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diy solar

JKBMS Inverter Edition Problems/Issues | No Support / Help to fix major issues. - DO NOT BUY ! Warning (as of Oct.12.2024)

prosier said:
If I believe the video from Andy...15.30 or 32 is the best till now right
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Seems some of the people in this forum are reverting as mentioned a few threads up. Andy is very specific with Victron integration. Doesn’t seem like they will ever fix the SOC drift and SOC charge trigger issue.
 
ChrisG said:
Seems some of the people in this forum are reverting as mentioned a few threads up. Andy is very specific with Victron integration. Doesn’t seem like they will ever fix the SOC drift and SOC charge trigger issue.
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Ill already have the m5 soc fixer solution ready to plug in, hoping this will help.

Besides of that I have a Deye hybrid and was guessing to flash 15.32 this week.
 
prosier said:
Ill already have the m5 soc fixer solution ready to plug in, hoping this will help.

Besides of that I have a Deye hybrid and was guessing to flash 15.32 this week.
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I have a Solark 12K and I look forward to hearing some success stories.
I'm able to make my batteries work without closed loop with very little effort.
 
Why is it so important to get the SOC to be accurate? Don't a lot of these pre-built server rack batteries that don't even have screens not provide that info?
 
rhino said:
Why is it so important to get the SOC to be accurate? Don't a lot of these pre-built server rack batteries that don't even have screens not provide that info?
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Because with comms, it reports that back to the inverter, and the inverter adjusts charging based on that, I think.
 
SparkyJJO said:
Because with comms, it reports that back to the inverter, and the inverter adjusts charging based on that, I think.
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I'm not even clear how that works if you have 10 EG4 server rack batteries for instance how can it handle if one battery says 100% and another 95%? There has to be some fudging going on with those as well.
 
rhino said:
I'm not even clear how that works if you have 10 EG4 server rack batteries for instance how can it handle if one battery says 100% and another 95%? There has to be some fudging going on with those as well.
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Master battery aggregates the data - typically an average.

However, any single cell in any connected battery can reduce CCL (charge current limit), or trigger OVP or LVP.
 
prosier said:
what does "closed loop" mean? (sorry or it is my to direct Dutch translation :P )
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"closed loop" is when your BMS tells the inverter the battery state of charge.
But we can tell the inverter to always charge to whatever voltage we want. And the BMS will stop the charging if anything goes wrong.
Closed loop is kind of slick but not necessary. I'll have closed loop someday but I don't care much when.
 
ArthurEld said:
"closed loop" is when your BMS tells the inverter the battery state of charge.
But we can tell the inverter to always charge to whatever voltage we want. And the BMS will stop the charging if anything goes wrong.
Closed loop is kind of slick but not necessary. I'll have closed loop someday but I don't care much when.
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Actually it is a lot more than that, and it saves you equipment and is a safety feature
 
rhino said:
Can you elaborate on how it is a safety feature?
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For me, my BMS (Batrium) communications are the primary and secondary means of protection. It will also be the tertiary when I get around to it.

I basically have operating and critical limits.

Primary: When my operating limits are reached, my BMS communicates to my equipment that charging must not occur. This occurs based on cell/system voltage and high/low temps. The MPPT can still output current to power loads, but no surplus for charging.

Secondary: When critical limits are reached, my BMS activates the control relay that disables output of the inverter/chargers and the MPPT at the high limits and turns off inverter at the low limit. This also occurs based on cell/system voltage and high/low temps.

Tertiary: When critical limits are reached, my BMS opens a relay disconnecting my battery from the system (eventually).
 
As of 08:45 EST 23.09.2024 the JK "official" software repo shown below.
BE CAUTIOUS With Patches & Versions coming from "who knows where" which is an "extreme" invitation for Murphy's Laws to be applied !


1727095866908.png
 
I hope jk take time to build the fw that fix all current issues. Let's wait... Sometime it's better to not hurry in sw developpement.
 
Surprisingly & shockingly Andy mentioned THIS Forum... I'm positive a few had the same reaction I did when he did that...

He made an important point in his last video in regards to his 1st Bank & the NON-Connected BMS's doing exactly what they ought to when thing are properly setup. It is also one of the Rare Moments he mentions TailCurrent and it's application for transitioning to Float.

Quite Right when he covered how the Victron uses Voltage+Absorb Timer, TailCurrent (Amps being taken by batteries) to validate 100% SOC. DO I needed to go back and QUOTE a post which suggested this for the JKBMS giggles.

IRONY is the JK Inverter BMS could do that !
1) The BMS can read the Voltage @ Terminals & AVG Cell Voltage. AVG Voltage = better for using User Set 100% SOC Voltage.
2) It can read Inflow AMPS own to 0.2A. It can determine the EndAmps/Tailcurrent by doing the fast math of (xxxAH * 0.05 = TailCurrent)
----NB 0.05 is for Pack Level TailCurrent/EndAmps
3) Does not need to be "Absorb Mode Aware" as such. It only needs to know when Pack AVG Voltage = 100% SOC Setting and wait till EndAmps/TailCurrent read TailCurrent value to send the REQUEST FLOAT VOLTAGE signal.

The Coulomb Counter (hardware) in the JK is crappy ! It cannot resolve below 0.2A which represents losses in both directions as it is not registered & counted. This will most obviously affect SOC Accuracy if the batteries do not reach 100% SOC & Reset and will accumulate over time. THAT's the GOTCHA ! If you are on the equator and hit 100% SOC daily or even every 2nd day, the SOC drift wouldn't be that bad, but after 3-6 Months of not hitting 100% Daily the drift will be abysmally inaccurate. High Precision Coulumb counting can be done but at a Cost which may add $10 to the cost of the BMS (personally, I'd be OK with that IF it was truly accurate) *not that I will replace my fleet of BMS' if they issue a new HW Version.

-----------------------------------------
#SOC-100_User_Val = 3.450 (user set in BMS)
#SOC-0_User_Val = 2.800 (user set in BMS)
#Pack_AH_Val = 280AH (internally calculated 280x0.05=14A)
--
I won't bother with the pseudo code which is simple enough.
 
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