Stationary tubular plate lead acid batteries which pass the C10 test in the laboratory sometimes fail at site when used in solar photovoltaic applications. A lot of cases of batteries not getting recharged or not lasting out the long warranty of 5 years are reported.
The same design battery works well in a UPS application though the current drawn is higher, since UPS batteries are used generally for 3 to 5 hours despite being rated at the same C10 capacity.
Stationary batteries used for UPS as well as solar applications are both made with Tubular Positive plates and Pasted Negative plates. At times the operating specific gravities of electrolyte used, are also the same. As and when stationary batteries are made in SAN transparent containers, we observe that the recommended specific gravity of operation for both UPS as well as Solar Photovoltaic use is 1.240.
Why do the batteries fail in solar photovoltaic use?
In this episode of my podcast, I have outlined as to what needs to be done to make a good stationary battery for solar photovoltaic application.
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