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2-4 years is the usually all that can be expected from factory wet cell batteries . 4 years would be if they get excellent care( checking and adjusting each cell fluid level with distilled water every 4-6 months and maintained charge) . Looks like you may be boiling out a cell on the battery due to low fluid during charging. In any event they are end of life and not under warranty. Replace them , decide if you want to switch to no maintenance AGM or jump to lithium to power that inverter better. I would still confirm that the converter if putting out charge voltage and the bcc is charge voltage to batteries when coach running. Good luck.
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2015 Solera 24r
2017 Jeep Wrangler
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Linear Mode
