6
Lithium battery connection
If choosing lithium battery for Growatt SPF series products, you are allowed to use the lithium battery only
which we have configured. There‟re two connectors on the lithium battery, RJ45 port of BMS and power cable.
Please follow below steps to implement lithium battery connection:
1.
Assemble battery ring terminal based on recommended battery cable and terminal size (same as Lead acid,
see section 3.4.1 for details) .
2.
Insert the ring terminal of battery cable flatly into battery connector of inverter and make sure the bolts are
tightened with torque of 2-3Nm. Make sure polarity at both the battery and the inverter/charge is correctly
connected and ring terminals are tightly screwed to the battery terminals
3.
Connect the end of RJ45 of battery to BMS communication port of inverter.
4.
The other end of RJ45 insert to battery comm port.
Note:
if choosing lithium battery, make sure to connect the BMS communication cable between the battery and
the inverter. You need to choose battery type as “lithium battery”.
Lithium battery communication and setting
In order to communicate with battery BMS, you should set the battery type to “LI” in Program 5. Then the LCD
will switch to Program 51, which is to set the protocol type. There are four RS485 protocols in the inverter.Basic
Protocol 1 is defined by Growatt. Protocol 2, Protocol 3 and protocol 4 are other customized protocols. Any
questions about the communication with BMS, please consult with the Growatt.
1.
Connect the end of RJ45 of battery to BMS communication port of inverter
Make sure the lithium battery BMS port connects to the inverter is Pin to Pin, the inverter BMS port pin
assignment shown as below:
Pin number
BMS port
1
RS485B
2
RS485A
3
--
4
--
5
--
6
--
7
--
8
--
