According to PVSyst's manual:
"the I/V characteristics of the partially shaded sub-module is evaluated (10% cells shaded for 1 corner shaded, 1/3 for 2, 2/3 for 3, 100% for 4 corners). It is again an approximation, but when inserted in the I/V full array characteristics the electrical effect is about the same as soon as the sub-module is shaded."
Full Calculations steps: http://files.pvsyst.com/help/near_shadi ... trical.htm
I wanted to know what the 10%, 1/3 and 2/3 (in step 2) meant with reference to IV characteristics?
P.S any explanation or further information on how PVSyst's calculation method would be much appreciated as I'm not sure I fully understood it.