Battery active balancer - extra balancer in på with JK BMS 200A 16s (non-Inverter model)

[Mahendra Gomanie]

 

[silverstone]

Well from Andy's video the NEEY will only watch the average voltage, NOT the maximum voltage.

Then it's useless for my case where one cell shoots up dramatically while all others are stuck at 3.38V or so.

 

[silverstone]

Not sure if Heltec Active Balancer would do better

https://www.aliexpress.com/item/1005005594375155.html?spm=a2g0o.detail.pcDetailTopMoreOtherSeller.2.72966b63czkTnt&gps-id=pcDetailTopMoreOtherSeller&scm=1007.40000.327270.0&scm_id=1007.40000.327270.0&scm-url=1007.40000.327270.0&pvid=bb3c23e0-5450-40c0-95d0-8156d6caa850&_t=gps-id:pcDetailTopMoreOtherSeller,scm-url:1007.40000.327270.0,pvid:bb3c23e0-5450-40c0-95d0-8156d6caa850,tpp_buckets:668%232846%238108%231977&pdp_npi=4%40dis%21DKK%21795.26%21596.45%21%21%21116.12%2187.09%21%402103245417107774573305442ed5b8%2112000035046272513%21rec%21DK%21%21AB&utparam-url=scene%3ApcDetailTopMoreOtherSeller%7Cquery_from%3A

 

[Mahendra Gomanie]

i don't think it will be useless since it will trigger balancing.

 

[silverstone]

Well actually this is the latest video from Andy about the NEEY I guess

 

[silverstone]

i don't think it will be useless since it will trigger balancing.

When my BMS will already have disconnected. But yeah, maybe with inverter communication it could work. It's a bit of a hack on top of a hack though

 

[houseofancients]

I think I have a battery that is quite problematic to charge and holds the other battery back. One cell constantly hits OVP early on... Now I'm trying to add inverter communication to the jk bms, but that won't change the physical issue... One battery will always hold the other one (or several other) back.

At the same time retrofitting another balancer into this battery will require some non-trivial mechanical reworking. Which might actuly require to transplant the cells into another battery box anyways...

At least for the future batteries I'm currently building, I think it's therefore a good idea to include an extra active balancer PERMANENTLY connected.

What are good options (ideally up to 10A real no matter what the voltage difference is, I. E. not only 10A with 1V difference etc)?

- JK-B10A24S not manufactured anymore?
- NEEY???

One must-have feature is the ability to set the start balancing voltage (I use 3.45V based on Andy from off grid garage), not to let it balance all the time.

Thanks for the help

Neey will tick all your boxes

 

[silverstone]

Neey will tick all your boxes

I'm not sure 6A vs 2A will even be enough to be honest.

Right now the jk bms is struggling.

But is the 4th gen NEEY using the average (like the 3rd gen in Andy video from off grid garage) or the maximum cell voltage to start balancing ?

 

[houseofancients]

I'm not sure 6A vs 2A will even be enough to be honest.

Right now the jk bms is struggling.

But is the 4th gen NEEY using the average (like the 3rd gen in Andy video from off grid garage) or the maximum cell voltage to start balancing ?

I only use 4a 4rth generation.
You can set start, stop and volt difference as parameters without issue

 

[silverstone]

I only use 4a 4rth generation.
You can set start, stop and volt difference as parameters without issue

Yes but for the start voltage... Does it use the average or maximum cell voltage to start balancing?

3rd gen had a "feature" (I'd call that a bug) that only if the AVERAGE cell voltage was above the start balancing criteria, then it would start balancing.

It should be the MAXIMUM. But I didn't understand if they fixed that in the 4th gen...

 

[houseofancients]

Yes but for the start voltage... Does it use the average or maximum cell voltage to start balancing?

3rd gen had a "feature" (I'd call that a bug) that only if the AVERAGE cell voltage was above the start balancing criteria, then it would start balancing.

It should be the MAXIMUM. But I didn't understand if they fixed that in the 4th gen...

Maxium

 

[silverstone]

Maxium

Did you check / test that?

 

[houseofancients]

Did you check / test that?

Of course

As matter of fact, I did so today , asI added 2 new boxes to my pack

 

[silverstone]

Of course

As matter of fact, I did so today , asI added 2 new boxes to my pack

2 boxes to your pack?

You mean you added 2 full new batteries? Or 2 extra cells on each?

 

[houseofancients]

 

[silverstone]

View attachment 202888

I also got to build 2 extra soon... Need to figure out where to put the NEEY on these and probably will have to think about retrofit later to the other batteries

 

[houseofancients]

I also got to build 2 extra soon... Need to figure out where to put the NEEY on these and probably will have to think about retrofit later to the other batteries

I use a 3d printed holder, that I bold on to the pressure plate, middle screw
Leaves plenty of space for the BMS and cooling, but prevents stuff moving around

 

[silverstone]

I use a 3d printed holder, that I bold on to the pressure plate, middle screw
Leaves plenty of space for the BMS and cooling, but prevents stuff moving around

I was thinking for the new battery of some plywood mounting plate... Old battery probably hanging somewhere... Aren't there some screw holes on the back of the NEEY?

The jk bms also has some tiny screw holes in the back...

 

[houseofancients]

IAren't there some screw holes on the back of the NEEY

There are not..
Closed little box

Used Velcro in the past, but eventually they would come loose

 

[silverstone]

There are not..
Closed little box

Used Velcro in the past, but eventually they would come loose

I guess I'll use some 90° bracket and / or cable ties then.

 

[houseofancients]

I guess I'll use some 90° bracket and / or cable ties then.

Neey balancer wall mount with vent by Tueftler_

This is a wall mount for the popular Neey balancer of e.g. LiFePo4 cells.Included air ventilation openings.Easy to print.Have fun of printing that!

www.thingiverse.com

 

[silverstone]

Neey balancer wall mount with vent by Tueftler_

This is a wall mount for the popular Neey balancer of e.g. LiFePo4 cells.Included air ventilation openings.Easy to print.Have fun of printing that!

www.thingiverse.com

Looks neat. Is it yours? I don't have a 3d printer though...

 

[silverstone]

Otherwise this one with mounting bracket from jk bms? Not sure about the settings etc though


B1A16S B2A16S 1A 2A 5A 10A Li-ion Lifepo4 JKBMS Equalizer with BT JK-B1A24S JK-B2A24S

https://a.aliexpress.com/_EG0srLP

 

[houseofancients]

Looks neat. Is it yours? I don't have a 3d printer though...

No, but this is what I use.
Friend of mine has a 3d printer, and trading for some help with his solar system gets me all the holders I want

 

[houseofancients]

Otherwise this one with mounting bracket from jk bms? Not sure about the settings etc though


B1A16S B2A16S 1A 2A 5A 10A Li-ion Lifepo4 JKBMS Equalizer with BT JK-B1A24S JK-B2A24S

https://a.aliexpress.com/_EG0srLP

Don't know these, so couldn't tell you how and if the jk works