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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)

I think what’s going on is that the Chinese manufacturer gets something working on the floor without the big test; all variables the general public can come up with. In the meantime, management says to the team, “Thanks, you’re fired” or “Next project, don’t look back”. So now there’s a brain drain on the previous project. I have a bunch of the old style JK’s 20s , 24s and 4-8s and all have been working fine once I and the forum members figured out the quirks. Two things seem to hold true with this type of stuff from over there. Documentation is terrible and consider for the price, it’s disposable…. So buy spares.
 
andreit said:
That's not what the settings are for. I've explained them here:
Post in thread 'Anybody tried new JK BMS with inverter communication support?' https://diysolarforum.com/threads/a...rter-communication-support.68964/post-1224411
Click to expand...
or here
Y

Thread 'JK-BMS inverter type, internal resistance compensation, charge/discharge balance'

I have this theory:
The battery losses are affected by the internal resistance of the elements and busbars of the assembly.
JK engineers included a mechanism for compensating these losses in the capacity calculation, but did not explain how to use it.
The table with the internal supports of the elements must be filled with values. Then the BMS calculates the voltage of the cells depending on the current flowing through the batteries.
It's easy to check: remember the voltage value of the first element in the BMS application, now change its resistance to 10mOm.
The voltage in the application...
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Personally my experience has been different. Shenzhen Luyuan Technology Co is a Chinese company with exceptional sales, customer service and follow through. It doesn't match anything of the descriptions provided above. Yes I understand it might be the exception to the rule but it can happen.

Having said that, I think the focus is that @Nami has made an appearance indicating that a software update is on the way. I think the focus should be on that for this thread. Yes there are other threads about another BMS in development which looks interesting and other products but that would throw this thread off the tracks.

There are plenty of threads of poor quality products with poor support or support that has waned over the years. These come from all parts of the world.

There is a saying "fool me once, shame on you, fool me twice shame on me". I think what is being said here is that to date, JK has made promises that so far are empty. If a new shiny product is offered, given their track record, I'm not inclined to trust them. If they provide a software update that works, then in my mind they are on the way to breaking even.
 
This Thread has had several Side Trips that serve NO PURPOSE TO THE TOPIC/SUBJECT.

We ALL know there are Good | Average | Terrible businesses, including Manufacturers, OEMS/VARS & Vendors/Suppliers (REGARDLESS of Nation of Origin) - Welcome to 21st Century - continuing "business" as usual.

Human's - Businesses (EVERYWHERE !!!! ) Just want to make a profit and grow their business. Some do it well while others do not, some are deceptive while others are honest . All of these types are located right across the entire globe, without regard for Nationality, Race, Colour, Gender or any other damned idiotic metric/measure/Prejudiced Opinion or Label.

Who thinks that BOEING Corp is a Perfect Company that does not screw up ? Nor has it tried to cover up, explain, excuse, rationalize & justify nonsense & horse twaddle ? How about GM, Ford, VW, Mercedes ? Never any issues, problems or safety concerns that KILL - no Never ---

"HUMANS" Good to Bad, Beautiful to Ugly, Happy to Angry, Intelligent to Moronic. etc etc etc... ALL FIT IN THE SLOTS !
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TOPIC : JKBMS Problems with the Inverter Model BMS and the CRAPTASTIC Support & Interaction that has come about !
 
Wessss77 said:
I am also open loop with the AIO and utilize the built in cc. I don't have an issue with hitting full but maybe 5 days a year so soc stays current for me. The balancing works well and I haven't seen anyone say anything about the PCL not working in parallel setups yet this has been a known issue from jk since I bought these. I still have hope the issues will be fixed for the 14 and 15. Time will tell... Closed loop doesn't take all the parallel batteries into account and uses only the state of the master it whichever battery the AIO is plugged into so open loop is the only way it seems.
Click to expand...
You have rs485 communication active between the packs right?
But no rj45 cable between the master and the inverter right?
 
ghostwriter66 said:
I think I have been on this forum for about 5 years ... when i first started Solar I had zero idea on anything about it ... I was told by my company that I was going to transfer to South Texas and instantly become a solar expert ... its taken me 5 years just to stop blowing things up accidently ...

