5.0 APPENDIX
56
©2000 Xantrex Technology Inc.
Selection of a Battery Type
(continued)
NiCad and NiFe Batteries
Trace inverters and battery chargers are optimized for use with lead-acid batteries having a
nominal 2.0 volts per cell (i.e., 6 cells for a 12 volt system, 12 cells for a 24 volt system and 24 cells
for a 48 volt system). Alkaline batteries, such as NiCads and NiFe types, have a nominal cell voltage
of 1.2 volts per cell. The number of cells required in a battery bank for alkaline batteries must be
adjusted for a 12, 24 and 48 volt system (i.e., 10 cells for a 12 volt system, 20 cells for a 24 volt
system and 40 cells for a 48 volt system).
Alkaline batteries require a higher charge voltage to fully recharge and drop to a lower voltage
during discharge compared to a similarly sized lead acid type battery.
Another option for 24 volt (only) alkaline battery banks is to use only 19 cells instead of 20. This
allows the battery charger to operate closer to the settings used for lead-acid batteries. However,
the battery voltage will drop to as low as 18 volts when discharging the batteries.
Consult the battery manufacturer or supplier regarding system requirements and battery charger
settings for alkaline type batteries.
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