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JKBMS Inverter Edition Problems/Issues | No Support / Help to fix major issues. - DO NOT BUY ! Warning (as of Oct.12.2024)
- Thread starter Steve_S
- Start date
it works for me, I feel like it's important to calibrate the voltage properly, I increased it by 10mv to properly engage the rcv timer. I still have trouble calibrating the current properly though, still a little drift of the soc.
Wessss77
Solar Enthusiast
No it will continue to have to pass the yes and no sequences or it continues to loop. This really allows additional time for balancing when the cells get out of balance...
RCinFLA
Solar Wizard
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- Jun 21, 2020
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I want to have the final say on how long my LFP batteries stay in elevated absorb voltage. I don't like the possibly of endless loops.
TheGreenThing_Jer
New Member
How come i dont see the new app features like rcv rfv timer display on the dash.. im using 4.29 app and 15.35 on bms
Voltage is easy to calibrate. I have a Fluke that I checked the calibration on with another Fluke temperature calibrator. DC voltage of the meter is spot on. I also got a good Fluke 362, which since it is new, should be calibrated already. But how do you enter the calibrating current into the JK if the numbers keep switching faster than you can read them and type them in? What is the proper way to do it?
You need a pure DC load (i.e., not an inverter).
Ok, that makes sense! I gave up on calibrating current up until now. Any recommendations on what to use for that?
If I'm reading the specs right on the Fluke 362, the resolution is only to .1 volts. So you'll never see more than one decimal place, right?
If so, that's the same resolution on my Fluke 325. I've been frustrated that I can't see more decimal places on the Fluke. I have to break out my Amazon special to see more decimal places.
Anyhow, my point is that I'm wondering if you can calibrate the voltage with only one decimal place on the screen.
I have a dedicated load from the lab for this, but you could use something like a bunch of lamps (12V from a car wired in series for example) until you have something around 10A draw.
Right. I was wondering what I have - 3 way refrigerator (12V/120V?gas), car headlight, etc. But they are all 12v. I do have 2 old 12v high power halogen spot lights and I might be able to get 2 more high beams out of the car and test that way. Could be 10 A draw. Will try. But can only test to 0.1A accuracy.
Yes, 0.1 A on that one.
Wessss77
Solar Enthusiast
You can adjust your RCV time to do that. If you want it to only have to hold that voltage for say 6 mins or 90 mins before it resets the soc to 100%. Once it hits 100% it will switch to float voltage.
prosier
New Member
Closed loop. Deye 12kw hybrid, lithium mode. 3x pack with JK200a, 15.35. The reset to 0% is different in this fw. Its not a big issue as I prefer not to see 0% soc in my Deye as it then goes into shutdown/reboot modes.
When reaching 1% soc, as soon as all 3 packs get in uvp, the mosfet is off (as it should). Deye has alarm message. Force charge is in display.
Whatever I set in the Deye, it wont charge!
Solution was to shortly set emergency switch to on in the bmsses.
Deye performed control board fw update in my deye. Next time soc is 0 or 1 I can check again.
When reaching 1% soc, as soon as all 3 packs get in uvp, the mosfet is off (as it should). Deye has alarm message. Force charge is in display.
Whatever I set in the Deye, it wont charge!
Solution was to shortly set emergency switch to on in the bmsses.
Deye performed control board fw update in my deye. Next time soc is 0 or 1 I can check again.
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Wessss77
Solar Enthusiast
disregard...to see them all you have to plug into the master and still can select device id1...my bad
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RCinFLA
Solar Wizard
- Joined
- Jun 21, 2020
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Make sure you have the RS485 addresses set up properly.
If you have cheap USB to RS485 converters that just ties 485 driver IC data direction line to serial TX data coming from USB to serial converter chip you have a weak RS485 logic zero drive. The twisted pair logic zero with these cheap USB to RS485 converters rely only on the 120 ohm termination resistors to pull a logic zero on the RS485. The 485 driver is tri-stated, hi-z during Tx logic zero bits.
Converters with FTDI USB to serial chips seem to always provide the required Tx direction control logic to 485 driver I.C making the 485 driver pull logic high and pull logic low on the balanced Tx output.
When you load the bus with more devices this weakens the logic zero drive on these cheap USB to RS485 converters. Also, long RS485 lines will have more trouble with data corruption.
If you have cheap USB to RS485 converters that just ties 485 driver IC data direction line to serial TX data coming from USB to serial converter chip you have a weak RS485 logic zero drive. The twisted pair logic zero with these cheap USB to RS485 converters rely only on the 120 ohm termination resistors to pull a logic zero on the RS485. The 485 driver is tri-stated, hi-z during Tx logic zero bits.
Converters with FTDI USB to serial chips seem to always provide the required Tx direction control logic to 485 driver I.C making the 485 driver pull logic high and pull logic low on the balanced Tx output.
When you load the bus with more devices this weakens the logic zero drive on these cheap USB to RS485 converters. Also, long RS485 lines will have more trouble with data corruption.
