Hello Inno-Energies! Im trying to model PV cell behavior under concentrated light for c-Si solar cells. I am using the four parameter model where I determine (Io, Iph, Rsh,Rs, diode ideality factor). I am struggling to estimate the Rs and Rsh. Any suggestions for how I can easily determine these two parameters? I am using Pvlib to plot the characteristic I-V curve.

Hello! Thanks for asking this question. I believe it would be enough for you to check your answer in PVEducation: Series Resistance | PVEducation and Shunt Resistance | PVEducation. They also provide you a basic calculator to determine the values for the resistances.

Moreover, the slope of the linear region at the Voc intersection gives you the series resistance, while at the Isc you can determine the Shunt resistance. This is possible if you have given data for the curves. Both values may be approximations if the curve is not perfectly linear due to other effects connected to particular material impurities.

I hope I answered your question, otherwise I can go more in details.