I have 2 8s 24v 280 ah eve batteries that I built. Both running chargery BMS. Built around a year apart. I have been running them paralleled together for around 4 months. They are charged with 6 405 w panels and victron controller.
I only charge them to 3.40v. Everything was good until about a month ago. That's when the new pack #1 cell voltage would be off by .3 volts at top. Also noticed when battery is at 70% or so #1 is the lowest cell. All other cells are with in 5 mili volts.
So I contacted vendor to purchase 1 cell and told her my problem. Out of stock until end of June. She told me to move the cell to a different location in the battery. So I swapped 1 and 3.
Next day everything looked good and I was like that was easy. Well it was only a matter of time before it started again. Yesterday it was out 150 mili volts so I shut down solar and let it discharge some. It balances back out as the cells hit 3.33-3.34v. I then did a little reconfigure of some of my wiring tying them together and moved the main plug to draw from + of one and - of other. Before I had a 2 plug setup where I could unplug one battery and run off other. This did nothing to change the problem.
What is wierd is the older battery doesn't have this issue.
Any ideas or help?
Thanks
I only charge them to 3.40v. Everything was good until about a month ago. That's when the new pack #1 cell voltage would be off by .3 volts at top. Also noticed when battery is at 70% or so #1 is the lowest cell. All other cells are with in 5 mili volts.
So I contacted vendor to purchase 1 cell and told her my problem. Out of stock until end of June. She told me to move the cell to a different location in the battery. So I swapped 1 and 3.
Next day everything looked good and I was like that was easy. Well it was only a matter of time before it started again. Yesterday it was out 150 mili volts so I shut down solar and let it discharge some. It balances back out as the cells hit 3.33-3.34v. I then did a little reconfigure of some of my wiring tying them together and moved the main plug to draw from + of one and - of other. Before I had a 2 plug setup where I could unplug one battery and run off other. This did nothing to change the problem.
What is wierd is the older battery doesn't have this issue.
Any ideas or help?
Thanks