JoeyJibJab
New Member
Hi guys. I just recently built my 2p8s 400ah 24v battery bank, I built it without doing an initial top balance because I wanted to see how it went before forking out the money for a power supply. All the cells were at 3.31-3.32v before assembling. Everything looked okay and the BMS read all voltage had very little cell differential. That is until I put a load on the pack.
If I pull a 1500w load (50ish amps), the cell drift can be quite extreme. The worst cell for example can read 3.31v, and during a 1500w load can drop to 3.1v. These cells were advertised as grade A but obviously aren't. I'm hoping that the large cell drift is somewhat due to me not doing an initial top balance and that some of the cells charge levels differ quite a bit, which might account for the large cell drift. But was wondering, if all the cells read 3.31-3.32v before a load is placed, can that still indicate that some of the cells capacitys differ?
Hope that makes sense ?
If I pull a 1500w load (50ish amps), the cell drift can be quite extreme. The worst cell for example can read 3.31v, and during a 1500w load can drop to 3.1v. These cells were advertised as grade A but obviously aren't. I'm hoping that the large cell drift is somewhat due to me not doing an initial top balance and that some of the cells charge levels differ quite a bit, which might account for the large cell drift. But was wondering, if all the cells read 3.31-3.32v before a load is placed, can that still indicate that some of the cells capacitys differ?
Hope that makes sense ?