Guru
Joined: 13/10/2014
Location: AustraliaPosts: 2228
| Posted: 02:16am 02 Jan 2024 |
I finally got another bank built and installed with BMS and active balancer.
These are fake EVE cells. 5 of these cells will go out of balance by around 200mv once charging gets above 3.5v per cell.
I spent some time top balancing them, it did improve but they will never match the others in the bank.
As long as one keeps away from that hockey stick part of the curve, these cells do not go over voltage, even without the active balancer.
Interestingly, it is only above 3.5v that they really differ. Once you draw current and the "no current" float voltage instantly drops, as it should, the cells will track withing 18mv even at 60A discharge. They also track on high current charge without any assist from the Active Balancer.
So I'm going to cycle them a few times and see how they go. I have some spare cells if needed, just a time consuming pain to test and match them.
Below: These are the Genuine EVE cells I bought - the only time the active balancer came on was when I was using it to top balance them, after that. it's virtually not needed.
Below: The 1st converted 4 x 12v battery's. These were "surprisingly" genuine EVE cells. I still have to change the Cell Links over to the ones I made, which are far superior to these thick hardened copper links.
Below: The 2nd lot of 12V batteries converted to 48V, I finished these yesterday.
They have my DIY links and I'm waiting for the screw in studs to arrive so I can ditch the stupid terminal screws.
