For our use in the Northern U.S., 2-100 ah lithium batteries and 4-100 watt solar panels is a bit more than what we need. Spent a couple months traveling to Alaska and back last year, and didn't need to plug in the entire trip. We didn't have a generator. The batteries didn't charge from the truck either, as I have that wire disconnected. We did plug in a couple nights at campgrounds to run the a/c when it was too hot for us.
Our typical daily power usage:
- watch tv for 2-3 hours at night
- lights
- water pump for showers and stuff
- electric compressor fridge
- listen to music for an hour or so in the morning
- 3 or 4 cups coffee Keurig on the inverter every morning
- wife dries hair on the inverter every morning
Typically the batteries are at 60 - 70% in the morning before the solar starts charging them back up.