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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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Should not be an issue. The inverters that feed into the grid need to follow the phase and frequency of the grid. If the grid is down, there is nothing to follow and it will not feed any power into the grid.
I think an approved set of solar panels and inverters will be able to streamline the process for sure and help quell concerns of electrical worker and grid safety.