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...
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