LITHIONICS BATTERY, CLEARWATER, FL 33765 USA
PH: 727.726.4204 | FAX: 727.797.8046 | WEB: LITHIONICSBATTERY.COM
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BMS Functions
Below is a detailed description of advanced BMS features and how they affect the state of the battery. Some features depend on setup
parameters which are described in detail in the Configuration section of this user guide.
▪Power On/Off –In addition to the automatic disconnect protections, the battery can be manually turned off to disconnect
power at the terminals during installation, service, or storage.
▪Reserve Voltage Cutoff (RVC) –During discharge, the BMS will disable discharge current at approximately 10% state-
of-charge, or when any cell reaches 3.0V (approximately 12.0V total voltage). This allows the battery to store a small energy
reserve. Once the battery is in the RVC state you can use the reserve energy by a short-press of the power button.
oIt is recommended to charge the battery soon once it reaches RVC.
oThe battery will fully power off if it is not charged after sitting for 72 hours to further conserve its energy.
▪Low Voltage Cutoff (LVC) –During discharge, the BMS will disable discharge current when any cell reaches the 2.6V
(approximately 10.4V total voltage). Charging current is allowed, so that the battery can still be charged by a charging source.
Some charging sources require to “see” the battery voltage before allowing charging, in which case LVC lockout can be
temporarily overridden by short-pressing the Power button. This will allow the charger to sense the battery voltage, so
charging can begin.
oIt is recommended to charge the battery immediately once it reaches LVC.
oThe battery will fully power off if it is not charged after sitting 12 hours to further conserve its energy.
▪High Voltage Cutoff (HVC) –During charging, the BMS will disable charge current if any cell reaches 3.75V or higher
(approximately 14.8V total voltage). This should not happen during normal operation if the charging sources are setup with
correct charge settings. Once the charge current is removed the battery voltage will slowly lower and the BMS will
automatically disengage HVC.
▪Cell Temperature Based Cutoff –When the internal battery temperature goes below or above the temperature limits
the BMS will disable charge or discharge current to prevent further use of the battery until the temperature returns to safe
operating limits. Different temperature limits are enforced for charging and discharging due to the nature of LiFePO4
chemistry. Please see the specifications table below for temperature limits.
▪BMS Temperature Based Cutoff –When the BMS temperature goes above 180F the BMS will disable charge and
discharge current to prevent further use of the battery until the temperature lowers to below 160F.
▪Over Current Protection –The BMS will disable discharge or charge current if the amperage exceeds 125A for 2 minutes
continuously. To restore normal operation, remove/address the source of the overload, then short-press the Power Button.
▪Short Circuit Protection –The BMS will immediately disable discharge current if the current value exceeds 1200A. To
restore normal operation, remove/address the source of the short circuit, then short-press the Power Button.
NOTE - The lithium battery is capable of significant power output and may maintain the voltage level during a short circuit
event, producing a very large current capable of melting or welding connection points and damaging cables and connectors.
Even when the BMS detects the short circuit and tries to protect, the BMS may be damaged under such a large current. Make
sure that the battery connection is always properly fused and does not rely on the BMS alone for short circuit protection!
