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Real time VRLA life test or how a small difference can have big effects

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1 Author(s)
Giess, H.K. ; Oerlikon Stationary Batteries Ltd., Aesch, Switzerland

Stationary lead acid batteries can experience temperature differences within a string especially when operated as 110 V or 480 V back-up batteries. In the present study the influence of a ∼3°C temperature difference on the corrosion induced capacity loss of VRLA monoblocs during 7 and 9 years of float operation in a 5 tier rack installation is reported. Corrosion sensitive VRLA monoblocs can have residual capacity values ranging all the way from 3% to 110% in the same string due the cumulative influence of such minor temperature differences. VRLA cells and monoblocs in which positive grid corrosion has been designed-out as main failure mode, show a much more robust performance under these adverse conditions.

Published in:

Telecommunications Energy Conference, 2004. INTELEC 2004. 26th Annual International

Date of Conference:

19-23 Sept. 2004