Lithium Charging Instructions
Charging Instructions 09.02.20
CHARGING INSTRUCTIONS
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Charging Series Systems
When connecting batteries in series, please make sure each battery is within 50mV (0.05V) of each other before putting them
in service. This will minimize the chance of imbalance between batteries. If your batteries get out of balance, the voltage of any
battery is >50mV (0.05V) from another battery in the set, you should charge each battery individually to rebalance. You can
charge each battery individually periodically to avoid imbalance. When charging LiFePO batteries in series, it is best to use
a multi-bank charger that charges each battery individually to ensure the cells remain balanced. Refer to tables on page 2 for
charging parameters for series systems.
Charging Source: Inverter/Charger and/or Charge Controller
Below are the key, typical charger inputs when using an inverter/charger or charge controller with LiFePO batteries. Many inverter/
chargers require additional parameters, please contact RELiON technical support for assistance. LiFePO batteries do not require
equalizing. LiFePO batteries do not require temperature compensation for voltage when charging at hot or cold temperatures.
Operational Parameters
PARAMETER 12V SYSTEM 24V SYSTEM 48V SYSTEM
Bulk Voltage 14V – 14.6V 28V - 29.2V 56V - 58.4V
Absorption Voltage 14V – 14.6V 28V - 29.2V 56V - 58.4V
Absorption Time 0- 6 min 0- 6 min 0- 6 min
Float Voltage 13.3V - 13.8V 26.6V - 27.6V 53.2V - 55.2V
Low Voltage Cuto 11V - 12V 22V - 24V 44V - 48V
High Voltage Cuto 14.6V 29.2V 58.4V
Note: Charge current must be reduced at temperatures below 0°C (32*F). See details in Charge Temperature section.
Charging Source: Alternator and DC to DC Chargers
Depending on the quality of the alternator it may work fine with LiFePO batteries. However, low quality alternators with poor
voltage regulation can cause the BMS to disconnect LiFePO batteries. If the BMS disconnects the batteries the alternator may
be damaged. To protect your LiFePO battery and alternator please be sure to use a compatible high-quality alternator or install a
voltage regulator. You can also use a DC to DC charger to safely and eectively charge your batteries including house banks.
Fuel Gauges
If you are using a voltage-based fuel gauge that is designed for lead-acid batteries it will not accurately provide state of charge
(SOC). Please replace your fuel gauge with one that measures current rather than voltage.
If you have any technical questions, please contact RELiON Technical Support at 803-547-7288 or our toll-free number 855-931-2466.