You may remember I do have a solar array, on these summer days even with all my kit running we are often exporting significant amounts of energy to the grid, so a little science is a good way to use it at home.
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I had a feeling you did. We do have a small panel on our summerhouse with a car battery charging from it. I'm tempted to install a Pi there to do something fun.
Go for it. I dont have a battery solution which us something I keep revisiting, but for a home its still quite a big investment.
I expect that will get cheaper. There should be lots of used EV batteries available in coming years that would be viable for home use.