Propane usage would be very low as the fridge door will be closed for that period. (Unless outside temps are ultra high). As far as 12 volt consumption, your fridge is ignited by a DSI system which will use little to no power. With a good set of battery/s your service from them should last for at least a week or two. Been there done that for longer periods and had no problems. Your CO and propane monitors will likely consume more power then the fridge DSI.
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