Refrig AC cooling does run on 110V AC heating unit instead of gas flame. Therefore low voltage will affect it, and does(been there, done that). In worst case, run refeer on gas. It will still use 12V for control circuits, but should cool a lot better. Again, remember that the hotter it is outside, the less efficient cooling you will have. Takes energy to cool when its hot, takes energy to heat when its cold. go somewhere in between to use less. But then, it takes energy to go somewhere else also. Any way, we lose!