The refridgerator draws about 100watts when running but how much it runs depends a lot on how much you have the door open. If you work at keeping the door shut it should not be too much of a problem. Keep in mind that the large light fixtures are 20 watts each and the small ones are 10 watts each. The coach is very well lit but you could easily have 200-300 watts of lights on. That is why I made the investment in LEDs. They reduce the power draw by about 80%. Also, keep a close eye on the storage compartments. It is very easy to shut one with the light on. My coach and at least one other had the light under the hood left one at the dealership. I think that with a little care you should not have any trouble even with the standard lights but the LEDs would give you an extra margin.