i also have a balcony module at home. but it doesn't help in the event of a power cut because the system needs electricity to produce power. It would work with a battery, but that costs too much and makes the whole thing uneconomical.
By the way, as of yesterday, all newly applied-for residential buildings must be equipped with a solar system (Germany).
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Germany was always ahead on sustainable technology. I hope your panels are serving you well. The UK could have a lot more domestic solar.