At that time just my 2A active Balancer.
Any BMS wouldn't have stopped the fire.
I have the DIYBMS, and like it a lot.
There is now version 4.40 with a new controller. Most parts are in, PCB's (partly populated) can come in any day now.
Good thing about DIYBMS is that it has a per cell (or parallel cell set) module that have the possibility for external temperature sensor (one)
That way you can monitor almost all busbars for temperature.
Why the busbars? They are close to the cell temperature, and mostly,if there is a failure contact, that's one of the parts that heat up the most.
Diybms can do different things based on different readings, and has 4 contactors who can turn something on or off.
If any cell (connection) would get to hot, it can disconnect all power.
That should have stopped the problem, probably.
If it was the temperature sensor wire that got crushed between stud and sheet, and with it making Falce contact with other terminal (short)...
The fire still would have happened.
Funny thing:
I've cycles the heaviest "damaged" cells several times, discharge with capacity tester, and (top) charge.
Both with 10A.
Surprised to see that they aren't behaving any different from the other cells.
Even have similar capacity left.
What I do notice, capacity testing 48 cells (probably 60 as a few have more cycles) is that the voltage fluctuate!!
Not during the test, but between the different tests.
I have 3 of them, and at the same SOC discharge, and same 10A, cells give different voltages, sometimes surprising much. (Like 3.1 and 3.3v)
At the end they all have the same capacity, give it take a few AH.
The difference is not related to the discharger, I've tested same cells on different testers.
For me once again an indication that voltage is a really bad indicator for SOC.
Only "empty", "not empty", "probably full" and "fully charged" can be measured.
Percentages are impossible as they aren't the same for each cell with that SOC and similar charge or discharge rate.
Funny to see this.
I hope none of you ever needs to do capacity test for so many cells, living off grid.
(Is charging only during sun hours, not with MPPT, buy individual cells or sets of 4)
It's a monster job that takes already +3 weeks.