This is an issue for everyone that does any dry camping. I have a camp trailer equipped with 2 100 Ahr batteries in series. In the summer time, long days, warm nights, I find I can go almost a week without charging, the primary electricity usage being the water pump and maybe a brief use of the heater to take the chill off in the morning. In colder seasons I might only get 2 - 3 nights out of a charge.

I have a generator and lug it along on every trip longer than a weekend but it is truly a PITA. Heavy, noisy, smelly, and generally not conducive to quiet contemplative camping. This year I think I am just going to buy two more RV batteries and built a box to carry them in the bed of my pickup. I will charge them up at home and just swap batteries in camp. I should be able to greatly reduce the number of times I have to put up with the generator.

Just another possibility if you generally do short stay trips.