tafadzwa Posted October 6, 2016 Share Posted October 6, 2016 Hi I would like to know how PVsyst calculates DNI values if give a weather data file that contains GHI but does not come with DNI. If it is indeed the case that it uses the Erbs model (DNI = (GHI - DHI)/cos(Z), where Z is the zenith angle), I would like to know how PVsyst handle cases where the zenith angle is 90 degrees (or relatively close to that). Also, is there a way of exporting PVsyst's calculated DNI? It appears the only meteo data closest to DNIthat one can export is the Horizontal Beam Irradiation. Link to comment Share on other sites More sharing options...
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