New equivalent diagram of solar cells (engineering point of view)

Abstract

The disadvantages of the equivalent diagram of solar cells in use today are analyzed. The experiments include measurements of solar cell output characteristics under normal operation conditions and also under conditions where the solar cells operate under positive and negative overvoltages. An analysis of the experiments has suggested a new equivalent diagram based on a d.c. voltage source which gives a good approximation for the whole output characteristic of a real solar cell under normal and abnormal conditions. Comparison of the experimental data and results of the theoretical and numerical analysis shows that the suggested equivalent diagram of solar cells may be very useful for analysis of processes in large d.c. systems based on solar cells.