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1. PRODUCT INDEX:
1.3 Battery Management System
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.
Short circuit protection – If the battery suers 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 cuto (HBCO) and low battery cuto (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).
