Evaluation of conductance and impedance testing on VRLA batteries for the Stenter Operating Companies
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Conductance and impedance testing have been proposed in recent years as possible methods of assessing the condition of VRLA (valve regulated Pb-acid) batteries. This paper presents extensive data gathered and analyses it in a number of ways. It includes studying the variance in measurements, correlation with capacity, calculation of 80% cutoff values, box score analysis, investigation of historic trends and intertest-set comparisons. Although conductance and impedance were found to be partly related to capacity, a number of variables and sources of error were identified which significantly affect the accuracy of results. Conductance and impedance testing were found to be a useful aid in identifying good and bad batteries. A number of proposed procedures are suggested for making effective use of these tools.<<ETX>>
[1] D. O. Feder,et al. Field and laboratory studies to assess the state of health of valve-regulated lead acid and other battery technologies using conductance testing , 1993, Proceedings of Intelec 93: 15th International Telecommunications Energy Conference.
[2] G. J. Markle. Variables that influence results of impedance testing for valve regulated cells , 1993, Proceedings of Intelec 93: 15th International Telecommunications Energy Conference.