Hi

Randomly out of the Blue my 4 x Dyness BX51100 batteries stopped communicating with my 8kw Inverter. The system has been running flawlessly for 2 years with no issues at all.

Last night I noticed my batteries displaying green lights on 1 & 4 of the soc percentage bar. All of my batteries displaying the same and the inverter is not reading the batteries in the LI-BMS menu.

I have battery one set as master (dip switch correct) and 3 other batteries as slaves(dip switch correct)

I have tried the following :

Restarted the whole system,

Replaced all the cables

Tested each battery individually to see if the inverter starts reading.

Performed a factory reset on the inverter.

Done multiple start up procedures.

at this point I have no idea what else to do, I can’t get hold of anyone at Dyness. I also can’t remember how to request a firmware upgrade from sunsynk.

Any help would be greatly appreciated.

Edited January 12Jan 12 by Derek Ramos
wording

@Derek Ramos ,

Until you can resolve, just run voltage mode for the time being, so the system can run by itself, so you can focus on getting a solution.

A Sunsynk upgrade may help, let us know how it goes.

21 hours ago, Sidewinder said:

@Derek Ramos ,

Until you can resolve, just run voltage mode for the time being, so the system can run by itself, so you can focus on getting a solution.

A Sunsynk upgrade may help, let us know how it goes.

Thanks @Sidewinder

I requested and upgrade of firmware from Sunsynk, they pushed through the update pretty quick although nothing has changed with the system.. I'm still unsure if I have an inverter issue or battery issue. What I am going to do is bring one of my brothers BX51100 batteries and connect it up to see if I can find the source of the problem.

do you perhaps know the exact settings required to run the batteries in voltage mode?

Thank you for your help.

@Sidewinder

So I managed to use my brothers battery to test communication..

communication to the inverter with my brothers battery was 100% (BX51100) so now I have narrowed it down to all 4 batteries have a problem with the BMS communication and the inverter is not the problem.

I'm going to have to try contact Dyness to see if a technician can come out and test the batteries or if I can take the batteries to Dyness for testing.

does anyone maybe know someone or have contact details for Dyness?

@Dyness @Dyness Engineer Weizhong

Edited January 13Jan 13 by Derek Ramos

@Derek Ramos ,

If your the tinkering type, try and get a RS232 to USB cable with the spec as per picture.

Then install the appropriate monitoring software on PC to get some info out of all the batteries.

Start with your current master and then each slave. See if you can get the battery firmware version of each.

If the master isn't the latest one, then you can try and make the battery with the latest firmware your master.

Sometimes even just swopping out your master with one of the slaves (NB.. change the dip settings on each!) may even solve this.

Normally, inverters communicate to batteries via CAN, but RS485 is also possible.