Depends on how much you camp off grid and how much seasonal sunlight is typically available.... We camp mostly off grid, and have two 6v batteries wired in series...
I started out with 200w but decided that more was needed due to occasional inclemate weather conditions, so added another 100w and found this to be generally acceptable depending on how long the poor weather last...After that I fully automated our electrical system to make DW happy and a passive hotel like (120v) off-grid experience using a high power sine wave inverter. Quite naturally, our electrical usage went up a bit so I added another 140w.....For now this amount (440w) works well as our sweet spot...
So lots of variables depending on the user, but my advice is to always err on the high side, and plan on wiring sizing for future needs...JMO
3 tons
