EVALUATION OF PHOTOVOLTAIC SYSTEM IRRADIATION FOR EFFICIENCY AND VARYING TEMPERATURE EFFECT VIA MEASUREMENT

This paper deals with valuating the experimental performance of 46MWh solar photovoltaic system which was designed, developed, sized and installed at multicomplex building of health centre, Obodo Ahiara, in Ahiazu Mbaise local government area, Imo State, Nigeria for converting abundant sunlight natural energy resource directly to electricity. The performance characteristics of the modules are valuated experimentally in terms of their response variables open circuit voltage (Voc), maximum voltage Vmax, short circuit current Isc, maximum current Imax, maximum power Pmax, and efficiency ???? as a function of difference irradiance values of 400W/m2 , 450W/m2 , 500W/m2 and 600W/m2 for a period of 30 days in the month of January, 2018. These response variables are generally observed hourly to be directly proportional to irradiance with significant decrease in efficiency, Vmax, and Voc and Fill factor FF. Maximum efficiencies of 11.23% and 8.27% are achieved at irradiance of 500W/m2 for the module 1 and module 2 respectively. The maximum power outputs obtained at irradiance of 500W/m2 are 15.39 W and 22.65 W representing 30.78% and 45.3% of the manufacturer's power specifications for the PV module 1 and module 2 tested respectively. The hourly daily measured total and average temperatures vary from high values of 345.400C (43.180C), 310.100C(38.760C) and 306.000C(38.250C) on the 1st, 3rd and 4th days to low values of 272.400C(34.050C) and 290.500C(36.310C) on the 5th and 2 nd days.