JK-BMS is reading only 3% SoC, but cells are averaging 3.317V each.
Where is it getting 3% SoC from?
The cell voltages are almost identical as they should be.
3.317
3.317
3.317
3.316
3.317
etc.
I thought it was doing something like taking whatever the UVP was, and if it was say 20% over that, it was 20% charged. No?Typically accuracy improves with additional cycles of charge discharge
I don't have a record of the exact numbers but yesterday or the day before it thought 3.3V was about 40% or in that ballpark. Now it thinks it's 3%? Makes no sense.then it's just a really shitty guess on the part of the BMS. A new install can't know the SoC, so it guesses. On a JBD, you can set voltage vs. SoC points to improve the guess. Not sure if you can on a JK.
I don't have a record of the exact numbers but yesterday or the day before it thought 3.3V was about 40% or in that ballpark. Now it thinks it's 3%? Makes no sense.
I doubt that it does. Fully charge it, let it balance, fully discharge it, see if it takes the expected number of AH to fully charge again.If it makes a difference here's the version info:
JK-B2A24S20P
Hardware version: V10.XW
Software version: V10.09
Version: V4.19.6
Yes, but to set it in stone as far as the bms is concerned, you need to charge till it trips that temporally lowered cell voltage protection(OVP) Once it’s done that the bms should remember that value. Just remember to move the protection value back once done.Figured out how to reset the number, no idea how accurate it is.
Basically you make a change to the battery capacity in the menu, and that seems to reset it back to a more sane number.
It now thinks I'm at 79% SoC.
Explained how to do it here:
(need to jump to 8:35 in the video if it doesn't put you there automatically)
Thanks again to Andy for his helpful videos.
I'm unclear why Andy moves protection back to 3.65V after he sets the "full charge" to be equal to 3.451V.Just remember to move the protection value back once done
Had to google this. "Xiaoxiang Smart BMS is a battery management system for electric vehicles."Xiaoxiang App
The Xiaoxiang app is only for JBD BMSs, not JK.Had to google this. "Xiaoxiang Smart BMS is a battery management system for electric vehicles."
So this app works with JK-BMS and you're saying it's better than using the stock JK-BMS app?
I'm unclear why Andy moves protection back to 3.65V after he sets the "full charge" to be equal to 3.451V.
If 3.451V is 100% full, isn't that where you want to stop charging?
To charge conservatively don't you want to keep protection kicking in around 3.45V? Or 3.55V?
I thought pushing the cells to 3.65V regularly wasn't so good for their longevity.
Apologies. I read JK and acted on JBD BMS. My bad. Sorry.Had to google this. "Xiaoxiang Smart BMS is a battery management system for electric vehicles."
So this app works with JK-BMS and you're saying it's better than using the stock JK-BMS app?
Sorry for the noob question, but by "hardware," in my case that means you want your AiO inverter to start and stop the charging, not the BMS, right?You set the BMS to the meaningful protection levels (3.65V/2.5V) and set your hardware to operate INSIDE those limits.
What if the owner/operator is a tender snowflake that melts if you look at them funny?These cells aren't tender snowflakes that will melt if you look at them funny.
But overthinking everything is how I overcompensate for growing up fat.Don't overthink it.