yes, it can but #2 cell is always the first cell to break 3.65 even with balancing starting early.Balancing at too low of a voltage can easily make the pack MORE imbalanced
yes, it can but #2 cell is always the first cell to break 3.65 even with balancing starting early.Balancing at too low of a voltage can easily make the pack MORE imbalanced
In your screenshot cell #2 is the lowest voltage cell so it's making it more imbalanced currentlyyes, it can but #2 cell is always the first cell to break 3.65 even with balancing starting early.
Set it to start balancing at the point where the highest cell is the "real" highest cell or else it will just end up making balancing take longeryes it can but Starb #2 is my hot cell and always reaches 3.65 first.
I just started charging with 24V.
View attachment 127661
Will post an after pic later today.
I only charge till Starb #2 hits max so the other cells can get more charge.There is no need to charge to 3.65V after the initial top balance .... If it were my packs, I would lower the "cell full voltage" setting down to 3.5 or so .... start balancing at 3.4, and only balance when charging.
ok, stopping at 3.5 would prevent me from getting concerned about the growing difference in cell Vs that happens after 3.5vThere is no need to charge to 3.65V after the initial top balance .... If it were my packs, I would lower the "cell full voltage" setting down to 3.5 or so .... start balancing at 3.4, and only balance when charging.
You are trying to get your BMS to control your charging. Your charge controller should control the charging.I only charge till Starb #2 hits max so the other cells can get more charge.
I have a Chinese, waterproof 40A charger that I specified to cut off at 28V.You are trying to get your BMS to control your charging. Your charge controller should control the charging.
What charge controller do you have? A good charge controller would let you bulk charge to 3.5Vpc and then absorb until the charge current stops.
Interesting, happen to have a link?I have a Chinese, waterproof 40A charger that I specified to cut off at 28V.
Here's the link (Alibaba). It comes standard charging to 29.2V but I asked for 28V.Interesting, happen to have a link?
28V is mighty reasonable at 3.5Vpc.
Any idea what the charge profile looks like?
90% of what?goes to 40A and stays till about 90%
Yea, that'd be mighty handy about now.I wish I'd ordered it with CANBUS so I could customize it.
I see 90% of battery charge on the BMSs about the time it drops from 40 to 13V. But I really don't know.90% of what?
Yea, that'd be mighty handy about now.
You're doing better than a lot of us did on our first build! You have not shown any disaster photos that most of us have (and don't always share).This is my first build.
If I knew then what I know now......
Thanks Mr. S. I was and still am scared silly of those caged electrons constantly looking for a way out. (don't drop the wrench!).You're doing better than a lot of us did on our first build! You have not shown any disaster photos that most of us have (and don't always share).
One of my favorites:
Good judgement comes from experience. Experience comes from poor judgement.
that's a good idea. Maybe this winter I'll open them up and perform a different type of cell balancing.You should try swapping cells. Move Port 1 & 4 to Starb. Move Starb 1 & 2 to Port.
Label your cells. I like using letters A, B, C... and take notes.
This might make your cells within each battery closer in capacity.
So far, in terms of capacity, you know:
P1 > P4 > P3 > P2
S3 = S4 > S2 > S1