BMS parameters

[Kwame]

Can anyone please check on the attached pictures and advice if parameters are correct from ANT BMS. First installation and I'm so so nervous almost frying my brain.

 

[MisterSandals]

What battery chemistry?
Looks like 16 cells arranged 2P8S

 

[Kwame]

What battery chemistry?
Looks like 16 cells arranged 2P8S

Lithium phosphate. And yes you're correct 2P8S. Attached is the state when I turn off charge from solar using MPPT charger.

 

[MisterSandals]

You need to keep your cells above 2.5 V and 3.65V

You have settings of 1.9V and the are way too low.

High cell alarm 3.61
High cell protect 3.63 (it’s conservative)

Low cell alarm 2.8V
Low cell protect 2.6V

High cell recover 3.60
Low cell recover 2.90

Total high voltage protect (3.63 x 8=) 29.04
Total low protect (2.6 x 8=) 20.8

I do not know max bal voltage limit. Guess 3.4V

 

[Kwame]

You need to keep your cells above 2.5 V and 3.65V

You have settings of 1.9V and the are way too low.

High cell alarm 3.61
High cell protect 3.63 (it’s conservative)

Low cell alarm 2.8V
Low cell protect 2.6V

High cell recover 3.60
Low cell recover 2.90

Total high voltage protect (3.63 x 8=) 29.04
Total low protect (2.6 x 8=) 20.8

I do not know max bal voltage limit. Guess 3.4V

Thanks a lot. I'll apply the recommend setting and see and monitor them.

 

[Kwame]

Adjusted

You need to keep your cells above 2.5 V and 3.65V

You have settings of 1.9V and the are way too low.

High cell alarm 3.61
High cell protect 3.63 (it’s conservative)

Low cell alarm 2.8V
Low cell protect 2.6V

High cell recover 3.60
Low cell recover 2.90

Total high voltage protect (3.63 x 8=) 29.04
Total low protect (2.6 x 8=) 20.8

I do not know max bal voltage limit. Guess 3.4V

Adjustment done and attached is the pics. But cell number 2 is still quite high. Should it be that high?

 

[Kwame]

You need to keep your cells above 2.5 V and 3.65V

You have settings of 1.9V and the are way too low.

High cell alarm 3.61
High cell protect 3.63 (it’s conservative)

Low cell alarm 2.8V
Low cell protect 2.6V

High cell recover 3.60
Low cell recover 2.90

Total high voltage protect (3.63 x 8=) 29.04
Total low protect (2.6 x 8=) 20.8

I do not know max bal voltage limit. Guess 3.4V

This is what it looks like now. I also noticed cell number is kind of behaving now.

 

[MisterSandals]

cell high recover 3.60
this is the voltage that a cell needs to get down to after a high voltage protect event.
If you hit high voltage protect, the BMS will shut down (disconnect) until all cells 3.60 or less.

Total high voltage protect (3.63 x 8=) 29.04

Start balance voltage 3.4

I do not know what max balance voltage means. Any info?

100% Soc will be more accurate (aligned with reality) at 3.45V or 3.50V
Your battery will handle more but the capacity over these numbers is negligible.

There are some sophisticated settings in this BMS. What BMS and charger do you have?
I probably should have asked this to start.

Also, if your cells are not well paired in you 8 2P sets, you may have issues with cells running away at high and low SoC. We can address this if you get misbehaving cell pairs.

 

[Kwame]

cell high recover 3.60
this is the voltage that a cell needs to get down to after a high voltage protect event.
If you hit high voltage protect, the BMS will shut down (disconnect) until all cells 3.60 or less.

Start balance voltage 3.4

I do not know what max balance voltage means. Any info?

100% Soc will be more accurate (aligned with reality) at 3.45V or 3.50V
Your battery will handle more but the capacity over these numbers is negligible.

There are some sophisticated settings in this BMS. What BMS and charger do you have?
I probably should have asked this to start.

Also, if your cells are not well paired in you 8 2P sets, you may have issues with cells running away at high and low SoC. We can address this if you get misbehaving cell pairs.

I'm using ANT BMS 16s 320a, and the solar charger is victron. After making the recommend parameter changes the battery behaved quite well until the sun went down. The culprit is still cell 2 hovering between 2.7v and 2.8v.

 

[MisterSandals]

The culprit is still cell 2 hovering between 2.7v and 2.8v.

If cell 2 discharges fastest and charges fastest, its the lowest capacity pair.
The best battery will have pairs composed of strongest cell with weakest cell, second strongest cell paired with second weakest cell...

 

[Kwame]

If cell 2 discharges fastest and charges fastest, its the lowest capacity pair.
The best battery will have pairs composed of strongest cell with weakest cell, second strongest cell paired with second weakest cell...

Update from parameter settings. After learning so much from you. I replaced the problem cell and also adjusted the start balancing value to 3.2v and the Ballance limit to 3.6v. (Not sure if the adjustment are ok any advice is welcome.) Everything seem to work quite well with cell differential ballancing kicking in when it should. I have been glued to the app and wanted to learn and I am glad to say I am more daring to delve into the Ballancing app compared to a few days ago when I was so scared to do so and not not knowing what to do. All is due to your advice and willingness to teach those who wants to know. This forum provides tons of information for the layman like me. I am sure I would be back with other problems as I am now trying to install a 48v system with 4v per cell EV battery in a remote and completely off-grid mode.

 

[whito]

hello, I have a question about setting up ant bms. how do I set the bms to turn off only charging and not discharging when the voltage of cells is different, thank you