The other thing to check is if Thor’s cheap converter/charger is actually working as it should. After a couple of days with the coach plugged in to shore power and the use/store in the use position, check the voltage on the house batteries with a volt meter. The charge should read around 13.1v which indicates that the converter/charger has stepped down to the maintenance charge mode. If the volt meter reads around 13.5v, then the charger has not gone into the maintenance mode, as it should. If you continue to leave the coach plugged into shore power with a 13.5v charge, you risk boiling off the electrolyte in the batteries and ruining them.
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