Old Seagull Man
New Member
Help with Top Balance.
I have to top balance 48 72 Ah cells.
They are all about 3.288 volts, or within the 3.287-3.289 range.
I have a good little 5amp bench supply and have chosen 3.6v as the balance voltage.
Enough to do the job voltage wise, but hopefully not high enough to cause problems.
But my calculations, make that approximately 50% state of charge.
I started with a batch of 8 cells but was getting nowhere. A I would need to put about 280Ah of charge into the cells, to get to 3.6v. about 60 hours charging time is my best guess.
So I took 4 cells and connected them in series, to try and speed up the charging, with a 14.6v 20amp charger. Thinking that if I could bring the cells up to about 3.5v. I could then put them back together and raise them up to 3.6v and get the job done slightly quicker.
After hour things were going well, but one cell began to run away, and reached 3.8v, so I gave that away.
The only other idea I have is to pickup one of those Meanwell type power supplies, as there are 20-30 amp versions of them. But I don’t know if the 3.5v version can be adjusted to 3.6volts, or the 4v turned down enough. If you have had anything to do with these please comment.
So if you have any ideas suggestion, or results of your own successes, Please put me on the right path.
Otherwise, I may never live to see these cells, balanced, Or, I certainly won’t be when they are.
I have to top balance 48 72 Ah cells.
They are all about 3.288 volts, or within the 3.287-3.289 range.
I have a good little 5amp bench supply and have chosen 3.6v as the balance voltage.
Enough to do the job voltage wise, but hopefully not high enough to cause problems.
But my calculations, make that approximately 50% state of charge.
I started with a batch of 8 cells but was getting nowhere. A I would need to put about 280Ah of charge into the cells, to get to 3.6v. about 60 hours charging time is my best guess.
So I took 4 cells and connected them in series, to try and speed up the charging, with a 14.6v 20amp charger. Thinking that if I could bring the cells up to about 3.5v. I could then put them back together and raise them up to 3.6v and get the job done slightly quicker.
After hour things were going well, but one cell began to run away, and reached 3.8v, so I gave that away.
The only other idea I have is to pickup one of those Meanwell type power supplies, as there are 20-30 amp versions of them. But I don’t know if the 3.5v version can be adjusted to 3.6volts, or the 4v turned down enough. If you have had anything to do with these please comment.
So if you have any ideas suggestion, or results of your own successes, Please put me on the right path.
Otherwise, I may never live to see these cells, balanced, Or, I certainly won’t be when they are.
