[GIS] Calculating total PV potential of roof using QGIS

calculate-valuesqgissolar radiation

I want to calculate total PV potential of a roofs in a certain area. To do that I made a dsm, ran SAGA "Potential Incoming Solar Radiation" algorithm (just playing with it only for now – I need to work out how to obtain proper values) and cut the output raster to vector with a roofs outlines.

As a result I received nicely cut raster that fits to size of each roof, as visible on image below.

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What tool should I use to obtain exact value of irradiance for area of individual roofs?

To be more accurate: not only visualize distribution of irradiance on the roof but exact number of kWh/sq m for given area?

Best Answer

Have a look at this tool: SEBE (included in the UMEP toolkit, which has recently been added to the QGIS official plugin repository). As described in the official site, SEBE (Solar Energy on Building Envelopes):

... can be used to calculate pixel wise potential solar energy using ground and building digital surface models (DSM). SEBE is also able to estimate irradiance on building walls. Optionally, vegetation DSMs could also be used. The methodology that is used to generate irradiance is presented in Lindberg et al. (2015).

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