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4.1.2 Multi-strings System Power On
Warning: Double check all the power cables and communication cables. Make sure the
voltage of the inverter/PCS matches the voltage of the battery system. Check to make sure
all the power switches are OFF.
System Power on Procedure:
1. Check grounding is connected.
2. Check all cables are connected correctly, especially the Link 1 / Link 0 between master and
slave strings.
3. If necessary, turn on the switch for battery on the inverter or the switch between inverter
and battery system. If possible, turn on AC or PV power source to wake up the inverter.
4. Open protect cover of Power switch. And turn on power switch on the control module
(BMS)of all the strings.
5. From the last string, press start button for at least 5 seconds or until buzzer rings for start-
up. Then further turn on each string one by one follow below table, the start-up interval
between each strings shall less than 30secs:
Master string Last Start-up
Slave string 1 5th Start-up
Slave string 2 4th Start-up (if has)
Slave string 3 3rd Start-up (if has)
Slave string 4 2nd Start-up (if has)
Slave string 5 1st Start-up (if has)
6. After all strings start-up, the battery system takes 30sec for self-checking.
If the inverter is powered by AC or PV source, most types inverters can set up communication
with BMS automatically. In this case, the BMS will close relay and system is ready for work.
If after 30sec self-checking the LED becomes as follows, this means the inverter needs to be
powered on by the battery energy:
In this case, press and hold the Start button for at least 10s, till the Status LED lighting Blue
and fast flashing. Then battery will perform black start to support inverter. After the inverter is
started and communication is established, the BMS is ready for work.
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