SMU01C
User Manual
6 VRLA Battery Management
Issue 03 (2015-01-05)
Huawei Proprietary and Confidential
Copyright © Huawei Technologies Co., Ltd
15
6
VRLA Battery Management
6.1 Battery Charging
If the AC input to the power system is normal and meets load requirements, rectifiers supply
DC power to loads and lead-acid batteries. If the AC input to the power system is abnormal or
rectifiers cannot supply DC power, lead-acid batteries supply power to loads. After the AC
input or DC output is restored, rectifiers supply DC power to loads and lead-acid batteries.
6.1.1 Float Charging
Principles
Lead-acid batteries discharge slowly when they are being used. To compensate for the loss
caused by self-discharge, charge lead-acid batteries in float mode to ensure their full amount
of electricity. Float charging also helps to maintain battery capacity after a large amount of
electricity is discharged.
Parameters
Table 6-1
Float charging parameter description
Parameters
Description
Default Value
Value Range
FC Volt
The voltage at which
VRLA batteries are
charged in float
mode.
53.5 V
47.0 V–56.5 V
≤ Boost charge
voltage
