16S 320A ANT BMS balancing question

[hasp]

Hi everybody,

i am currently designing and building a litte 2meter long 4x4 transport car thingy with 2 friends:

there is a ongoing ES build thread to be found here: https://endless-sphere.com/forums/viewtopic.php?f=34&t=114477

We have currently finished the battery pack, it is a 16s 100Ah LiFePo4 Pack with a 320A ANT BMS,
like this gentleman tested and liked here:

[youtube]im4ggvoni5M[/youtube]

however it does not seem to balance while charging,
despite "start balancing" at 3.1V and "start balancing voltage diff" at 0.002V

any ideas ?

thanks a lot in advance!
cheers,
alex

 

[j bjork]

My ant bms starts balancing when the current goes under 10A I think, but you can try to lower it a bit more and see if something happens.

 

[hasp]

Hi J,

our charger charges with 9.something volts in the lower of his 2 settings..

...so theoretically it should balance?

 

[j bjork]

My bms is not the same model, and I use li ion so not the same voltage levels.
Does it balance at all? Like close to end of charge when the current drops maybe?

 

[hasp]

havent checked that yet, as the rest of the car wont be finished that soon and i didnt wanna store the battery fully charged for long... (because lifepo4)

 

[dominik h]

You can start balancing manual.
I balanced my "used" 21S100Ah pack after assembling over four days without a charger attached to the battery.
My ANT started balancing only under 11A.

 

[randysway]

You would need an active balancer to achieve balance overnight.

If I recall, the balance limit on an ANT BMS is 200mA, assuming your board was well built.