Discharge Characteristics For Lead-Gel Battery Modules - Siemens SITOP DC UPS 6EP1931-2DC21 Considerations For Use

6.2 Discharge Characteristics for Lead-Gel Battery Modules

Diagram 6: Discharge characteristics for lead-gel battery modules
Definitions: DISCHARGING CURRENT = Output or charging current of SITOP DC UPS module
Ordinate = Battery voltage in V, abscissa = discharging time in seconds/minutes/hours
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© Siemens AG, 2009
5C means: Charging current = 5 x battery capacity x 1/h
(i.e., in case of a 3.2Ah battery module, 5C is a charging current of 5 x 3.2Ah x 1/h = 16A)
3C means: Charging current = 3 x battery capacity x 1/h
(i.e., in case of a 3.2Ah battery module, 3C is a charging current of 3 x 3.2Ah x 1/h = 9.6A,
while, in case of a 7Ah battery module, 3C is a charging current of 3 x 7Ah x 1/h = 21A)
1C is particularly easy:
for a 7Ah battery module, or 12A charging current for a 12Ah battery module).
0.2C means: charging current = 0.2 x battery capacity x 1/h
(i.e., in case of a 12Ah battery module, 0.2C is a charging current of 0.2 x 12Ah x 1/h = 2.4A)
and so on
3.2A charging current for a 3.2Ah battery module, 7A charging current
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