tolga Posted November 24, 2015 Share Posted November 24, 2015 (edited) Hello, I have a trouble about sizin array. There is a difference in operating conditions between calculated by PVsyst and me.For example, I calculate operating conditions; Voc(-10) = Voc,stc * (1 + (Toc-Tstc)*b); b is Temperature Coefficients of V, for selected panel b is -0.31 %/C so;Voc(-10) = 37.7 * (1 + (-10-25)*-0.31%) = 41.79 V likewise Vmpp (60C) = 27.10 V.Calculated operating conditions; Voc(-10C) = 835.8 VVmpp(60C) = 542 VThere is a dramatic difference, especially for higher temperatures. I can't figure out what is reason.System Design by PVsyst Edited December 1, 2015 by tolga Link to comment Share on other sites More sharing options...
André Mermoud Posted November 29, 2015 Share Posted November 29, 2015 The Voc is computed according to the one-diode model. However the temperature coefficient is not quite linear with the temperature. On the other hand, the values of the one-diode model are not necessarily conpliant with the value specified in the datasheets. Please see our FAQ How to adjust the Voc temperature coefficient ?. Link to comment Share on other sites More sharing options...
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