pvpl

In the help file I read: "When possible, the PV efficiency is calculated according to the operating conditions of the module. Otherwise it is taken as 10%. " In the hidden parameters I find that the 10% has been changed to 15%, but the real question is: what does it mean "when possible"?

Better luck with pvlib-python! 8-)

This is caused by the inverter limiting output, and is normal.

You can find these parameters in the system definition files. https://www.pvsyst.com/help/format_of_pvsyst_files.htm If you would like help automating this, feel free to contact me.