ANYWAY -- if you go back 5 years you will see that this forum as a whole has fell in and out of love with at least a dozen battery companies, and supplies, and BMSs ...

I still have a warehouse full of DALY's that was going to be the end-all-of-end-alls ... and then it was SEPLOS and then JK-BMS and I think 8 or 9 in between ..

same with batteries ...

same with vendors ...

same with battery boxes ..

A year from now it will be something else entirely ... what the Chinese just will never get is if they would just take a knee, listen to what the market is asking for, and then develop that - they could put everyone else out of business ... right now -- and for the last 40 years -- its been "Hey - just make the damn thing and sell it -- if it works great -- if it doesn't -- lets change something on it and try to sell it again until we get it right -- OR until one of our competitors gets it right and we copy it" ...
Click to expand...
Still is seplos V2 ( for me anyway ) ;)
 
AshleyL said:
The problem with China Chinese companies is......their "departmentalization".

I sourced my stuff from them and whenever there is an inquiry or issue, let me give an example, I had a problem with installation/configuration guide of an electrical motor/compressor and I contacted their support. So much for support that their support team (3 of them) said to me, "Bro, my job is to listen to your complaint, not to solve them."

Then, the other reply from sales team, "Mr, listen, my job is to sell stuff, not to listen nor record your complaints/feedback"

Once, I was able to get into contact with their engineering department and their reply, "Yes, we can modify this and fix it in software, but we gonna need our board of directors and account/finance department etc to approve it first" ----> Meaning it will never be fixed.
Click to expand...

That whole listen to your complaint and not solve them is at least honest. I have dealt with purchased high-dollar support contracts with "tier 1" computer vendors(both hardware and Linux OS) that their support's job is listen to your complaint and circle the wagons and blame it on something that you did or did not do, even when the bug is clearly 100% in their software, firmware or hardware. They won't tell you that is what they are doing, but consistently that was what they did. Once in a while I was eventually I was able to get them to fix it, but it was always painful and took a lot of time.

So the basic issue is 97-99% of support people don't understand their product (what it does or how it works--outside if it being "magic" and so cannot debug/fix anything) and as such fall back providing support and doing crap that will get you to quit bothering them. And it all tracks back to 95%+ of engineers, software developers are cookbook engineers and/or coding monkeys. Many of the suggestions are akin to an auto maker debugging your car not starting and telling you to change the dials on the AC/Radio to see if that makes it start, or telling you that the minor scratch on the trunk is the reason. They simply do not know there is no reasonable mechanism for what they asked/said to be true.
 
ghostwriter66 said:
I think I have been on this forum for about 5 years ... when i first started Solar I had zero idea on anything about it ... I was told by my company that I was going to transfer to South Texas and instantly become a solar expert ... its taken me 5 years just to stop blowing things up accidently ...

ANYWAY -- if you go back 5 years you will see that this forum as a whole has fell in and out of love with at least a dozen battery companies, and supplies, and BMSs ...

I still have a warehouse full of DALY's that was going to be the end-all-of-end-alls ... and then it was SEPLOS and then JK-BMS and I think 8 or 9 in between ..

same with batteries ...

same with vendors ...

same with battery boxes ..

A year from now it will be something else entirely ... what the Chinese just will never get is if they would just take a knee, listen to what the market is asking for, and then develop that - they could put everyone else out of business ... right now -- and for the last 40 years -- its been "Hey - just make the damn thing and sell it -- if it works great -- if it doesn't -- lets change something on it and try to sell it again until we get it right -- OR until one of our competitors gets it right and we copy it" ...
Click to expand...
I think the base problem is getting SOC right is hard, so at best we can hope that the reset code when voltages are high or low gets done often enough that SOC stays reasonably right, and that the BMS does not report 100% SOC when the voltages clearly indicate it cannot be 100%.

I worked with computer hardware, and it was 100% certain that ANY new product was going to be a disaster for 6+ months to may never work. It very much appeared that everything learned in the prior similar product was forgotten and they started from scratch. At my prior job the developers always claimed that there was a lot of unneeded crap in the code and they would fix it all by rewriting it, and any saying that failed to understand that that unneeded crap was often critical crap that at least 50% of the time was correctly added for a good reason. Shitty cookbook engineers and code monkey developers are supremely confident in their ability to do something correctly and are unaware of their complete lack of skill. Given all that if they can be guided to fix it to be good enough then you use it.

