We had a solar panel on our '08 Monaco Dynasty to keep the battery topped off. I'm not sure really how well it worked. Normally, we are pole to pole so really no need for solar for us.
Our current coach, we don't have any solar. We have the generator to run the air going down the road or I can run all four air units off of the inverters as each air is connected to it's own inverter. It does use the battery power so when we 'land', the first thing that happens is the charger kicks into HIGH gear charging the Lithium Ion batteries. If I need air conditioning, I have to be cognizant of the power usage.
The batteries seem to charge quickly and we then resume our regular programming. :p
MM.