Eve 280 battery weirdness after a year

[Simi 60]

Hi, a year or so ago we bought a batch of Eve280 A grade matched and batched cells from one of the recommended suppliers here.

Made 3 X 24v batteries connected as a single 840ah bank
Did it all by the book, top balanced, noalox, etc etc and they have been trouble free appart from Battery A always being slightly higher voltage, faster acceptance than B&C which are pretty much identical.

This morning things went noticeably weird when I checked on the app
Have tried on phone and tablet, both show same
Batt B&C are all equally voltage and around 70%
Batt A is doing this......

Thoughts on what's going on and what to do?

 

[sunshine_eggo]

Triple check your BMS sense lead connections

 

[Simi 60]

Triple check your BMS sense lead connections

Yep, just went down below and visually checked. Shot everything with laser thermometer and tested voltage on all cells.
All same and all seemed good.

Unplugged BMS harness, blue lights off and reconnected.
Blue lights on


Pic of reading now on app for batt A
Note SOC
Temp at batt with laser was 25c

 

[Simi 60]

Victron battery monitor is showing overall battery SOC is 77.4% and down -200ah from 840ah

Guessing the app/BMS needs a bit of time to recalibrate itself
Been so long since I needed to do anything I've forgotten the quirks found in the early days.

 

[sunshine_eggo]

Note that sense leads issues will never generate heat.

With the harness disconnect, you wiped the BMS state of charge info. It's going to need to be fully charged before it gets accurate again.

 

[BentleyJ]

Hi, a year or so ago we bought a batch of Eve280 A grade matched and batched cells from one of the recommended suppliers here.

Cell #2 voltage started to run up in the video then would fall back, looks like the balancer is doing a good job.

 

[sunshine_eggo]

Cell #2 voltage started to run up in the video then would fall back, looks like the balancer is doing a good job.

LOL... that's the best 30mA balancer in the world!!!!

 

[BentleyJ]

LOL... that's the best 30mA balancer in the world!!!!

Maybe its those Chinese electrons we know how they produce at least 2 to 3 times as much current as any other variety of electrons, at least according to the spec sheets.

 

[Simi 60]

And all appears normal again
Genset run this morning and solar finish and @ 11:30am all batts reading 100%.

Must have been a BMS brain fart.

 

[Alkaline]

Hi, a year or so ago we bought a batch of Eve280 A grade matched and batched cells from one of the recommended suppliers here.

So.... who? Who was it.

Thanks

 

[Simi 60]

So.... who? Who was it.

Thanks

Sorry for the late reply
It was
Shenzhen Luyuan Technology Co., Ltd
https://szluyuan.en.alibaba.com/

Fantastic service
Everything as advertised
Zero complaints.