Performance testing of lead acid batteries as a function of depth of discharge and yemperature in photovoltaic application in rural Bangladesh
Agar, A. and Urmee, T.P. (2000) Performance testing of lead acid batteries as a function of depth of discharge and yemperature in photovoltaic application in rural Bangladesh. In: World Renewable Energy Congress VI, 1 - 7 July, Brighton, UK
In this paper, we report the results of short-term tests on three types of stand-alone systems. These tests are carried out in Grameen Shakti's laboratory. According to the battery manufacturer depth of discharge affects the life and performance of battery. The battery performance also depends on the temperature. Deep cycle batteries have been tested for a number of combinations of depth of discharge and temperature. The tests are carried out to find the depth of discharge at different temperature. For flooded lead - acid batteries the water loss is directly related to the state of charge in the battery. In general, higher the state of charge corresponds to greater water loss. Allowance of this water loss needs to be included in system design or maintenance plans. The experimental results show that the life of the battery depends on depth of discharge and is also affected by the temperature. The cycle life of the battery significantly reduces at higher temperatures. Also the process contributing to battery degradation is generally enhanced at these temperatures. Considering the environmental condition of Bangladesh the battery should be used down to 60% or below discharge for better performance.
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