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Wessss77
Solar Enthusiast
So do you have a link to something like this? It kinda makes sense because I can generally get any 3 of the 6... Sometimes 4 but never anything more.
jorby
Solar Addict
Works for me but I only have 4 jk in parallel
EDIT: Previous link removed. I screwed up and posted a link to a usb to rs232 cable by mistake. Thanks to Wessss77 for bringing this to my attention! The actual cable that works came from the Solar assistant website. I am sure you can find them cheaper elsewhere, but this one works. Waveshare single and quad also work.
EDIT: Previous link removed. I screwed up and posted a link to a usb to rs232 cable by mistake. Thanks to Wessss77 for bringing this to my attention! The actual cable that works came from the Solar assistant website. I am sure you can find them cheaper elsewhere, but this one works. Waveshare single and quad also work.
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My logic was flawed. It is balancing at 2A all the time.Its just very inefficient at moving it to the lowest voltage cell
I have experienced two opposite situations with cells. One is discussed often, it it the "runner". It races to the to top ahead of the other cells and can causes the battery to stop charging prematurely.
The other is a "sleeper". It always lags behind the other cells and can never seem to catch up.
In both cases, I did a rebuild and replaced those cells with updated ones. This helped things run much tighter and the cell differences looked quite nice.
Steve_S
Emperor Of Solar
I Bulk/Absorb my bank of 6 packs to 3.475 Volts per cell with 1 Hour absorb time OR till WndAmps/Tailcurrent is reached at which point the system transitions to FLOAT which is at 3.445 Volts per cell. I start Ative Balancing at 3.42 and set the allowable deviation at 0.005.
By the time Absorb Ends and transitions to Float, there is never more than 0.025mv difference in my FrankenPack but within 15-20 Minutes of entering float ALL Packs are within spec and all cells are within 0.005 difference.
* Franken Pack has EVE LF280 V1 (tapped holes) & V2 (Post Terminals) with 2018 & 2019 Production dates. I run V1, V2 & V3 Packs and Bulk, B & A-Grade Matched Batched cells. Details buried in the thread.
My balance wires are ALL within 4 mOhms of each other (not shortened or lengthened), dry, double-crimped terminals.
All cells were Top Charged to 3.650 down to taking 2.8A (All my cells are 280AH) and then Parallel Balanced prior to assembly.
Prior to reassembly into the new cases with the new BMS, they were again Top Charged just to make sure and that's when I swapped out 3 weak cells I had and made the Frankepack (which worked out great).
Notes in MANY MANY places.... But taking shortcuts & not properly TOP Charging & fully activating the cells per Manufacturer Recommendations will result in charging differences (more imbalanced during) balancing & more. Any FLP cell that is NEW or that has been in storage for over 6 months after production use needs to be Top Charged to fully activate the electrolytes within and to "cook off" any gas pockets that can develop within the cells. YES, there is a small amount of space to allow for gasses generated between charging & discharging cycles. This is also a main reason to slightly compress the cells when assembled to prevent any gas pockets from developing which can result in "hot spots" and capacity losses. These are just Industry & Chemistry facts and I won't argue or highlight the facts & references again... Way beyond the Rule of 3.
Hope it helps & Good Luck.
FYI, this is OFF TOPIC for this thread which is about JK Not Supporting & Helping us and covering their butts with Horse Twaddle and partial truths.
Capt Bill
Sailing Options
I just saw the 48v LiFePO4 capable inverter type JK BMS for about $200 at Docan Battery in Texas vs maybe $120 for older non inverter BMS. I wonder where you get the $100 price, and how many days for shipping to USA? Also wondering: When Not interested in using network communication, what do you think the advantages are in the newer inverter type JK BMS aside from made to fit in a server rack case. ???
rogerheflin
Solar Enthusiast
$150 or so for the jk inverter bms + 4.3" LCD from aliexpress. 3 weeks shipping or so.
ArthurEld
Solar Wizard
Speak to Amy for the best price. You can get monitors or any extra pieces you need. Shipping takes 2 weeks.
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Steve_S
Emperor Of Solar
WELL WELL WELL End of 2024 has Arrived - so much for Nami's "fixed by October".
So here we sit with a Handicapped 15:35 & ??? No updated PC App that shows the extra info (and takes proper parameters).
Apparently new models of Other Brand BMS's are coming up with similar functions/capabilities BUT who's gonna risk it ?
Forget the Youtoobers hiding behind Paid Memberships or Company/Vendor backed "Influencers".
2025 is gonna be a year of many things that will be notable = Hope everyone has a firm grip on their Bippies.
Good Luck and Happy New Year to one & all.
This is still what is at the "Official Sup[port Site" LOL how lazy is that ?
So here we sit with a Handicapped 15:35 & ??? No updated PC App that shows the extra info (and takes proper parameters).
Apparently new models of Other Brand BMS's are coming up with similar functions/capabilities BUT who's gonna risk it ?
Forget the Youtoobers hiding behind Paid Memberships or Company/Vendor backed "Influencers".
2025 is gonna be a year of many things that will be notable = Hope everyone has a firm grip on their Bippies.
Good Luck and Happy New Year to one & all.
This is still what is at the "Official Sup[port Site" LOL how lazy is that ?
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