I considered the possibility as well as the simple fact was there are no ready made buss bars for the Winston’s cells. I did lengthen all of my BMS sense leads the exact same amount as there is no offset like with the jk/jbd offerings
What question are you responding to here? "What you said" ... I said a lot of things in this thread, no idea what this refers to.
You're the most knowledgeable person in this thread so I'd readily accept what you have to say. But I ain't swapping cells until I try what @rogerheflin proposed.
Sorry bro, I am not following you. You seem to be saying contradictory things but since that's unlikely, I guess I just don't understand. Maybe you're being sarcastic or something. But if I strike you as insane, fair enough. I've been called far worse.
I think you are partially reading the data wrong.
i thought he was discussing swapping the lead form like 9 to 4 or something like that. my bust.
Yeah, a fraction of a percent more resistance which results in a fraction of a percent more voltage drop than other cells, which is all we are really talking about when we are talking about single digit mV differences during bulk. Not a problem on its own, but if any "balancing" occurs while that extra voltage drop is present it will compound issues.
Everything you're saying makes sense but I don't understand this statement. Every cell has two balance leads if you count the negative being connected to the positive of the adjacent battery via busbar. Cell 8 / Cell 9 is not unique in that regard, and I don't think JK-BMS wiring is unique, is it? Sorry if I'm misunderstanding.
Oh, that might only be a quirk on the JK PB BMS, it has 2 B8 terminals. Some theorize that is because the 16s balance circuit is built out of 2 8s balance circuits back to back, thus the second B8 is the equivalent of B0 on first 8s. Under that train of through the first B8 on connector 2 goes to cell 8 pos, and the second B8 goes to cell 9 neg, but there would be only the busbar voltage drop between these points and in practice they are usually connected directly together or the second B8 is omitted entirely (which implies they are connected together internally and you probably don't want any voltage difference between them.)
Bruh, first you say "The claim that the bus bar is influencing is testable. Just move the lead." Then 5 minutes later you say swapping leads is "insane." Generally speaking I've learned a lot from you but in this particular thread, between the emojis and the repeated use of the word "insane" with no explanation, I can't decipher most of what you're trying to say. But hey, feel free to chalk it up to me just being dense.
Oh gotcha I understand now. So you're seeing this similar cell 9 balancing issue on the newer JK PB model?
Moving the B8+ lead to the B9- lead is testable.
Well that's helpful to know. I still don't understand why this would be an issue that's unique to the JK-BMS. Or maybe it isn't, but I haven't heard of it before. Anyway, hopefully I'll start seeing enough sun that I can test and see if cell 9 can come into balance when the JK-BMS has finally been given enough time and the right voltage to balance.
Ok, that I can actually understand. Presumably that's what @sunshine_eggo was saying and I just didn't get it.
What is your start balance voltage set to? I had to set mine up to 3.42 (54.72), otherwise it started balancing under heavy charging. Even today (battery did not hit 90%, and never really charged super heavily) I hit 3.4v a few times with the battery under 90%.
Right, I said it.