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WeCo Srl Italy www.wecobatteries.com 4K4LT V1.00 24/01/2023
6.3 Starting a parallel system consisting of multiple batteries (Cluster LV).
1. The voltage difference between any of the batteries in the stack should not be more than 2V. Otherwise, the BMS will not allow the
batteries to be activated in a parallel connection.
2. The power wiring between the batteries must comply with manual. Reversing polarity will cause irreparable damage to the battery.
3. Battery DIP switches must be configured with the batteries turned off and must follow the instructions in the manual. The last
module must have the DIP 6 ON (00000100).
4. RS 485 data connections by means of RJ45 cables between batteries must be made correctly as indicated in this manual. The
cascaded RS485 data connection must start from port B of the master battery and continue in RS485-A RS485-B sequence to the last
battery.
5. 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 controlling the inverter display or APP.
6. Before activating the system, the operator must carefully check the power connection and ensure that all safety procedures are
adhered to.
7. Activate all rocker switches (BMS switch) by setting them to I (ON).
8. Press the RUN button of the Master battery only 2-5 seconds.
9. Wait for all SLAVES to turn on automatically. In case of error the LED bar of the specific battery will indicate an anomaly (see
indications LED bar in this Manual)
Turning off parallel batteries
Press the power button of the master battery for five seconds. The green light of the power button turns off immediately.
The green lights of the power buttons of the slave batteries will not turn off immediately but will flash for an additional 30-120 seconds in case
of connection to WiFi module being updated.
In any case, wait for the slave batteries to be completely switched off.
The RED LED lights of the LED bar on the slave batteries will start flashing to confirm that the shutdown has been turned off.
The battery shutdown takes place immediately when the Master battery is turned off, as the MOSFET (Solid State Relay) open within 3
seconds, while the BAR LEDs remain active for a further 10 seconds, and then turn off at the same time as the RUN/STOP button.
The parallel battery system will only have turned off properly when the power button light has gone out.
To turn off the batteries completely and switch off the BMS, you must also turn off the rocker switch of the BMS setting it to 0 (OFF)
Check with a multimeter whether there is voltage at the battery poles. In case of voltage, it will be necessary to check the entire system, as
one or more batteries may have been damaged.
In a parallel battery system, it is not allowed to switch off individual slave batteries.
If there is a reason to turn off a slave battery, it is still recommended to turn off the master and the inverter anyway.
In case of voluntary shutdown of a slave battery, in order to restart the cluster, it will FIRST be necessary to turn off all the batteries and
proceed to a new automatic start, as described in the procedure in point 6.3 of this manual.
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