Converter not inverter (inverter makes 120V from 12V, converter makes 12V from 120V).
Check your converter it may be bad. Sometimes they boil the batteries by overcharging them.
Try unplugging it and turning everything off...see if the batteries last longer.
Our 24.1 is 8 years old and still has the OEM chassis battery (yup just Jinxed myself). It still starts the coach just fine.
I put disconnects on both the chassis and house batteries. In storage both are completely disconnected.
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