Hy Guys,

I am trying to set up my BMS but the inverter is not communicating with the batteries. I have a 8kW inverter with 2 US 3000 batteries. I have tried the settings in both manuals. I have switched the batteries on and off and now the SOC is not displaying correctly. It was on 70% but now it is showing 100%

18 hours ago, FrancoisFrundt said:

Hy Guys,

I am trying to set up my BMS but the inverter is not communicating with the batteries. I have a 8kW inverter with 2 US 3000 batteries. I have tried the settings in both manuals. I have switched the batteries on and off and now the SOC is not displaying correctly. It was on 70% but now it is showing 100%

Have you used the correct cable from the batteries to Sunsynk?

Used the right DIP settings on the batteries?

18 hours ago, FrancoisFrundt said:

Hy Guys,

I am trying to set up my BMS but the inverter is not communicating with the batteries. I have a 8kW inverter with 2 US 3000 batteries. I have tried the settings in both manuals. I have switched the batteries on and off and now the SOC is not displaying correctly. It was on 70% but now it is showing 100%

Send some pics of the inverter battery settings and LiBMS screen. See this thread from today , your settings should look the same.

 

Edited May 17, 20224 yr by Nexuss

On 2022/05/17 at 2:10 PM, Scorp007 said:

Have you used the correct cable from the batteries to Sunsynk?

Used the right DIP settings on the batteries?

It is the cable that came with the batteries. I saw that the cable is different for the 3000 and 3000c. How would I know if it is correct? 
 

dip switch settings 0000

 

On 2022/05/17 at 2:21 PM, Nexuss said:

Send some pics of the inverter battery settings and LiBMS screen. See this thread from today , your settings should look the same.

 

Your BMS comms is not working if the LiBMS screen looks like that . I see it looks like you have the US3000B? I am not sure how the settings for those work but it should say in the manual.

Thanks,

It just says US3000 on the battery so I suppose it could be a B. I have tried the settings in the manual but no luck. I suspect it is the cable. I have found this document. Will test the cable and see. 

Sunsynk Hybrid Inverters with lithium-ion batteries v3.pdf

Hi there. Did you manage to fix this? I have the same issue with my 8kw sunsynk inverter and 2x5kw batteries 

Hi! Yes I did. I just changed the cable and then it worked. I switched the batteries off changed the cable to a standard RJ45 ethernet cable and it worked. 
 

Standard RJ45 won't work for @Jameel Fakee.

Jameel you haven't mentioned what battery manufacturer; almost certain though you'll need a certain RJ45 cable (or you could crimp one yourself based in pinout diagrams in inverter and battery)

I can not get the battery communicate saw a instruction pdf online from .. solar supplies, they say connect the yellow cable on the can port on the battery and BMS/CAN on the inverter and only dip switch 1 in on position everything else OFF. I have done that but it does not work, even reset the inverter to factory settings

I tried a different R45 cable same result, even measured RJ45cables with tester, both cables are standard RJ45. Can anyone tell me if the yellow cable suppled does work or where I am going wrong please. Thank You Christoph

SUNSYNK-PYLONTECH-WRITE-UP-12 battery connection setup 16032023.docx

Which battery @Christoph ?

 

Sorry UUUPS Pylontech US3000C, Thanks you Christoph

I suspect thats the issue - the US3000C uses a different cable compared to the older US3000s (different pin-outs). 

You'll need to crimp a new plug on according to correct pin outs (steps have been discussed in other threads) or buy the appropriate cable.