jdelapena Posted March 16, 2016 Share Posted March 16, 2016 Good afternoon When I create a geographical site I only put as inputs "Horizontal global irradiation" and "Average Ext. Temperature". If I had "Horizontal diffuse irradiation" from a data base, should I put it as input too?I would like to know how PVsyst generate "Horizontal diffuse irradiation". I thought that "Horizontal global irradiation include" included diffuse irradiation, is it correct?Thank you Link to comment Share on other sites More sharing options...
André Mermoud Posted March 16, 2016 Share Posted March 16, 2016 When creating a synthetic hourly data file (from external monthly data), PVsyst uses the algorithm which is included in the Meteonorm program (DLL used in PVsyst). During this process, the program Meteonorm establishes the Diffuse component (from global) using the Perez-Ineichen model (also named DirInt).Now if you specify Monthly values for the diffuse, PVsyst will renormalize the Diffuse computed from the model, in order to get the exact specified Monthly sum. Link to comment Share on other sites More sharing options...
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