WeCo Srl Italia
www.wecobatteries.com
4K4 PRO V 1.11 28-9-2021
6.3 Parallel Battery Configuration
1.
The voltage difference between any of the batteries in the stack must not be greater than 2V. Otherwise, the BMS will not allow
the batteries to be activated in a parallel connection.
2.
SOC of each battery in the stack must be the same (check SOC as individual battery before parallel connection)
3.
The power cabling between the batteries is in accordance with section 5.6 of this manual.
4.
All DIP switches are configured in accordance with section 5.5 of this manual.
5.
The RS 485 inter battery data connections are properly connected as per section 5.6 of this manual. The data connection “daisy
chain” must start from port-B of the master battery (do no install the RS485 on the port-A of the master battery, it will occur in a
fault)
6.
Connect the CAN port of the master battery with the CAN port of the inverter and make sure that the communication is working
properly by checking the inverter display
7.
Before activating the system, the operator should check the cable connection carefully and make sure that all safety procedures
are respected. Check the inverter settings and connection before turning on. In case of an inverter without communication make
sure to set the voltage and current value as per the charge/discharge parameters provided in this manual.
6.3.1 Activation of Parallel Batteries (From Master to Sub#4)
Short press the Master power button for one second. The GREEN RUN light should come on. The battery has been activated normally.
Short press the Sub#1 power button for one second. The GREEN RUN light should come on. The battery has been activated normally.
Short press the Sub#2 power button for one second. The GREEN RUN light should come on. The battery has been activated normally.
Short press the Sub#3 power button for one second. The GREEN RUN light should come on. The battery has been activated normally.
Proceed with the same procedure up to the last battery of the cluster * max eight modules
Now all parallel batteries are activated normally and the parallel system is properly powered on.
6.3.2 Shutdown of Parallel Batteries
Long press the Master Power button for five seconds. The GREEN RUN light should go off immediately.
The GREEN RUN lights on the slave batteries will not be extinguished immediately.
The RED FAULT lights on the slave batteries will start flashing after ten seconds and the GREEN RUN lights will remain on.
After one minute the RED Fault lights and the GREEN RUN lights on all slave batteries will go off.
The parallel battery system has shutdown properly
In a parallel battery system, we strongly advise not to switch off individual slave batteries. If there is a reason to switch off a slave battery,
we recommend that the procedure described in 6.3.2 of this manual is followed.
Switching off an individual slave battery in a parallel system is possible in an adverse situation, but only as a last resort.
