Solar inverter performance prediction

based on the outdoor PV system of the Renewable Energy Development Center (CDER) at the height of Algiers the instantaneous inverter efficiency under field conditions has been analyzed and compared to manufacturer data. A model is developed that expresses the inverter efficiency as a function of the inverter AC output power. A general efficiency curve is extracted for different SMA/ Sunny Boy 3000TL inverters by applying multi-exponential approximation function. Model parameters are calculated using field data. The model is used to predict inverter efficiencies for different periods of time and compared to the measured ones.