Those numbers don't sound so unusual to me. Like Bill says, the frig draws a lot of current. That is going to show a big voltage drop at the battery and it's not going to take long to deplete the batterys charge.
In an RV the point of having the DC power option on the frig is for going down the road. Obviously 120 VAC is not going to be available while driving, and running it on propane is a bad idea and also illegal in many states.
While your motor is running the alternator is supplying the power/recharging the battery.
So use the AC or propane while camping and save the DC setting for over the road.
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