I put a 100 watt solar panel on our 20 footer, noting there was easily room for another. It turned out the single one is perfectly adequate for us - no TV, no mcrowave so just lights, fridge, furnace, phones and iPads. It was a Renogy kit with battery controller and cables, the first I saw for $200 delivered to me in Canada. We have never plugged in to AC power or used a generator; the batteries haven't dropped below 80% since getting the solar panel, according to the battery monitor.
As long time tent and tent trailer campers we never even considered bringing a generator camping.
Love the solar!
