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Assessment of Series Resistance Components of a Solar PV Module Depending on Its Temperature Under Real Operating Conditions

Among the physical parameters of the standard single diode model of a solar cell, series resistance is one of those that strongly affects its performance. Contradictory changes in series resistance depending on temperature were reported in the literature. Accurate measurements of I-V characteristics were taken under different real operating conditions at constant temperature and solar irradiance, using a high-performance I-V curve tracer. The experimental results were used to determine series resistance of a photovoltaic module using two extraction methods. Empirical laws of series resistance components depending on module operating temperature were cheeked. It emerges that of the seven series resistance components, only four essentially determine its value.