BMS is changing settings. Why?

[Watersmeet]

This has happened a few times now. Suddenly, my system is off and there’s no power coming out of the batteries even though they’re fully charged. I look at a BMS app and the discharge toggle is in the off position. It turns off all by itself. Why is this happening. I’m mostly using the Overkill Solar app. Is there a setting somewhere that will cause it to change that setting to off from on all by itself? I have two 280aH packs wired together in parallel, they each have their own JBD 120A BMS and it’s happening on both BMSs. Anyone know what’s causing this?

 

[42OhmsPA]

Does it happen near a full charge or under a heavy load?
The BMS is going into protection for some reason.

 

[Watersmeet]

So far it’s only happening when the batteries are fully charged with no load on them. Which setting is it that would cause such a thing to happen?

 

[Skypower]

Show us the upper and lower half’s of the settings page.

 

[Watersmeet]

Ok, thank you for your help. Here they are…

 

[42OhmsPA]

What voltage setpoint are you charging the batteries to?
I'm guessing one cell is running and triggering protection.
I don't see anything that stands out in your settings.
I would change your level 2 over voltage to 3650mv and under to 2500mv

Edit lvl 2

 

[Skypower]

Yeah I’m not seeing anything that jumps out at me. I thought that if it went into protection that it would give a reason why. Go to the bottom of the home page and view/shows us the events.

 

[Skypower]

What voltage setpoint are you charging the batteries to?
I'm guessing one cell is running and triggering protection.
I don't see anything that stands out in your settings.
I would change your level 3 over voltage to 3650mv and under to 2500mv

Say again? Level 2?

 

[Watersmeet]

This only seems to happen when I fully charge up to 14.5v with a 20A LFP charger (Renogy). The charger’s light turns green when the batteries are full, the battery monitor says 100%, the charge controller’s display it on like it always is… then I disconnect the charger and everything turns off. I check the app and the discharge toggle is off instead of on.

 

[Watersmeet]

Yeah I’m not seeing anything that jumps out at me. I thought that if it went into protection that it would give a reason why. Go to the bottom of the home page and view/shows us the events.

No events….

 

[Skypower]

This only seems to happen when I fully charge up to 14.5v with a 20A LFP charger (Renogy). The charger’s light turns green when the batteries are full, the battery monitor says 100%, the charge controller’s display it on like it always is… then I disconnect the charger and everything turns off. I check the app and the discharge toggle is off instead of on.

Can you reduce your charge to say 14.2?

No events….

Now if you didn’t do a reset, that’s just weird. It shows only one cycle.

 

[Watersmeet]

Say again? Level 2?

Thank you for helping. I’m sorry but can you please tell me more specifically which settings you’re suggesting for level 2 and 3? I see trigger and delay for level 3, which is over and which is under?

 

[Skypower]

Thank you for helping. I’m sorry but can you please tell me more specifically which settings you’re suggesting for level 2 and 3? I see trigger and delay for level 3, which is over and which is under?

For now don’t change those.

 

[42OhmsPA]

Say again? Level 2?

Edited. Thanks.

This only seems to happen when I fully charge up to 14.5v with a 20A LFP charger (Renogy). The charger’s light turns green when the batteries are full, the battery monitor says 100%, the charge controller’s display it on like it always is… then I disconnect the charger and everything turns off. I check the app and the discharge toggle is off instead of on.

14.5v = 3.625v per cell.
Agreed with @Skypower to reduce voltage.
Almost certain a cell is running and BMS is protecting.

 

[Skypower]

Your bms shouldn’t be disabling discharge at a high state of charge, unless it’s an over discharge current. That’s just weird. And the fact that it’s happening to BOTH BMS’s is doubly weird. The only thing in common is the charge and its source.

 

[Skypower]

Thank you for helping. I’m sorry but can you please tell me more specifically which settings you’re suggesting for level 2 and 3? I see trigger and delay for level 3, which is over and which is under?

Did your bms com with a little two pin plug/pigtail

 

[Skypower]

This is what I initially thought the problem would be but you have it disabled like it should be. I actually use it enabled with a toggle switch on the side utilizing the two pin plug. I was thinking of just shorting the wires on your pigtail(if you have it) and enabling the switch (when Yellow) to force the issue from a different direction.
Mine;

 

[Watersmeet]

Did your bms com with a little two pin plug/pigtail

Yes they did. Those are for if you want to wire an on/off toggle switch for the BMS, correct? I did not attach those.

 

[Skypower]

We just missed each other’s see above

 

[Skypower]

Yes they did. Those are for if you want to wire an on/off toggle switch for the BMS, correct? I did not attach those.

You shouldn’t need to. Im just grasping at straws now. And going out and trying it here, the app can still override the discharge to off but cannot override it to on if the contact is open in the switch. So I’m low on the confidence that it’ll keep it in discharge. I’m more leaning towards the charger and how it releases when it’s done.