bvanvooren Posted July 31, 2014 Share Posted July 31, 2014 report Hello,I get lost with the PR calculation in the report.E_grid = 261.1 MWhPnom = 250 kWpGlobEff = 1137.5 kWh/m²PR = 261.1/(250 x 1137.5) x 1000 = 91.8%Report shows 85.6%Please help?Best regards,Bart Van Vooren Link to comment Share on other sites More sharing options...
André Mermoud Posted July 31, 2014 Share Posted July 31, 2014 The performance ratio is referenced to the GlobInc (irradiance in the collector plane without optical losses), not GlobEff which includes the shading, IAM and soiling losses. See How is calculated the PR ? Link to comment Share on other sites More sharing options...
bvanvooren Posted August 1, 2014 Author Share Posted August 1, 2014 indeed.Thanks! Link to comment Share on other sites More sharing options...
Erick Castro Posted January 25, 2017 Share Posted January 25, 2017 Frequently I need to know what is the "Perfomance Ratio P90", as well the P90 of Global Incident irradiation over the collector plane.Does the PVsyst evaluate these values automatically in any version?What formula/equation could be used in the case of "Perfomance Ratio P90"?Anything like PR_P90 = E_Grid_P90 / (Glob_Inc_P90 * Pnom) ???Regards,Erick Castro. Link to comment Share on other sites More sharing options...
André Mermoud Posted January 30, 2017 Share Posted January 30, 2017 This requires that you avail of data about the yearly variability of the meteo data for your site. You have a complete explanation about the P50-P90 concept in the Help "Project design > P50 - P90 evaluations" Link to comment Share on other sites More sharing options...
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