Instruction Manual 24V/200Ah LiFePO4 Trailer Battery Packs
Version: Sept 2020 - 2 -Mainland Energy Conversion Ltd.
Tel: +852 2366 9610
www.mec-powersolutions.com
Preparation –Before Charging or Discharging
General Checking
•Check thoroughly including all the cables for showing no damages
•
Polarity Checking
WARNING: Check the polarity before connecting to the charger or the load
DC Mains Supply Checking
•Make sure the DC cable must not be cut, shortened or extended under any circumstances
•Make sure the mains supply complies with the technical specification requirements of the charger and the battery pack
Charging the Battery Pack
Connecting the Charger to the Battery Pack
•Make sure the mains supply and the charge profiles of the charger comply with the specifications of the battery pack
•Switch off the charger and connect it to the battery pack
•If this is the first charging of the battery pack, please switch the BMS to “ON” mode and wait for 10 seconds. The BMS collects the system
data and makes the battery pack ready for charge. Immediate charging of battery pack after switching on may damage the circuit.
•Connect the charger to mains supply and switch on the charger
Charging the Battery Pack
•Low temperature Charge Method: 0.1C (i.e. 20A) Constant Current Charging @0 oC to 10oC
•Standard Charge Method: 0.2C (i.e. 40A) Constant Current Charging
•Maximum Charge Current: 0.5C (i.e. 100A)
Charging Advice
The working environment of the battery pack may affect the charging performance. The optimum charging condition is from 0°C to 45°C and 60±25%
relative humidity. You are advised to ensure a suitable working environment for the battery pack. Otherwise, the charging efficiency, battery capacity
and battery lifetime may be affected.
Discharging the Battery Pack
Before Discharging
•Make sure that load / device is switched off
•Connect the battery pack to load / device
•If this is the first discharging of the battery pack, please switch the BMS to “ON” mode and wait for 10 seconds. The BMS collects the system
data and makes the battery pack ready for discharge. Immediate discharging of battery pack after switching on may damage the circuit.
•Switch on the load / device
Discharging the Battery Pack
•Standard Discharge Method: 0.5C (i.e. 100A) Constant Current Discharging
•Maximum Discharge Current: 1C (i.e. 200A)
Discharging Advice
The working environment of the battery pack may affect the charging performance. The optimum charging condition is from 0°C to 60°C and 60±25%
relative humidity. You are advised to ensure a suitable working environment for the battery pack. Otherwise, the charging efficiency, battery capacity
and battery lifetime may be affected.
Storage and Caring of the Battery Pack
Battery Storage:
As there are chemical reactions within the cells, the battery performance deteriorates over time and this is absolutely normal. If storage is required,
the battery pack should be charged to 50% state of charge (SOC) for storage. Under different storage conditions, the recommended charging period
is varied:
•The battery pack should be charged and discharged fully once every 3-month for maintenance.
•Under -20°C to 25°C: Charge to 50% SOC and the battery pack can be kept for 3 months
•Under -20°C to 45°C: Charge to 50% SOC and the battery pack can be kept for 1 month
Storing the battery pack under extreme conditions speeds up the degradation of the cells within. In long run, this would greatly reduce the battery
capacity and lifetime.
Battery Care:
•Never expose the battery to high temperatures, as this causes permanent battery capacity loss.
•Never deep-discharge or overcharge the battery, cells can be damaged irreversibly.
•If possible, always disconnect the battery from the load when being stored over long period of time.
•Store battery in a dry and cool place at about 40-60% of its rated capacity.
