I did pre-balance the cells before putting them in service, but they are the usual low-quality Chinese parts, so who knows. The warning is recent, while the system has been in service for six months. However, the ambient temperatures have recently increased substantially. Impedances and voltages from the BMS: Do those numbers indicate a problem? Thanks for your input, I really appreciate it. A.Quote from Tine Andrejasic on June 1, 2022, 5:52 amIf the BMS has to work hard to balance the cells (new not pre-balanced cells or old cells ) it heats a bit over the set threshold. BMS only signals ERROR 5 by red LED, not sound alarm and sends internal alarm to Victron.
How do we define \"excessive balancing\"? I\'m concerned that ignoring this warning could cause me to miss a real problem down the road. But I will check my connections on cell 4. A.Quote from Trond Arvid Røsvik on June 2, 2022, 3:31 amInternal failure is due to excessive balancing and overheating of the BMS. Nothing to worry about really.
I have the corrugated case. Is there a way to have the BMS control an external fan?Quote from Trond Arvid Røsvik on June 3, 2022, 9:10 amDo you have the older version of the 16S BMS with flat top? The newer models have (small) cooling fins. Anyhow this could still happen. Putting an small fan close to the BMS will make the alarms stop. It just means the BMS has stopped balancing due to overheating. But it will resume balancing again.. it just makes balancing take more time.
Can you please elaborate on that? I have a MultiPlus 24/3000/70-50 120V and a SmartSolar MPPT VE.Can 150/70 rev2, both controlled by a Cerbo GX. Yes, I will investigate cell 4 this weekend. Thanks, A.Quote from Trond Arvid Røsvik on June 6, 2022, 3:10 amAlso, if you setup your system using Victron chargers and CAN bus regulated charging this should also not be an problem.
Yes and yes. Everything is working well under daily use.Quote from Trond Arvid Røsvik on June 7, 2022, 2:17 amYes, but did you activate DVCC like its described in the REC Manual? Does your victron units indicate \"External Control\"?
Did you figure this out? I had this problem as well and i needed to lower the balancing voltages.Quote from Adam Sherman on June 7, 2022, 6:23 amYes and yes. Everything is working well under daily use.Quote from Trond Arvid Røsvik on June 7, 2022, 2:17 amYes, but did you activate DVCC like its described in the REC Manual? Does your victron units indicate \"External Control\"?
I did not, what did you lower the balancing voltage to? This means it will reduce current earlier, I guess?Quote from Derek Dickson on September 23, 2022, 7:02 pmDid you figure this out? I had this problem as well and i needed to lower the balancing voltages.
@Adam hi what did you do so far?
@panagiotis So far: nothing. The issue stopped happening. I suspect the cells must be more closely balanced, now.
@Adam can u share your bms settings pls?
There is not an easy way of coping them, so here are some screenshots:
@Adam thanks!
The old CAN protocol for Victron had this eatures for Warrnings. I have mooved this from the code if a lot of ballancing is required the unit heas up. The balancing is reduced near the top end but it may happen anyway. What is the BMS serial that you have?
Send it tom me directly : tine@rec-bms.com so I can prepare the update for you.
@tine That is interesting, thank you for posting.
With the current code, when will the warning be triggered?
If I understand you correctly, you are saying that the new code will allow the balancing to take longer at a lower rate, to prevent exessive heating of the BMS?
I have purchased my second BMS, the 2Q, for my van. Is anything relevant to this new unit?
Also with the 2Q, the alarm for the LOW temp for charging and high BMS temp is silent. 2Q has an aditional algorithm to lower the amount of cells to the most critical, not to step over the BMS max temperature, but it may still happen. If the BMS is not able to balance the cells down due to high BMS temperature the charge current limit will decrease or reset to 0 untill the BMS cools down.
The alarm is trigered the same way but only the ERROR LED bliks, error/warrning 7 or error/warrning 5.
No sound alarm, no alarm sent over the CAN. I tried to send everything over the CAN bus to Victron/SMA, but users do not want to see or hear any GX sound warrnings and think right away something is wrong with the battery/BMS. Me and Rick will try to integrate REC more into the Victron GX and make a custom protocol so the user will see the actual battery/BMS status not just a default errors/warrnings that were predicted by the engineers @ Victron. Also all the cells' voltages and all temperatures.
Rick and other users gave me thinking about how to change this sound buzzer alarm not to drive the users nuts. Let me describe you the solutions from my side and please send me some comments or suggestions. I would like to implement the same solution to all BMS products - some sort of input acknowledge would not work (new Master BMS 10M). From the error/warrning perspective we can distinguish 3 levels or alarms:
Notifications: Error 3, 5, (7)
Warnings: Erors (7), 13, 14, 15, 17,19
Failure: Error 1, 2, 4, 6, 8, 10, 11, 12, 16
Usually we have silenced Notifications and only used buzzer sound alarms for Warnings and Failures.
I am thinking to use the buzzer resonant frequency to control the sound loudness. Notifications - error 5 would be silenced (if the BMS is overheating ), Error 3 (cells difference) and error 7 (under temperature for charging) could be signaled once and then silenced completely.
Warnings would be signaled 3 times and then silenced completely.
Failors would be signaled 3 times and then silenced slightly so the user would still hear them. So if there is something wrong and the battery is disconnected the user will still hear the error if no WiFi or LCD is connected to the system.