BMS not working between Sunsynk inverter and battery

[sol4096]

Hi,

I have a 5kWh Sunsynk inverter with a Sunsynk SSLB1 5.1 kWh battery, and the BMS doesn't seem to work: if I go to the LI BMS menu, , it shows everything at zero. The inverter doesn't seem to know the actual SoC of the battery either (I have 2 LEDs on the battery, so it is between 25% and 50%, but the inverter thought it was only 4%...)

The RJ45 cable is plugged to the left CAN/RS485 port on the battery, and to the CAN port on the inverter.
The battery setup is set to Lithium, CAN, Protocol 0.
I also tested the RJ45 cable and it seems fine, although:

• the wire 1 on one side goes to the wire 3 on the other side
• 2 goes to 1
• and 3 goes to 2
• the rest is straight (4 to 4, 5 to 5, etc).

Is that expected?

Any idea how I can fix this BMS connection?

Thanks!

 

[houseofancients]

Hi,

I have a 5kWh Sunsynk inverter with a Sunsynk SSLB1 5.1 kWh battery, and the BMS doesn't seem to work: if I go to the LI BMS menu, , it shows everything at zero. The inverter doesn't seem to know the actual SoC of the battery either (I have 2 LEDs on the battery, so it is between 25% and 50%, but the inverter thought it was only 4%...)

The RJ45 cable is plugged to the left CAN/RS485 port on the battery, and to the CAN port on the inverter.
The battery setup is set to Lithium, CAN, Protocol 0.
I also tested the RJ45 cable and it seems fine, although:

• the wire 1 on one side goes to the wire 3 on the other side
• 2 goes to 1
• and 3 goes to 2
• the rest is straight (4 to 4, 5 to 5, etc).

Is that expected?

Any idea how I can fix this BMS connection?

Thanks!

did you check you used the correct ends of the cable in the correct ports ?
they should have labelled which rj45 goes in the inverter and which one goes in the bms port

 

[LydMekk]

And do make sure you are using the correct cable that came with the battery and NOT the yellow one coming with the inverter...

 

[sol4096]

Yes the cable does seem plugged with the right ends on the right sides, and it isn't yellow.

I'm attaching a few pictures which should help understand the current (broken) state.