On an engineer the give away is that they cannot do basic home repairs at all. Even simple stuff. They understand the math but the often the theory itself is not understood and as such have zero feeling for how the math connects to the theory and connects to the real world.
 
I will be needing a BMS for 8S x 2P (16 x 3.2 volts x 320 AH cells, running 24 volts) battery. I need the BMS to handle 150 amps charge and discharge.

Can anyone boil this issue down with a good recommendation or two?

Docan offered a JK B2A8S20P. Is that appropriate?

Thanks in advance for your good thoughts.
 
Horsefly said:
Yes
Click to expand...
Thanks! Quick question ... it seems that this one can handle a lot more parallel strings than I will have.


Will these work correctly with a bunch of the cell connections not connected?

While I have you, do you think these normally ship with the cell leads?

Thanks!
 
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ReddyKilowatt said:
Thanks! Quick question ... it seems that this one can handle a lot more parallel strings than I will have.


Will these work correctly with a bunch of the cell connections not connected?

While I have you, do you think these normally ship with the cell leads?

Thanks!
Click to expand...
20P refers to 200A nominal current not to how many parallel cells it can handle.
 
andreit said:
20P refers to 200A nominal current not to how many parallel cells it can handle.
Click to expand...
Thanks very much. I guess the bottom line is that for 2 strings of 24 volts (eight cells each) in parallel. the BMS needs 14 balancing leads plus common + and - in and out, and for one 48 volt string, it would need 15 balancing leads, and that's what am trying to ascertain. Hoping I have this right.
 
fsg55 said:
Jikong > JKBMS > JKESS > what next?
They are getting closer and closer to the correct name of JkAss :LOL:.
Why do the chinese constantly change brand names? Are they trying to get rid of a bunch of accumulated dissatisfied customers? Or what?

Successful brands value their name and do not change it not just every two years, but for decades and centuries.
Click to expand...
I have seen in the software and hardware industry some don't fix bugs or issues, they increment the version number and start new improved?
also the sales department sells new and improved not bug fixes.
I don't own any of these JK Inverter BMS or batteries that contain them.
 
1000043536.jpg

It appears bms 2 and 3 I got a month later as my bms1 has 15.29 on it. Bms1 has 15.26 on it.

15.29 has 2 switches, ocp2 and 3, I cant find any info on it. Someone knows what this does?
 
Steve_S said:
ROFLMAO yeah, good example ! The Glossy sure looked nice at first, then people got them and realized they got suckered.
Renogy has a huge marketing & sales glossy look but absolute junk for product and they keep selling that shyte. If they spent 1/2 their advertising budget on product refinement they may actually have reasonable stuff but Noooooo !
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What is it specifically that leads you to say that Renogy products are junk? Who are the people that got suckered? I can attest to their poor customer service in terms of response time and other minor issues, but that doesn’t have anything to do with the quality of their gear.

Junk and, oh dear, shyte, are strong descriptors! I say inaccurate ones as well. Everyone was talking about JK, and then, boom: RENOGY IS JUNK AND SHYTE AND THEIR BUDGET IS LOPSIDED! Well tell us how you really feel Steve. Sounds like you got shitcanned or something 😂 seeing as you do have information about their advertising budget. I see Renogy gear all over. Their ad budget could be $50 and they’d still sell like hotcakes.

Opinion aside, Renogy is, without question, ubiquitous in the RVing community; and those people are generally quick to tell you if there’s a particular product or brand that has failed them. Or worked well.

To be clear, I don’t currently run any Renogy gear myself, outside of a single string of solar panels that used to feed into a Renogy MPPT, but now have a new master. They’ve always worked great.

Ultimately I cannot dismiss the literal hordes of Rvers, Van Lifers, and solar enthusiasts who don’t hesitate to enthusiastically recommend Renogy products, whether it be panels, inverters, batteries, or what have you. They might not have massive YT channels, but they are out there.

Alas, I realize the thread is concerning issues w JK products. I don’t really have much input to offer there I’m afraid . I’ve never used that junk in my life 👨‍🎨
 
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