3.7.2.6. Description of the parallel connection of battery control modules
The first installation should do full charging progress.
After the Master controller has communicated with each slave BMS, it will run parallel opera-
tion. It will begin from lowest voltage battery string to do the parallel operation during the
charging.
If the status LED of BMS turns to green, it means this battery string is in parallel operation.
When the voltage difference between strings is lower than the default parameter, the battery
string will do the parallel operation. Then the power relays in BMS will switch ON after 30
seconds. The “STATUS” lamp of the BMS will light green;
When the voltage difference between strings is higher than the default parameter, the battery
string will NOT do the parallel operation, the “STATUS” lamp of the BMS will light red, but it is
normal; Such battery string will be paralleled in during charging or discharging stage
automatically.
3.7.2.5. Pre-charge function (Soft start)
The BMS has Pre-charge function. In each parallel operation, Pre-charge function will work.
If the pre-charge failure, it will retry the function after 30 seconds. Pre-charge failed for 3
consecutive times, the battery system will be Pre-charge error.
3.7.2.4. Black Start
If long press the start button 30 seconds AFTER power on. The “STATUS” lamp will become
green.
When the black start function is enabled, “STATUS” lamp remains red, it means the black start
function is failed to active, it needs long press start button again. System will close relay and
output for 10mins.
Warning: DONOT operate the system restart repeatedly when the Pre-charge error exists.
The power connection（D+,D-） may be short circuit.
Warning: if the black-start function is enabled, the terminal of D+ and D- will be electricity
dangerous with high DC voltage output.
Note: If there is no communication between master controller and upper controller, the
battery system can’t work normally. External device should communicate with battery system
through LAN, CAN or RS485. Otherwise maybe cause battery system work abnormally.
Caution: During first time power on, the system will require to do fully charge progress for SOC
calibration purpose.
Caution: The whole Battery Energy Storage System (BESS) after installation or reuse the BESS
when it is not used for a long time , user should charge it to full at first.
There will be a regularly (3 month) fully charge requesting during continuous operation as well, it will be
handled automatically by the communication between BESS and external device.
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