I'm out of my depth when it comes to the electrical side of things.
But it sounds like the camping solar panel setup alongside a small battery for storage is what you would be looking for.
I've seen the Coleman? solar panels at Costco as well. I imagine there's a host of small batteries that would work.
You may need to bring the battery pack inside at night, I don't know if they're meant to remain outside 24/7.
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