I have the following problem: when the storage is nearly full, a critical event is triggered at irregular intervals due to a temperature reading of -40 degrees from an unknown source. I cannot tell whether it comes from the BMS or the Cellmate-K9. As a result, the storage system shuts down, and I have to restart it manually every time. I have been experiencing this issue for about four months.
Hi thedoctor9,
-40 indicates a disconnected or poor connection to the temperature sensor. Have you tried re-plugging or swapping around the temperature sensors to try and isolate the fault:?
Could you please make sure your system is provisioned and PM me your serial number so we can start logging it and give you more targeted advice?
Cheers,
James
Hi thedoctor9.
Now that you have sent me your serial number, I took a look at your system in bmi.batrium.com in a read-only manner.
I can see a few critical events recently, in the most recent event, you can see the real issue: briefly, cell 32 went to 0V, and cell 33 to 6V. In reality, both cells are both likely at around 3V, but a loose link between cells makes it look to our BMS that this huge swing is happening
Could you please try:
- Disconnect the connectors on the K9(s) that manages cells 32 and 33
- Tighten and check the links around that area (being sure to respect the torque specs in your cell manual using a torque wrench)
- Reconnect the K9(s)
P.S. could you send some photos of your physical battery wiring? We may spot something
Hello James.
I have a Watchmon4 for Longmon and Expansion
And suddenly a few days ago, all the cells changed to -40oC.
At first it was one or two of them, for a few minutes, then all of them switched to -40. They came back as normal for a few minutes, then went -40 and have been that way for a couple of days now.
Anything I should try?
I rebooted the system and no change. Also, cannot sync system with this happening.
Thanks
Okay I fixed it.
I finally found the -40 in the troubleshooting guide (yeah, should have found it earlier).
Checked all connections, everythihg fine. I wiggled the wires going into Longmon 14 (last in my battery) and for a second it started woking, but just for a second. Recheck all longmon connections, no problem. I couldn’t reproduce it.
Finally I re-recheck connections to the cmu. Bam it worked, Even though I had retightened the connection, I notice that the red connection was leaning a bit to the left. I straightened it out and it started working.
NOW I know.
thanks
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Nope didn’t fix it. I am going to start another thread for what I have going on.
Thanks