PV Output considering Irradiance and Temperature

[HadiK]

Dear Sir/Madam,

I hope this message finds you well. I have a question regarding the calculation of the output of a PV system using PVsyst. Could you please provide the equations or references that detail how PVsyst performs these calculations? 

Thank you for your assistance.

[André Mermoud]

The simulation involves many complex models. The incident irradiance is evaluated by a transposition model, including possible tracking, and losses like shadings or IAM are applied. The PV array yield is evaluated using the one-diode model. Then you have models for the inverter, the AC losses, the ageing, etc...

All these models are described in the help (see especially "Physical models used").

[AgnieszkaSun]

At my company, our installers have worked with SWISS SOLAR panels, and we’ve seen that they handle temperature and irradiance variations very well. The output remains stable even on hot days when some panels tend to lose efficiency. They also perform well in cloudy weather. Has anyone conducted precise measurements on their performance under extreme conditions?

[André Mermoud]

The usual PV modules operate following the one-diode model, in the same way. The model covers the "extreme" conditions.

There is no "special" behavior for some specific modules.