A Method to Determine Battery Charge/discharge Resistance in Stand-alone Pv Power Systems
نویسنده
چکیده
This paper presents a method to determine the internal resistance of a bank of deep-cycle lead acid batteries that are part of a stand-alone photo-voltaic system. Both the charge and discharge resistances are calculated as a function of the state-of-charge (SOC) of the battery from daily variations in battery terminal voltage as well as charge and discharge currents. The method is illustrated by some field data collected from a PV-powered air monitoring system over several days. The example confirms the fact that the both the charge and discharge resistance are dependent on the battery SOC. Key-Words: Deep-cycle batteries, battery charge/discharge resistance, stand-alone photo-voltaic applications.
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