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Balcony solar taking off: 1.5M Germans have them there must be something in it
(www.theguardian.com)
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this post was submitted on 10 Feb 2025
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The article says they cost 400-800 Euro and the poster at the top says they generated 380kWh which is about 100 Euro's worth so seems more like 4-8 years. Still likely worthwhile of you can get that and they last significantly longer than 10 years, but not a no brainer everyone should buy.
It depends so much on panel kwp, inverter wattage, orientation, your steady power need, and of course your power tariff.
Best is you take an online calculator https://www.ertragsrechner.com/rechner/balkonkraftwerk