My installation:
Multiplus II 48/10000/140.
Battery Tewaycell Lifepo4 16S (Pace BMS) 15kwh, 308 Ah (in Cerbo displayed as 290 Ah), Cerbo GX and system runs with ESS.
For a few days the system continuously gives alarm Low Battery by Victron and the BMS gives error message “Total Voltage Fault” and switches off the battery (all 16 cells have 3.35V). The battery is connected via the Cerbo Canbus and Cerbo communicates with the battery. In the Cerbo the battery is displayed as a Victron battery with a charge of 99%, 53.9v the highest/lowest cell voltage is displayed. If the battery is not connected to the MP then there are no error messages from BMS. Battery connected to Cerbo and MP then error messages “low battery” and “total voltage fault”.
Distance MP/Battery 1 meter, diameter battery cable 70 mm².
Reinstalled the ESS via MK2 and setting voltage for Bulk is 56.4V and Absorption 54V. Maximum voltage for alarm set to 58.7V and minimum voltage 44.8V. With this setting the system has functioned flawlessly for several months.
Help with this problem is very much appreciated.
Sounds like the BMS is shutting down for some reason, when that happens the low battery alarm is normal.
As an unsupported battery, you will need to contact their support for help in diagnosing the error, and checking your configuration is right for that battery.
Pace BMS’s have a console port and use PBMS tools to query it directly.
Thanks for your reply. After some investigations I think it’s a malfunction of the BMS. In the BMS I could’t find any abnormal things, so I did send a file with the battery/bms history to the manufacturer and hope they see wat’s wrong. I keep informed here (unfortunately it’s now Spring Holliday in China).
Not yet an answer from my Chinese friend.
The battery was 2 days completely disconnected from the system (Canbus- and battery connection).
Yesterday I reconnected the battery and to my surprise, so far, the system runs without error messages. I am curious if the Chinese engineer can find any fault or clue in the history file of the battery. I hope so, because I do not believe in miracles.
Finally got an answer from China!!
In the history of the BMS the engineer couldn’t find abnormal data.
Solution from the Chinese engineer:
Set the max. SOC to 95%.
Now my new questions are:
Can I set the max. SOC 95% in the “enable battery monitor” section in the Victron configure 3?
Is this a reliable solution?
Can somebody help me with this, thanks in advance
If the battery has system Comms the ve bus synchronises its soc to the bms soc
Otherwise a shunt will do the same thing.
If not you have to wait for a full charge and a resynchronization.
Thanks for your reply.
The problem isn’t the synchronising. The problem is the “Total Voltage Fault” shutdown. It happened in the night while the battery was discharging!! Also it happens not all the time. It happened a few times.
The solution from the manufacturer is to limit the SOC to 95%. So my question is: can I activate the box Enable battery monitor with this data and what’s eventual influence on the ESS settings.
The data on the other pictures seems good to me, the absorption starts on 99% for 1 hour.
@Viwi
Yes but you did ask a second question. So i edited my previous answer to clarify what i was referring to.
Is this sent to the system?
Can you post a screenshot of it.
How is the rest of the system programmed? Particularly the low dc and the ess dynamic cut off and the sustain voltage in ess?
Where is that programmed?
Merci for your replay.
The “total voltage fault” was first given from the BMS (first alarm then shutdown). Of corse followed up by an “low battery” alarm of the Cerbo.
I can’t find these messages in the BMS history, only on the realtime screen of the BMS (screenshot).
In the following screencaptures the alarm of the VRM given at 13.11 h
and a screenshot of the VRM at 13.08 witch seems OK.
The charger is programmed
I made a screenshot of the settings in the (Pace 200A) BMS for the max voltage and minimum voltage.
The ESS is apparently not programmed for low dc and the ess dynamic cut off and the sustain voltage. I wonder if the assistant asked for it??
The C ratings in the ESS assistant are the low cut offs. It contains a sustain voltage in the wizard.
Edit these to reduce your low battery warnings.
The low voltage alarm can be triggered by the ESS dynamic cut off. They are different to these settings and can over ride them.
The error from the battery is obviously a battery related problem i hope your supplier can provide support sort it out.
Thank you for your quick response which I really appreciate.
My supplier did give me the solution: Set the SOC on 95%, thats all!!
I will edit dynamic cut off in the the ESS and hope with the 95% SOC setting that this will prevent the “total voltage fault”.
Have one more question, everyday the Cerbo gives a warning of Cell
imbalance .
The VRM doesn’t mention this Imbalance. The BMS of the battery has a continue balance and in the absorption/float condition the cells are all in balance, no difference in voltage. During discharge the cells rest in balance
For the moment I ignore this warning, but I think it’s strange. Is there a reason or explanation for this daily warning?