Powerbox F series User Manual
9
2.4 Battery Management System(BMS)
2.4.1 Voltage Protection
Discharging Low Voltage Protection
：
When any battery cell voltage is lower than the Rated protection value or total voltage below 42V
during discharging, the over-discharging protection starts, and the battery buzzer makes an alarm
sound. Then battery system stops supplying power to the outside. When the voltage of each cell
recovers to rated value and total voltage restored to above 45V, the protection is released.
Charging Over Voltage Protection
：
When charging, the system stops charging when the total voltage of the battery pack is higher than
54.75V or the voltage of any single cell reaches the protection value. When the total voltage
returns to below 52V and the cell voltage returns to below the rated protection value, the
protection is released.
2.4.2 Current Protection
Over Current Protection in Charging
：
When the charging current is greater than the protection value 55A, the battery buzzer alarms and
the system stops charging. After the system delays the rated time for 1min, the protection is
released.
Over Current Protection in Discharging
：
When the discharge current is greater than the protection value 55A, the battery buzzer alarms
and the system stops discharging. After the system delays the rated time for 1min, the protection
is released.
Note:
The buzzer sound alarm setting can be manually turned off on the background software, and the
factory default is on.
2.4.3 Temperature Protection
Less/Over temperature protection in charging
：
When battery’s temperature is beyond range of 0
o
C~+55
o
C during charging, temperature
protection starts, device stops charging. The protection is released when it recovers to rated return
range.
Less/Over temperature protection in discharging
：
When battery’s temperature is beyond range of -20
o
C ~+55
o
C during discharging, temperature
protection starts, device stops supplying power to the outside. The protection is released when it
recovers to rated return range.
2.4.4 Other Protection
Short Circuit Protection
：
