[werk_ag]

Of course the value of the "resistor load short-circuit" will depend on the specifications of the photovoltaic cell (as the others too). Personally, with the tested PV cells, I have obtained better results with lower values for the "resistor load short-circuit", resistors between 1 and 1.5 Ohms seems to give the best linearity response.
Personal tests on this matter, are welcome.

Soon we will have a solar module kit available. In those kits, I'm using as Rsh, an 1 Ohm resistor soldered directly to the PV cell. The PV cell used is a 2V, 150mA

Someting like this: