JOURNAL OF OPTOELECTRONICS AND ADVANCED MATERIALS, cilt.15, ss.550-554, 2013 (SCI İndekslerine Giren Dergi)
Conversion efficiency of DC/AC inverters depends on some parameters and fluctuates over the input power of the inverter. Since the PV inverters operate under a fluctuating input power supplied by the PV modules, conversion efficiency must be measured against the weights of the probable power ranges which represent the various irradiation values. This approach of having different weights for different irradiation ranges resulted in two basic weighted conversion efficiency models of eta(EURO) and eta(CEC). These two models consider the irradiation distribution over the whole annual sunny time and prioritize the ranges with various weight factors. Since the irradiation profiles vary around the planet, inverter efficiencies must be evaluated against local irradiation profiles to get more precise annual energy yield estimation. This paper presents eta(IZMIR), a weighted conversion efficiency evaluation model, derived from the Izmir irradiation profile. This model has been developed in a way that it should be simple and accurate so it has been matched with other models for its estimation capabilities. The results are discussed here and suggestions being made.