1.3 Battery
Management
System
Page 4 of 9
Our lithium iron phosphate (LiFePO4) battery pack includes an onboard digital battery
management system(BMS). The BMS monitors voltage, current and temperature on both
an individual cell and battery pack level. If any of these measurements deviate outside
of their safe operating ranges, the BMS will actively work to correct the deviation. If the
deviation cannot be corrected automatically, the BMS will initiate a self-protect shutdown
by opening the internal contactor, disconnecting the battery from the charger and loads.
Overcurrent protection
– If the charge or discharge current of the battery
exceeds maximum permissible levels, the BMS will disconnect itself automatically. To
recover from a high current shutdown, remove the load from the battery, and then rest
the battery by turning the battery OFF and back ON.
Overcharge protection
– If the battery`s voltage exceeds permissible levels the BMS
will disconnect itself automatically. To recover from a high voltage shutdown, remove
the charge source from the battery. The battery will automatically reconnect once
the charge source has been removed and the battery’s voltage drops down to
permissible levels.
Over discharge protection
– If the battery`s voltage drops below permissible levels the
BMS will disconnect itself automatically. To recover from a low voltage shutdown, remove
the load from the battery. At this point the battery should be charged immediately.
If the battery does not start on its' own, you may need to put a charger on the battery. If
the battery is so discharged that the Low Voltage Shutdown cannot be cleared, the battery
must be returned for non-warranty service.
S
hort circuit protection
– If the battery suffers from a short circuit, the BMS will
automatically disconnect. The battery will resume normal operation after the short
circuit is removed.
Temperature protection
– If the battery`s temperature exceeds permissible levels
the BMS will disconnect itself automatically. The battery will automatically
reconnect once the temperature has returned to permissible levels.
Safety shutdown features on your inverter(s) and charger(s) should be
the rst line of protection against overcurrent or over voltage situations. Set your
system’s max current, high battery cutoff (HBCO) and low battery cutoff (LBCO)
according to the Charge / Discharge Parameters section of this manual. The
Battery Management System`s Shutdown is designed as a last resort self-protect
shutdown, and should not be relied upon for managing charge voltage or
currents. Doing so will signicantly shorten the battery’s life expectancy and
could negatively impact your inverter(s) or charger(s).
