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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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Translated by Google:
This is the coolest part. As I understand it you'll be able to export 500w to the grid without requiring approval of your provider. The new units just plug into the wall and back feed power into your house to reduce your bill.
Depending on how the law is written, I can imagine people putting a battery between the solar and inverter so they could capture more energy and export the maximum 500w all day & night
Lots of people are already doing that. I've seen kits of solar cells and batteries being sold.