Qnbbm balancer question


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daromer

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Its normal. Check My video about it.

I use batrium.
 

daromer

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I have 5 of Them... :)
 

jonyjoe505

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The high pitch noise is normal, after several weeks you don't even notice it anymore.


image_bdqqyl.jpg
 

Cherry67

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jonyjoe505 said:
The high pitch noise is normal, after several weeks you don't even notice it anymore.


image_bdqqyl.jpg

Thats the same with all loud noises..... :D :D just wait long enough.... (chuckle).

I have followed this
https://secondlifestorage.com/t-Good-Chinese-BMS-review

It is a complete BMS with balancer, cheap ( 30 $), seems to work quite well, as far as i have tested it, works from App and PC, is extremely flexible because you can change nearly just every parameter you want.

But, the App is just terrible in terms of operational surface.....
and the balancing current is quite low. But, for appropriate batteries i guess its enough.
 

Redpacket

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drbacke said:
Maybe its possible to open the balancers and put some insulation inside. Someone tried this?

I think they are potted in epoxy.... (if not, then maybedo that?)
 

daromer

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They are in epoxy yes. Dont insulate them more because they get hot when used.

if you dont like the sound just get better balancers directly or a proper bms.
 

Redpacket

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Maybe look at how much balancing is happening & why - maybe balance the packs capacities & look for any self discharging?
 

daromer

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They Will have the high pitch without any higher current being transferera.
 

drbacke

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daromer said:
They are in epoxy yes. Dont insulate them more because they get hot when used.

if you dont like the sound just get better balancers directly or a proper bms.

In your video you recommended the qnbbm balancers (thx for the nice video, it was very helpfull :) ), so which active balancers are in your opinion better?
I don't want to buy a bms, because I developed one myself on the basis of a Raspberry. It's quite simple, it's checking the pack voltages and the temperatures of each individual pack. If something is wrong with the temperatures or voltages, it will disconnects the whole battery from the rest of the system.
I can also watch the data live on my smartphone and webbrowser. The cost was about 100, mainlyfor the raspi and the power relay.



Redpacket said:
Maybe look at how much balancing is happening & why - maybe balance the packs capacities & look for any self discharging?

There is no balancing at all. The balancer makes this awfull sound in its normal state.
 

daromer

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There arent that many other balancers out there that only do balancing like above do. Above is one of the better stand alone units.
Most active balancers are complete with BMS functionality in my world.

There are a few others around on Ebay and such but I havent tested them myself.
 
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