100Ah und 120Ah Batterie

[dominik]

62V könnten aber noch oberhalb der BMS Abschaltschwelle liegen und ist wirklich nicht tiefentladen, dann könnte es andere Gründe geben.

Wichtig wäre die Einzelzellen zu messen, denn nur damit lässt sich feststellen ob eine Zellbank nach unten in die Tiefentladung abgedriftet ist, was tatsächlich gefährlich werden könnte.

[Nurmaguck]

Dann werd ich mich mal ran machen müssen-mir grauts schon vom Silikon rauspobeln…
Nächste Woche bin ich erstmal im Allgäu-mal sehn ob ich dannach mal Muse hab!
Ich hatte das Glück dass ich meine Ersatzteil-Odin zum Tüv schieben konnte-der ist gleich neben meiner Halle!
Danke erstmal für die Antworten! Ich werde mich melden wenn es was neues gibt!

[bob2.0]

I twice now, in my battery's life with me, have triggered the BMS to shut down the battery twice in a row.

If the voltage drops so low it shuts off, you can wait a few moments and you can start it back up after recharging it gradually.

This has what has happened to me (first time was about 3 miles into 'bar 4') and I re-triggered the battery and got another mile or so. At that 2nd trigger I felt I might make the BMS angry at me and it'd never start again. So I pushed it home from there.

Same second time, it shut down, waited a bit and again got a mile or so before it did it again. Pushed from there. But in this case I think it had dropped a bit further and it was 'sluggish' to recharge. It seems fine now.

I have a variable charger and found setting it to 3A was better to wake it back up again. Was it as low as 62V when it shut off second time? I think, possibly, might have been. I suspect that this is OK but the problem is the BMS is hesitant.

But the low pack voltage might not be why the BMS is preventing you to use the pack, it might have detected one cell (level) has collapsed and is wrecked. At 62V, I think an imbalance and an 'unsafe' cell discharge might have happened.

My summary; I would simply try charging the pack by simply putting the charger on it and leaving it to sort itself out. The charger 'might' turn itself off because it is not seeing a battery and the BMS is only prepared to trickle a charge in. So, if the first thing doesn't work (charger, and leave it) then I would find a way to apply a steady DC power source that can trickle a charge in, and just leave it for a while.

So, it might actually be your charger refusing to charge, than your battery refusing to take the charge.

I'd like to see how the BMS actually isolates the cells, in a circuit diagram with parts references. But, I think, if you can actually see 62V at the terminals then it should take a charge, it has not been fully isolated. Just, find a way to charge it at a limited current (which might not be your regular charger).

Maybe having invested in a variable current charger solved this slow battery charge-up I experienced last time, and I was fortunate with that.

I would happily buy from someone a 130Ah 62V pack with my faith that this is all it is, so long as it was cheap enough to take the risk.