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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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Yes with a grid tie inverter it's pretty much that easy. But doing it yourself this way can be dangerous to electricians who thought they cut the power. If the "island protection" on the inverter fails to disconnect the inverter after the lid of power those wires could still be hot.
What's interesting about this is that you don't have to necessarily pull permits for electrical work, as nobody is running conduit or attaching to electrical panel.
Im grandfathered into an old solar rate plan, and if I change the system or add more panels I'll lose that privilege. However, if I don't have to tell the city or utility anything, that opens the door for expanding with balcony solar panels.
I would hope electricians would always double check the line they're working on regardless.