Top Balance question

[Brett V]

Charger was on but zero movement on voltage into the cells when i checked

You don't know if current was going in to the cells or not. If your power supply/charger doesn't show current, you can use the clamp on meter in your pictures.

 

[offthetop04]

You don't know if current was going in to the cells or not. If your power supply/charger doesn't show current, you can use the clamp on meter in your pictures.

Last night I charged my pack up in series till the 12 cells were in the 3.60v range. Then pulled off the bus bars to the 4 cells and charged them each. They each took about 35-40AH each till the charger stopped and my meter read 3.55v. Each took about 2hrs. No idea why they wouldn't take the charge before.
Ill discharge the pack in series over night and charge tomorrow and see how they look.

 

[offthetop04]

Charger was on but zero movement on voltage into the cells when i checked

I didnt notice the AH input on the charger LOL I was just looking at the Voltage LOL

 

[Brett V]

No idea why they wouldn't take the charge before.

They were taking a charge but you couldn’t see it. I know it sucks to impatiently watch them sit there for almost two weeks when it appears there’s nothing happening, but those are big hungry cells and it takes a while to fill the tank. The 4 cells in question were at a much lower SOC than the other 12 to begin with. Since you’re almost there, I’d still recommend putting all 16 in parallel and and topping them off at 3.65.

 

[offthetop04]

They were taking a charge but you couldn’t see it. I know it sucks to impatiently watch them sit there for almost two weeks when it appears there’s nothing happening, but those are big hungry cells and it takes a while to fill the tank. The 4 cells in question were at a much lower SOC than the other 12 to begin with. Since you’re almost there, I’d still recommend putting all 16 in parallel and and topping them off at 3.65.

I ended up charging each of the 4 cells in question till the charger turned off. They were about 40AH away from full SOC each.
I didn't go back to parallel.
I ran one cycle and a different cell was discharging faster than all the others.
Went back through checked all my connections and found a loose-ish one. That helped but there was still a delta of 0.350 at 100% SOC
At this point i felt defeated to say the least.
After more videos and forum reads I decided to order a 5amp active balancer.
Installed it and to my amazement at 100% SOC my delta was 0.003!
In the mornings instead of 0% SOC im sitting at 50% SOC with the same overnight loads!!
All cells are staying withing 0,025 during the cycle.


I appreciate all the comments in this thread. I couldn't have navigated this with out everyone's advice!