Nicolas A

Good morning M. Mermoud, Thanks for this answer, this is complete and accurate. Bonne journée à vous, Nicolas

Hello, M. Mermoud, First of all, thanks for you quick and accurate answer. Indeed PR calculation is specific and I have used EarrRef and Earray values for it, not EarrNorm. I am still surprised of the PR value, because the Sunpower X21 345 is supposed to be great for low-light efficiency. Moreover, the Rserie resistance itself is lower for the X21 345 (0.39) than for the E20 327 (0.435). I might have not understood some parameters and I still not understand this PR issue (-0.5% for X21, for two simulations, in Cadarache and Freiburd). Yours faithfully, Nicolas

Good morning M. Mermoud, I have done some simulations on PVsyst 6.35 to calculate PR and I am surprised of a result: Sunpower E20 327 gets a better PR than Sunpower X21 345 for the same experimental protocol. Anyway, X21 should be better than the E20, but here X21 has got more irradiance losses than the E20. One explanation might be the influence of "efficiency per cells area" for PR calculation. Indeed, it values 82% for Panasonic HIT-N245 and only 23.44% for sunpower 327 and 22.3% for sunpower 345. Is it the reason of the PR difference I have explained before ? By the way, this characteristic is "N/A" for SolarWorld 255 and 280, so is it mechanistically considered equal to 100% in this case ? Thanks a lot for this software and for your support. Yours sincerely, Nicolas