Abstract
The optimum operating conditions of solar cell modules for photovoltaic systems have been studied by acquiring complete field operation data for two kinds of modules during a period of more than 1 year. The annual output energy from a CZ Si solar cell module under maximum output conditions is 1284 Wh/Wp/year and that of an EFG ribbon Si module is 1117 Wh/Wp/year in Osaka, Japan. The difference between the annual output under fixed voltage operation and that under maximum output operation conditions is 31.35 Wh/Wp/year for the CZ module and 41.44 Wh/Wp/year for the EFG module, respectively. If the operating voltage is adjusted every month to the optimum value, these differences can be greatly reduced to 15.42 Wh/Wp/year (CZ) and 20.29 Wh/Wp/year (EFG). It has been shown that an optimum operation of a solar array can be realized by adjusting parametric changes in the photovoltaic performances using the cell temperature and insolation intensity.
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