I am looking for a free application/tool/plug-in to conduct solar potential/irradiation analysis on a 3D city model. My intention is to know how much solar energy is delivered onto the rooftops and facades of certain buildings. Once I have the information about the solar potential of buildings, I need to overlay this information with various 2D layers in GIS.

closed as too broad by PolyGeo Jul 2 '17 at 22:04

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I've not used it myself so can't offer any advice on it, but Saga Potential Incoming Solar Radiation might be of help

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