Comparative study of lead-acid batteries for photovoltaic stand-alone lighting systems
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The lead-acid battery is often the weakest link in photovoltaic (PV) installations. Accordingly, various versions of lead-acid batteries, namely flooded, gelled, absorbent glass-mat and hybrid, have been assembled and performance tested for a PV stand-alone lighting system. The study suggests the hybrid VRLA batteries, which exhibit both the high power density of absorbent glass-mat design and the improved thermal properties of the gel design, to be appropriate for such an application. Among the VRLA-type batteries studied here water loss for the hybrid VRLA batteries is minimal and charge-acceptance during the service at high temperatures is better in relation to their AGM counterparts.
KeywordsAGM-VRLA battery Flooded-electrolyte lead-acid battery Gelled-electrolyte VRLA battery Hybrid VRLA battery Photovoltaic lighting
We thank R. A. Mashelkar FRS for encouragement. Financial support from CSIR, New Delhi, is gratefully acknowledged.
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