I think 3 days on a single battery and charge is quite good. The fridge running on battery alone will use up power running the electronics, also, do you have a rechargeable flashlight that came with your rig? If so,I think that also uses 12v to charge itself. Did you use your water pump too? You could be right with the odor coming from the w/d drain. Get some water in the trap or cap it off if you are not using it.
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