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?
Hello Vivi
I have the same configuration but my cerbo gx does not recognize my Tewaycell 15kwh batteries despite my can bus câble type B
So I have an overview of my batterie ( voltage current and %)
So base on my parameters ( which I certainly enter wrongly) I have a capacity battery of 3kwh
Any tips to have the battery viewed by the cerbo ( I just put victron in the menu of the Tewaycell)
Thanks for your response
Hi,
Connection with the canbus (canbus bms cable B) and you have to put the first dipswitch to on. In the VRM you can display the data of the Tewaycell BMS (not all) like cell voltage (high/low) temperatures and warnings.
Hello Viwi,
first of all many thanks for your quick reply.
Based on your input, I did change the first switch to ON…no changes … my can cable was connected to ve can bus 2 so I changed to ve.can.bus 1
Then my battery is recognized ( not fully) see printscreens
I thought I should use ve can 2!
The name Thewaycel is not comming automatically
but then what is surprising is that the battery is considered 79% loaded with 48.89V !!!
I have certainly done something wrong …but I had so many trials and errors … that I am not sure where to search!
Again milles mercis ( I supposed you are French based on your printscreens)
Hi, You can customize the Tewaycell name in the blue box. Then the CX shows Tewaycell. Do you have the 15 or 16S ? and do you have the 100 or 200Amps BMS. Further you have to choose in the CX Tewaycell for measuring. The printscreen shows 290 Ah so that’s good. You have activated the active balance on the back of the Tewaycell? In the CX you look for the Tewaycell battery (after you changed Victron for Tewaycell) Now you can look into the specifications of the battery. Look for the higest and lowest voltage and compare these measurements in the BMS of the Tewaycell (with the MK2 usb connection or the little blue screen on te battery. Further I presume you have put the good values and the good battery BMS in the MultiplusII. (in the ESS).
In the VRM avance section you can see the exact measurements of the Tewaycell (see my screenshots)
Are there warnings on the screen of the console? No I’am not French, I’am Dutch living in France ;))
Hello Viwi
Once again, I appreciate your help as I was lost with all those details
I have Tewaycell 48V 300Ah 15KWh LiFePO4 Mobile ESS avec équilibreur actif
I have switched on the active balancing
I had an alarm at noon saying that my voltage batterie was too high so reduced value in the ve configure
And since then , it’s ok
I am now looking at more automation, as I am selling my extra energy on the market…….and some time at negative price ….so no injection
I believe ESS is not flexible enough, so I am looking at home assistant ….another monster
Best regards from a Swiss leaving in France