[atreis]

Solar panels CAN help a lot. I have 320 watts of solar on my roof (configured into two 24V arrays with an MPPT charge controller) because we do extensive several-week-long trips to places without hookups where we will also need to be able to run the furnace. That's pretty extreme though. On my old trailer I had a single 115W panel - that worked pretty well for keeping the battery charged most of the time (except for deeply shady sites) so long as we didn't use the furnace. Anything less than 50 watts isn't going to do much for you.