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Explore a 29-minute conference talk from the 38th Chaos Communication Congress that delves into the development of openpv.de, an open-source website for calculating photovoltaic potential of buildings. Learn about the integration of open geodata, including 3D building models, laser scans, and elevation data from German governmental sources, and discover how these datasets enable browser-based solar potential simulation. Follow the journey of implementing physics-based solar irradiance calculations using WebGL, understanding the challenges faced during development, and how the project evolved from a hobby project to receive funding from the German Prototype Fund. Perfect for those interested in solar panel installation, open geodata enthusiasts, and developers curious about browser-based 3D simulations.