Our situation.
We have a 80W solar panel flat on the roof of our Class C. Two 6V golf cart batteries and no generator.
All out camping to date has been in BC and AB, so not hot humid places. 80% of our coming is without hook-ups.
We do not use the microwave or an electric coffee maker. We only worry about AC in the South Okanogan and make sure we have electric hook ups then.
We have not switched out our light bulbs, we probably will as the current bulbs burn out.
We have easily gone 5 days in one place without hook-ups, without issue.
We do find that the solar is not as effective when we are North of Calgary. Probably would be better to have a panel that we can face to the sun that far North. On Vancouver Island and in Southern BC it is not an issue.