Balkonertrag
An independent German data platform for balcony solar (Balkonkraftwerke), built end to end as my own product. A yield calculator driven by official PVGIS irradiation data, a live price tracker, a subsidy finder covering all 16 Bundesländer, and city-level market data from the Marktstammdatenregister — thousands of programmatic SEO pages built on real data sources rather than thin filler.
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