sounds like your battery is not getting charged, which should be happening while you are plugged into 120v Shore Power. I don't know what an '19 erd' is, but it most likely has a Converter, which includes a battery charger, built into the same unit at the Main Electric panel/Fuse Panel.
So, if it's not getting power to the Battery Charger/batteries, then you're 12v usage will continue to deplete the battery, even when you are not 'there', as there are sometimes 'phantom' draws that continue. The air conditioner's Thermostat is most likely 12v, the Fridge is most likely controlled by 12v, etc.
also, as a side question. You say you 'turn OFF the water pump when you are not there', but are you not hooked up to a spigot for water?
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...2014 Ameri lite 259BH...
the Turners...
two Campers, two Electric Cars
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