Let's say your refrigerator uses 7 amps. That is 840 watts.

My guess is that the array of solar panels just to keep pace with the most basic loads would need to provide 1500 watts because on our coaches we have a lot of "key-off" loads ranging from tank level sensors, to the alarm system, to clocks, outside thermometers, to the water pump etc.

Of course you could get away with less wattage if you set your charge time to the night when loads are less.