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VRLA batteries in photovoltaic energy storage systems for telecom applications

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2 Author(s)
Frank, R. ; Accumulatoren Fabrik Oerlikon, Zurich, Switzerland ; Giess, H.

The Swiss PTT has installed an active repeater station powered by a photovoltaic energy storage system (PVES) on the peak Pit Muttler situated in the vicinity of the border corner Switzerland-Austria-Italy at an altitude of 3294 m. The PVES system consists of 72 60 W (4.32 kW-36m2) solar panels with associated maximum power trackers and charging controllers. The photovoltaic energy is stored in 24 V batteries using 2 V VRLA Compact Power cells with a nominal capacity of 1000 Ah (C10) per cell. In order to evaluate the worst case conditions of extremely low temperatures within the battery room, the low temperature (-30°C) and the low voltage (0.00 V/cell) behaviour of such cells is reported. Batteries survive freeze/thaw cycles unscathed and can be recharged with the electrolyte “frozen”

Published in:

Telecommunications Energy Conference, INTELEC '93. 15th International  (Volume:1 )

Date of Conference:

27-30 Sep 1993