Abstract
The standard procedures for photovoltaic (PV) system sizing consider a representative value for autonomy based on the solar irradiation of the given location and the load consumption. However the post charging and discharging events that occur after the defined autonomy period were seldom considered in the earlier studies. This technical note appraise the application of a proposed simulation model of a standalone PV system, evolved from an hourly performance model, system which can simulate the module output along with battery charging and discharging cycles during the post autonomy hours of system operation. Based on the yearly irradiation input, the simulation model can predict the minimum time duration (hold time) required for the PV system to prepare for the load between two consecutive low irradiation cycles. All the simulation codes were developed in Matlab (r2010a).The result shows that the success of any stand alone PV system with autonomy d>1 strongly depends on the irradiation cycles of the location, and autonomy considerations would help save the system requirements up to 15% .The applicability of the proposed autonomy model is described and validated using a real time example of a refrigeration system.
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