When they show “Equalizationvol” in the app that’s the one you want, but as far as I know that feature is only available in android and not apple. “Sleep voltage” and “start voltage” are useless. You want to start balancing above 3.4V. Disconnecting any of the wires to control it remotely results in having to restart it through the app so that’s a no go.(fault is not an automatic restart). Be careful there’s a lot of Neey and rebranded clones that run all the time (or have a crazy .300v differential between start and sleep.
280Ah cell top balancing
- Thread starter atti
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Capt Bill
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Wow to up to 50 Amp charge adjustable down to 3.65 top balance voltage. That 50 Amps would be allot faster on a 3.65v top balance charge ... as compared to the common 10 Amp max Bench power supply. Re Top Balance charging; I have had problem when a new defective cell just would not charge up beyond 3.35v; and it was holding back the voltage of my top balance attempt of my whole paralleled 280Ah LiFePO4 set of 8 cells. That was a personal time sucking learning curve that took awhile for me to figure out. Also: I have learned to watch more closely >3.4 volts (listed as > 99% SOC on one reference chart I use), because the next phase goes up fast to 3.6 or 3.65v. ... To get up closer to full charge before top balancing; ... I have used my 14+v LiFePO4 x 50 amp charger a few times with no BMS. A danger exists for quickly peaking single cells above 3.65v/ I think when seeing >3.4 v readings. I put sticky tape on the cells to write down the voltages I see as I get towards fuller charge. ... I then disconnect battery charger before any cell hits 3.65v (though some have slipped up to 4.0 or 4.2 v/ which I quickly drain back down to 3.65v / which is IMO: ... definitely not good, but also not a cell killer. .... Doing a resent Top Balance on an older set of 280AH Eve LiFePO4s that had some brief <2.5v cycles (from my learning curve mistakes) to see if I can get a better match for even cell voltages through full discharge and charge cycles ... I might replace worst cell or two with new/ as I have being seeing some peakers cells going up >3.65v early setting off BMS triggers, and one cell w less AHs showing at lower voltage with volt drop and big diff at low 23.3 -24v part of my battery bank spectrum. Wondering how long folks leave their Top Balanced battery sets sitting for Best Top Balance Results ??? ... Been thinking / overnight is likely good . ADDED NOTE from closer later look ... The top balance 50Amp charger option covers 2.6volts to just 14.7v. or 2 -15v ... Not up to the 29.4v listed at top of description
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I’ve top balanced two ways. With a very powerful power supply @ 3.65 volts and with finesse, a smart active balancer or bms. The latter I much prefer. It’s less work, safer and can be assembled and be done with it.
With a big power supply parallel method, it can be done relatively quickly for production but there’s more assembly/disassembly and initial cost. The other way is to simply series
bulk charge to a near full state of charge with a balancer capable of a relatively high balance current (2 to 4 amps) even a small cell voltage differential(delta). Jk bms ( build in) or Neey type (auxiliary) balancer. The idea is to keep raising the state of charge three or four times with intervals that give the balancer time to equalize the cells, finally ending with all the cells near 3.65 volts per cell. It sounds like it’ll take a long time but the whole thing will probably take 3 to 5 hours for sixteen (48v) 300ah cells and a 2 amp balancing current. Here’s the picture of my retired 100 amp @ 3.65 power supply that’s probably going to be used in testing jumpers and buss bars at 400 amps for short duration.
With a big power supply parallel method, it can be done relatively quickly for production but there’s more assembly/disassembly and initial cost. The other way is to simply series
bulk charge to a near full state of charge with a balancer capable of a relatively high balance current (2 to 4 amps) even a small cell voltage differential(delta). Jk bms ( build in) or Neey type (auxiliary) balancer. The idea is to keep raising the state of charge three or four times with intervals that give the balancer time to equalize the cells, finally ending with all the cells near 3.65 volts per cell. It sounds like it’ll take a long time but the whole thing will probably take 3 to 5 hours for sixteen (48v) 300ah cells and a 2 amp balancing current. Here’s the picture of my retired 100 amp @ 3.65 power supply that’s probably going to be used in testing jumpers and buss bars at 400 amps for short duration.
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