compartment. Remove the screws and pull the cover off and then check all the connections to the breakers and bus bars in there and see if you find anything loose. If you do t find anything there, then I would start looking at your grounds, most should be in the back, up above the trailer hitch or on the left or right side. Mine also had a small bundle of grounds up behind the entry steps, screwed to the frame.
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Brian & Jeannie
2018.5 Seneca 37RB with to many mods to list
2015 Jeep JKU Rubicon
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