Value of Rs

[Giovanni]

Hello my name is Giovanni and I am new here,

I need to make a project for my university and it consists of creating a PV model that spits out the maximum power for given irradiance and temperature, i think i have everything but i am missing a formula for Rs (equivalent series resistance). What i mean by it is that i need a formula that describes how it varies depending on irradiance and temperature in that moment. I have looked on many books and websites but i did not find anything and not even on any forum related to PVsyst, can you guys help me?

Thank you so much

[Michele Oliosi]

Hi,
This recent publication may be useful to you.
https://www.pvsyst.com/wp-content/publications/2023/2023_PVsyst_OneDiodeModel_EUPVSEC.pdf

Actually, we fix Rs according to low-light data, i.e., there is no temperature or irradiance dependence in this parameter.

Let me know if I misunderstood your question !