Howdy. We had friends in a similar situation and explored some of the options you are presently exploring. They chose to buy a 200 watt portable solar panel to just cover their extra power needs. He said the only thing that came up was they were in one spot in the trees that made it hard to get the panel in the sun. He bought an extra 25 foot extension cable for the panel and problem solved. He had to move the panel around during the day to keep it in the sun but said it wasn’t an issue and the grand kids actually caught on to it and made it their duty. A learning situation for the grand kids as well.
Hope that helps.
Cheers.