How to calculate Rsh and Rs using the manufacturer's datasheet and if the I-V curves are not provided? I am unable to find the slope as i do not have enough values.
I think some information, such as open-circuit voltage and short-circuit current, can be found on a solar cell manufacturer's data sheet. From this information you can calculate the resistances Rs and Rsh, but the difficulty lies in the fact that these two parameters depend on each other according to the relationships:
Plot the IV data and calculate the slopes at V= 0 J=0 by fitting (or just take the ponit around these two locations) and inverse is the shunt and series resistance .