Influence of I-V Characteristics of PV Cell on Stand Alone PV Power Systems

Abstract

The stand alone PV power generating system usually has a lead acid battery for the loads during the night or a rainy day. The operating voltage of the lead acid battery widely changes from 1.9 to 2.8V. On the other hand, the optimal operating voltage of the high efficiency PV cell is close to the open circuit voltage of the PV cell. The operating voltage of the PV system is not coincident to the one of PV cell in the stand alone system which has the lead acid battery. The system performance is influenced by the I-V characteristics of the PV cell. So, it is clarified by the annual simulation that the I-V characteristics of the PV cell influence the system capacity as well as the operating voltage of the system.