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Warning: Internal Failure

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The voltage graph during balancing a couple days ago:

If I look at other balancing sessions, it appears it is always cell 4 that lags:

Internal failure is due to excessive balancing and overheating of the BMS.

Nothing to worry about really.

But if Cell 4 always needs balancing then that's not an good sign for the health of that cell.

 

Quote from Trond Arvid Røsvik on June 2, 2022, 3:31 am

Internal failure is due to excessive balancing and overheating of the BMS.

Nothing to worry about really.

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.

Do 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.

 

Quote from Trond Arvid Røsvik on June 3, 2022, 9:10 am

Do 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.

I have the corrugated case.

Is there a way to have the BMS control an external fan?

Adding a fan interlock should be fairly easy.  You can use the opto output with a N/C relay.  This output is used to disable older chargers that are not on the CANBus, so by adding a N/C relay you will invert the output to turn on a small computer type fan.  You will want to wire the fan power to the system+ side, so it doesnt keep running with the system is shut off.  This would start the fan whenever one of the cells exceeded CHAR as I recall.  The other option would be a small electronic computer temp controlled fan, something like one of these.

Standard Temperature Controlled Cooling Fan Kit

I have not tested the opto output suggestion, so if it works for you please let us know.

I would rather put more effort in finding out why Cell 4 needs so much balancing, does not seem normal to me.

Also, if you setup your system using Victron chargers and CAN bus regulated charging this should also not be an problem.

 

Quote from Trond Arvid Røsvik on June 6, 2022, 3:10 am

Also, if you setup your system using Victron chargers and CAN bus regulated charging this should also not be an problem.

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.

Yes, but did you activate DVCC like its described in the REC Manual?

Does your victron units indicate "External Control"?

 

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  • DVCC.png
Quote from Trond Arvid Røsvik on June 7, 2022, 2:17 am

Yes, but did you activate DVCC like its described in the REC Manual?

Does your victron units indicate "External Control"?

Yes and yes.

Everything is working well under daily use.

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