We run our a/c when it's hot. How long depends on how warm it is, how much sun the panels get etc. Our panels make about 70AH in good sun and the A/C uses about 100 with the compressor running and 30 with just the fan motor blowing. Mid 80's and sunny it will run all day with good reserve cycling the compressor. 90's with the compressor on 100% still all/most day but low battery heading into the night.
We don't run it that often. When it gets that warm it's time to head into the mountains. These rv roof units are not the pinnacle of efficiency, nor are campers well insulated to begin with.
