Extraction of equivalent circuit parameters of solar cell: influence of temperature

A new method to evaluate the five parameters of illuminated solar cells is described. The method is based on nonlinear least squares approach. On calculating the lsqcurvefit-function with constraints, between the experimental current-voltage  I(V) characteristic and a theoretical arbitrary characteristic based on Lambert W -function. The used model is implemented as a MATLAB ® script which yields the  I(V) characteristics of the LILT under test. The model has been validated against by applying it to experimental I ( V ) characteristics. Some parameters of the model have been measured directly whereas others have been evaluated by means of direct computation on the data sheet or by means of best-fit on the measured data. The results have been compared and an analysis of the errors is presented.