It would take a battery the size of a Lexus to power a roof air and hotel loads overnight. And a solar panel field that would fit atop a 53' big rig box trailer to recharge the battery just for 12 hours of use overnight. I am going to tour a massive 304 panel co-generation field tomorrow. Three Siemens inverters with a 480 volt output from what I understand. From there it goes to a 120 KV transformer and into the grid. I'll try and get some images if allowed. CFE is pretty strict about that so I can only hope. It is fenced with concertina wire atop 3 meter cyclone and has 4 marines guarding it.