JK bms fast(er) SOC learn
- Thread starter Skypower
- Start date
In the newest software version 11.288 one of my friends bms, i found new features like SOC-0% and SOC-100% voltage. On version 11.25 this function not exist. So, should be the way to some how update software version to the newer one by rs485 port and PC, because by the app on IOS at least it’s not possible at the moment.
I tried to contact support by email with this question, still waiting for reply. Any suggestions?
I tried to contact support by email with this question, still waiting for reply. Any suggestions?
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squowse
Solar Enthusiast
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- Jan 4, 2021
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Could you clarify the new feature?
He has LG chem e63 batteries LI nmc from hyundai kona
As I understand you set starting point Voltage and SOC 100% voltage of your battery. And between those two voltage you have 100% of your battery SOC. Assume that bms calculate Soc much accurate
squowse
Solar Enthusiast
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- Jan 4, 2021
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That sounds like SoC estimation by voltage.
GXMnow
Solar Wizard
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I would like it if they would just set an upper pack voltage that would set it back to 100%
That would work well for both LFP and Li NMC. Since I am only charging my NMC cells to 90%, it should know that when I stop charging at just 56.7 volts, it is my "100%" or even better, tell it to insert the value 90%.
On LFP cells, if they are help over 3.5 volts per cell for more than 30 minutes, they are essentially full.
Once it resets the 100% mark, use the coulomb counting to report how much is discharged out.
Having a low voltage setting is not a bad idea either. IF we are not going to run our cells to true zero, set this to the minimum voltage you want to be your zero. When it hits that, it can show zero % but still stay connected and working as long as the cells are still safe.
I think my JK-BMS sort of did this when I made it go into a low cell voltage warning. It did jump up to 100%, but it then took my lowest discharge point as zero so it now thinks my batter has half the capacity. It's a good thing I am not using the JK's SoC number for anything.
Berseker
New Member
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- Mar 22, 2020
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Yes, observed this as well..had to replace a damaged bms due to my carelessness..and the replacement bms didn't have the soc % voltage isssh. i use same phone for all my jk bmses, so the issue is hardware based on the bms itself, not software....
there shud be a way to update the firmware on the bms. i like having that soc % function
GXMnow
Solar Wizard
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Something interesting happened today.
We had really good sun exposure, so my system easily topped up the battery bank. At the start of this year, I changed out my BougeRV charge controller for a Victron Smart MPPT 150/35. It has made it into absorb mode a few times, but today was a bit different. It was in absorb for a full 45 minutes. The cells in my battery are vrry well balanced, and I am only charging to 57.6 volts. So the 14 Li NMC cells in series were all at just a tick over 4.11 volts. Ove voltage protection in the BMS is set to 4.20 volts, so I know I didn't hit it, but it does look like the SoC finally did reset to near 100% all on it's own. The house load has been running off of the battery for nearly an hour, and the SoC is only down to 95%. 2 weeks ago, it was at 4.1 volts per cell and only showing 57% SoC. It obviously has re-calibrated to some extent. It will be interesting to see if it can hold a reasonable reading now.
We had really good sun exposure, so my system easily topped up the battery bank. At the start of this year, I changed out my BougeRV charge controller for a Victron Smart MPPT 150/35. It has made it into absorb mode a few times, but today was a bit different. It was in absorb for a full 45 minutes. The cells in my battery are vrry well balanced, and I am only charging to 57.6 volts. So the 14 Li NMC cells in series were all at just a tick over 4.11 volts. Ove voltage protection in the BMS is set to 4.20 volts, so I know I didn't hit it, but it does look like the SoC finally did reset to near 100% all on it's own. The house load has been running off of the battery for nearly an hour, and the SoC is only down to 95%. 2 weeks ago, it was at 4.1 volts per cell and only showing 57% SoC. It obviously has re-calibrated to some extent. It will be interesting to see if it can hold a reasonable reading now.
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