allanfisica Posted March 17, 2022 Share Posted March 17, 2022 It seems to be a mistake in sign in the help section of the Performance Ratio https://www.pvsyst.com/help/performance_ratio.htm. In particular the help section shows a weather-corrected PR equation as: PR (corr) = E_Grid / ( PNomPV * Σ hours ( GlobInc / GRef * (1 - muPmpp * (Tarray - TArrayAver) ) While the NREL paper (cited in the help section) https://www.nrel.gov/docs/fy13osti/57991.pdf shows the equation with a diferent sign mainly exchanging (TArrayAver - Tarray ): PR (corr) = E_Grid / ( PNomPV * Σ hours ( GlobInc / GRef * (1 - muPmpp * (TArrayAver - Tarray ) ) Assuming muPmpp is a negative number. I will be happy to receive any feedback on this subject. Link to comment Share on other sites More sharing options...
Michele Oliosi Posted March 17, 2022 Share Posted March 17, 2022 Dear allanfisica, You are right, there is a mistake in the help, we will update the values. Thank you very much for the feedback. This also allowed us to find a different bug in the software that alters the value of the temperature corrected PR by a tiny amount (typically ~ 0.001). We will correct this in an upcoming patch. Link to comment Share on other sites More sharing options...
allanfisica Posted March 25, 2022 Author Share Posted March 25, 2022 Thank you very much for the feedback. I am happy to read that our comment helped. Greetings. Link to comment Share on other sites More sharing options...
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