Battle Born Batteries 8D Manual
6
How Does the BMS Protect the Batteries?
All Battle Born Batteries come with a built-in battery management system (BMS) that protects the cells from many
strenuous circumstances to protect the life cycles of the cells and your electrical system from potential damage.
The BMS protects against the following conditions:
High Voltage Disconnect (> 14.7V)
If an individual cell voltage exceeds a prescribed threshold during charging, the BMS will prevent a charge current from
continuing. Discharge is always allowed under this condition. If the batteries have not been balanced for a long time,
high voltage disconnect could occur at a lower voltage. The batteries will rebalance after several full charges.
Low Voltage Disconnect (< 10V)
If an individual cell falls below a prescribed threshold during discharge, the BMS will prevent further discharge. Although
the battery is in “low-voltage disconnect” mode, it will still allow a charging current.
NOTE: Many chargers must detect a voltage over 10V to send a charge to the battery. Please be aware that some chargers may not sense a battery in low voltage
disconnect and you may need to jump with a 12V source to “wake up” the battery. You should jump your battery within 24hrs of entering low voltage disconnect
otherwise you risk damaging your battery and voiding the warranty.
High Temperature Charging and Discharging (> 135°F/57.2°C)
The BMS will not allow a charging or discharging current if the internal temperature of the battery has reached 135°F
(57.2°C).
Low Temperature Charging (< 25°F/-3.9°C)
The BMS will not allow a charging current under 25°F (-3.9°C) but will continue to discharge down to -4°F (-20°C).
NOTE: The BB8D has an operating temperature range of 4°F (-20°C) to 135°F (57.2°C).
High Current Discharge Surges
The BMS will not allow a current that exceeds 500 (+/- 5%) Amps for more than 30s, or anything larger for 0.5s. After a
high current disconnection, the battery will automatically reconnect after 5 seconds.
Balancing of Cells
A passive balancing process is activated by the BMS at the top of each charge cycle when the battery voltage exceeds
around 14.2V. This ensures that all the cells remain at the same state of charge, which helps pack longevity and
performance.
How to Properly Size Cables
for a System Install
When considering cable sizing there are a
few factors to consider. First, what is the
size of the load you are powering with the
battery bank? Second, how far away from
the battery is the load? You can do
voltage drop calculations to see if you
need to step up your cable size. Fig. 5 is a
chart to use for reference. Do keep in
mind that cables are only capable of
carrying a certain amperage and you
should verify the specifications of your
cable and the power draws before
implementing them into your system to avoid potential failures and damage
.
Figure 5: As a rule of thumb, you can use these numbers as a guideline.
Cable QR Code