I have a Sunsynk 8kva hybrid inverter with 3 Hubble AM5 batteries connected in parallel with the correct comms cables and dip switch settings. The system worked as expected for a couple of weeks but I am now experiencing the following issue:

The battery which is set as the "master" is not discharging  in sync with the other two batteries as it used to do. During a single bout of loadshedding it will discharge completely even though the other two batteries are almost full charged. The Sunsynk software shows that the batteries are discharging slowly down to say, 75% but in fact only the two slave batteries are at 75% and the master battery is discharging completely within a two hour load shedding period at a low load. It discharges so much that the alarm sounds and at times it discharges to the point when it has zero charge and has to be reset a few times in order to get it started again.

Has anyone experienced a similar issue and are there any suggestions for a solution? Hubble support appears to be offline this week.

I have tried resetting all 3 batteries in sequence but that didn't make any difference.

Thanks.

AJ

 

Think key detail that's missing is your wiring config

The master battery is connected to the inverter with the Comms cable that came with the Hubble battery and the other two are daisy chained in parallel. I have set the dip switches per the AM5 manual. The inverter seems to recognize that 3 batteries are connected but it sometimes gets confused because the master battery is discharging at a very fast rate. 

The comms cable that is shipped is usually a one to one which works with some inverters like the Growatt.
You should make up a cable for your Inverter as per the guide on the Hubble site
https://www.hubblelithium.co.za/sunsynk
 

On 2022/12/30 at 12:41 PM, CapeTownMac said:

I have a Sunsynk 8kva hybrid inverter with 3 Hubble AM5 batteries connected in parallel with the correct comms cables and dip switch settings. The system worked as expected for a couple of weeks but I am now experiencing the following issue:

The battery which is set as the "master" is not discharging  in sync with the other two batteries as it used to do. During a single bout of loadshedding it will discharge completely even though the other two batteries are almost full charged. The Sunsynk software shows that the batteries are discharging slowly down to say, 75% but in fact only the two slave batteries are at 75% and the master battery is discharging completely within a two hour load shedding period at a low load. It discharges so much that the alarm sounds and at times it discharges to the point when it has zero charge and has to be reset a few times in order to get it started again.

Has anyone experienced a similar issue and are there any suggestions for a solution? Hubble support appears to be offline this week.

I have tried resetting all 3 batteries in sequence but that didn't make any difference.

Thanks.

AJ

 

Seems like the CanBus/battery ID/interconnect/BMS may have a problem.
Can you post the LiBMS screen from the SunSynk:

Depending on the SoC you should see 300A for 3 batteries.
 

Thanks for your response, I did indeed see 300A for 3 batteries but the one battery was still discharging at a different rate. I've done some troubleshooting with Hubble support who were very helpful and have finally sent the battery in for assessment. I suspect the battery is faulty. 

How are they wired? Post a picture.