about PV module ageing parameters : Imp/Vmp contributions

[Chen]

Dear PVsyst team：

 For the Imp/Vmp  contributions 80/20%， is there any relevant literature to support the value of this parameter? Thank you！

[André Mermoud]

You can find some data about the current and voltage degradation in the works, namely, of the TISO in Switzerland. 

For example in this publication:  https://www.researchgate.net/publication/256080133_TISO_10_kW_30_years_experience_with_a_PV_plant