Sounds like you've figured out WHAT you want to power... and you've got a good idea for how long.
Now all that's left is decide what your budget is. There are several ways to achieve what you want... each has trade offs.
I could tell you to put 400 watts of solar on your roof - with your low power requirements that would almost eliminate generator use. I could suggest you get two 100AH lithium batteries and the necessary peripherals to support those...
BUT I WON'T... because I don't know your budget. An honest assessment would be to start at bare minimum requirements... then work your way up, deciding if the gains are worth it FOR YOU. When someone tells you that you MUST have a certain setup, ask why... then decide if that makes sense... both functionally AND economically.
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