I would never rely on solar energy. The sun hasn’t shined here in a week. If you only need to run a refrigerator and freezer you only need a 2.5 or 3.5 kw generator. If you have natural gas use that. If you don’t get a propane tank. Gasoline will go bad and it has all that alcohol crap in it.
I run non-oxy gas in all my small engines. Doesn’t go bad.