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6.5 BATTERY CHARGING

6.5.1 CHARGE CYCLE

Ensure the proper settings are set on the charge controller and/or inverter being used to avoid

overcharging or damaging the module. (Refer to the Technical Specifications for a full list of

charging/discharging parameters.)

TROUBLESHOOTING, MAINTENANCE & DISPOSAL

7.1 INTRODUCTION TO THE BMS

The BMS (Battery Management System) is intended to safeguard the battery and battery cells against

a variety of situations that could damage or destroy system components. This protection also aids in

keeping the battery and battery cells operational for a greater number of life cycles. Each EG4-LL

battery is specifically configured to ensure peak performance and operation with any system.

7.1.1 BMS PROTECTION

PCB Temperature Protection

The BMS will ensure that the PCB (Printed Circuit Board) does not overheat. This is the part that

houses most of the “brains” of the battery. This feature will turn off the battery if it begins to overheat.

Cell Balance Protection

Cell balance ensures that each cell is within a specific voltage range of each other. Cell balance is

crucial for ensuring that the battery is operating properly for its lifespan. This is always done

automatically.

Environmental Temperature Protection

It may be dangerous to attempt using the battery in extreme heat or cold. Continued operation in these

conditions may result in permanent damage to the battery module and its components. To prevent this,

the BMS is designed to measure the temperature while charging/discharging and will shut down the

battery to prevent damage.

Voltage Protection

The BMS is designed to continuously monitor the voltage of each individual cell and ensure that they

are not over/undercharged.

IMPORTANT:

It is normal for LFP batteries that have their own internal BMS and that are

wired in parallel to demonstrate a wide variety of SOC readings during any given charge or

discharge cycle. Variations of up to 10% are common. This is not cause for concern or

indication that the module is providing less than the maximum capacity. This is caused by even

slight variations in wiring resistance to each battery, internal resistance, temperature differences,

and even variations in each cell. Even a slight variation causes one battery to take more of the

load or charge for a short time. Over the duration of the discharge or charge cycle, this will

balance out with the lagging battery then taking the load or charge at the other end of the cycle

resulting in recovering the full listed KWH capacity of the pack. The voltage differences created as

batteries diverge in SOC will eventually cause them to converge at some point in the cycle.

EG4 LL User Manual

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