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Germany just now approved new laws that make setting up solar on your balcony super easy
(www.tagesschau.de)
Everything about energy production and storage.
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Do you have a link to some thing like the one that you got?
I would really like a solution like this, not some full on integrated into my house, sells surplus back to the grid kind of solution, just some thing to slightly reduce how much I fall back to the grid for power without insane installation costs would be amazing.
I got my stuff from priwatt. They got most types of solutions. Possibly a bit more expensive than elsewhere, but they handle a lot of the paperwork as well.