B3 ESS Unit User Manual
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the voltage of each cell back to rated return range, the protection is over.
Over Voltage Protection in Charging：
Battery will stops charging when total voltage or any battery cell voltage reaches the
rated protection value during charging stage. When total voltage or all cell back to rated
range, the protection is over.
Current Protection
Over Current Protection in Charging：
When the charge current>45A, current limit protection mode is activated, current will be
limited to≤3A，protection is removed after rated time delaying 10S. Circulate like this
until the current is lower than 45A.
Over Current Protection in Discharging：
When the discharge current is higher than the protection value, the battery buzzer alarms
and the system stops discharging. Protection is released after rated time delaying.
The buzzer sound alarm setting can be manually turned off on the background software,
and the factory default is on.
Temperature Protection
Low/Over temperature protection in charging：
When battery’s temperature is beyond range of 0
o
C ~+55
o
C during charging,
temperature protection is activated, device stops charging.
The protection is over when temperature back to rated working range.
Low/Over temperature protection in discharging：
When battery’s temperature is beyond range of -20
o
C ~+55
o
C during discharging,
temperature protection is activated, device stops supplying power to the outside.
The protection is over when temperature back to rated working range.
Other Protection
Short Circuit Protection：
When the battery is activated from the shutdown state, if a short circuit occurs, the
system starts short-circuit protection for 60 seconds.
Self-Shutdown：
Battery’s maximum discharging current should be more than load’s maximum working
current.
When device connects no external loads and power supply and no external
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