Should I install a solar panel on the roof?

The size of your battery bank and inverter determine how large of a current demand you could power and for how long. Running an AC unit will require a very large battery bank and will only be able deliver this amount of power for a short duration leaving you with severely depleted batteries. Solar is always a good idea but it does not run electrical items directly. Solar provides charging capabilities when the sun is shining to restore amphours consumed from your battery bank. A properly sized generator will run your AC and charge your battery bank via your onboard converter. As of yet, we have not made the plunge for solar as we our power hogs and require a generator to fully enjoy the amenities available on our TT while off the power grid.