I can't specify my measured Rserie as required.

[André Mermoud]

The Rserie specified in the parameters of the module is not the measured Rserie dV/dI, but the intrinsic Rserie of the one-diode model.

It doesn't include the exponential contribution that you see on the graph below.

In the PV module's parameters dialog, the measured value dV/dI, named "Apparent Rserie" is mentioned just below this value in the program.

When the Rserie is specified by manufacturers (as "measured Rserie"), it corresponds to this "apparent" value.

 

I/V curve with Rshunt and Rserie