Depends on your RV and how many batteries you have. Not to mention solar. If you have 4 X 6 volt batteries and a 300 or 400 watts of solar you can pretty much leave your fridge on indefinitely when in storage. Modern residential fridges don't use a lot of power. Ours uses less than an amp and a half and that is only when its cycled on which is about a third of the time. Dry camping you should have a little more solar for the rest of the coach. Solar is cheap now a days. We have no problem dry camping but we still run our generator when we use our microwave or toaster or coffee maker for any amount of time. Those are bigger loads. In bad weather our biggest loads are the TV's and computer which get a lot of use if we are couped up inside.
Cheers.
