Granted we live in ours full time, but we have 3 AM Solar solar panels and 4 AGM 6-volt batteries and never run out of power.
99% of the camping we do is off the grid type boondocking and would be impossible or uncomfortable without the Solar Panels.
If you only camp a few times per year, a nice bank of Deep Cell batteries and one panel would probably suit you fine. I dont think the expense of the full array would pay itself off for the part timer.
This is what I hope to move up to soon:drool: