I used the following equation to extract the parameters of PV module ( multi-crystalline KC200GT) in my last published paper. The given PV module is of 54 cells (Ns =54). How to find the current at a given voltage of an array consisting of modules with N1 model in series and N2 modules in parallel. How to find the equivalent series and shunt resistance of an array if the series and shunt resistance of one module has been extracted?