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

[Steve_S]

(BMS is not enclose)
So you’d recommend 100A instead of the 200A version?
I want to be able to charge it with two or three 60A SCCs so I figured I should go with the 200A version.
I only have 16cells

It all depends on the cells you have. If the cells are over 200AH then use a 200A BMS and Keep It Sweet & Simple !
Remember that Standard LFP can discharge happily at 1C and take 0.5C Charge. The 200A BMS will let you draw up to a max of 200A and charge at 100A ). Just because the BMS & Battery Pack "can" deliver 200A it does not mean it has to. For example with my 7 Packs with 200A BMS', none of them ever see heavy loading as such but each pack can carry the load on it's own if necessary. The heaviest household load my system "may see rarely" is between 150-175 Draw and for only a short period of time.

Also a note, that a 4S, 8S or 16S can deliver 200A but the length of time of course is affected by the pack Size & Voltage

 

[Skypower]

Hard to go wrong with the 200 amp version. Do remember to pre charge just before you close the breaker/connect fuse. These don’t have a pre charge circuit.

 

[xylo]

(BMS is not enclosed)
So you’d recommend 100A instead of the 200A version?

When Skypower wrote "I would consider halving the continuous rating to be safe and perhaps less if the bms is enclosed", I think they meant that if you buy a 200 amp version, only consider it to be safe/reliable only up to 100 amps.
So, yes, buy the 200 amp version, but don't run it at 200 amps.

That is my non-expert interpretation.

 

[xylo]

Do remember to pre charge just before you close the breaker/connect fuse. These don’t have a pre charge circuit.

Can you please explain this? I am replacing batteries in my existing solar power system in my RV. I am connecting new 8s Eve cells (24v) that each read 3.25v on my meter, not connected to anything. Tomorrow I will hook up the BMS to the battery bank for the first time. If that looks OK, I'll connect to a solar controller and panels. If that looks OK, I'll connect to my 4000w inverter.
I'm not sure if you're suggesting that I do anything different by "pre-charging".
(FYI: I'm not interested in inverter communications at the moment. I just want the battery bank to work properly/safely.)

 

[Hedges]

Inverter Disconnect Switch with Precharge

Jun 4, 2020

Inverter Disconnect with Precharge

• FilterGuy
• Inverter's

 

[xylo]

Inverter Disconnect Switch with Precharge

Jun 4, 2020

Inverter Disconnect with Precharge

• FilterGuy
• Inverter's

Interesting. I currently have a Battle Born Current Surge Limiter in my system, since my prior batteries were Battle Born. Will this Current Surge Limiter take the place of the pre-charge? I think they do two slightly different things, but the goal is the same.
FYI: My inverter is a Magnum MSH4024M, 24v, 4000 watt.

 

[Hedges]

Yes.

Current Surge Limiter

Do you have Battle Born Batteries in your rig? Does your system have a 4kw or greater inverter? Then protect your system with our Current Surge Limiter!

battlebornbatteries.com

https://battlebornbatteries.com/wp-content/uploads/2019/01/Current-Surge-Limiter-Quick-Guide-CSL-r03.pdf

Thread 'Battle Born Current Surge Limiter: Anyone using one?'

Aug 15, 2022

Saw this on the Battle Born site:

https://battlebornbatteries.com/product/current-surge-limiter/?fbclid=IwAR3xwU7vIIPlJ9iNSFZ8oqJ261fzsiKPksSPkO9iYCXD71C6_MnJl4Usg9M#:~:text=The CSL500 Current Surge Limiter,3.5kW

Here's how it's wired:



$280 is steep but it would sure help wife proof my RV setup.

Anyone using one? I have one in my cart and ready to...

• corn18
• Replies: 13
• Forum: DIY Solar General Discussion

 

[Steve_S]

We will solve this problem,
At the latest by October.

POSTED September 28 and it is now October 11.

All we got was Minimal information from your Good Friend Andy @ Andy's Garage on Youtube.
Then our Vendors contacted your reps (this week) with images of the new BMS and they said it wasn't JK's but then another when pressed admitted it is a new Hardware BMS.
So now also telling "stories" to your own vendors ? (not the first time).

Congratulations: JiKong has managed to lose a Great Deal of Face and has seriously harmed it's reputation.
Also consider, that THIS Message thread started on August 5, now has 758 Messages and over 27,000 Views (globally +)

 

[Wessss77]

Quicky update SORTA !

- Apparently there is a New Hardware Version coming ! (Source - Andy @ the Garage) oivey
- Supposedly will have accurate shunt/coulomb counter etc...
- New Firmware is supposedly going to be issued for V15 & V14 hardware.... (bandaid over borked hardware). Ohhh Boy !
-- funny part, Andy directs everyone to the General JK Email (dead-head address) for support - Too funny (not).
hehehe, he's become the unofficial mouthpiece...

WHY is it that we have to wait on the Austrian living in Australia to get information & updates ?

GOTTA ASK : (Please just a simple answer of YES I would and have X # of BMS to replace.)
Would ANY of you replace a V14 or V15 with the new model IF it actually works as advertised ?
How many JK-BMS' do you have in your fleet ?

My Answer:
NO, unless some major change/occurance forced me to.
I have 7 Operational & 1 Spare. All JK-200A V15.

I have 16 in use...10 of the 100amp (15.30)and 6 of the 150amp (15.24)...I just bought and installed in the last 6 months...I am not looking to spend another $2000 to replace them all after only 6 months of use...I need them working as designed!

 

[goldserve]

I gotta say, I was tempted in getting the inverter bms but it would have been more problem than what it’s worth. Since we are DIYing battery packs, the YAMBMS that aggregates all the jk bms data and implements its own CVL, CCL, and whatever algorithm you can dream of can be accomplished. https://diysolarforum.com/threads/y...new-cut-off-charging-logic-open-source.79325/

 

[JJJJ]

A new product is NOT the solution we were promised.

@Nami how is the software update coming?

 

[yur43]

Can I ask?
Is it possible to expand the system with a pylontech us2000c JK battery?

 

[goldserve]

Can I ask?
Is it possible to expand the system with a pylontech us2000c JK battery?

If you configure your system to use 15 cells instead of 16 and maybe give up some smarts/communication, the pack will work on a purely voltage base, sharing the load and expanding the system by the nature of parallel configuration.

Some things that come to mind is if you still use the pylon communications, it won't know about the added capacity so the SOC might be wrong. It also won't add up charge and discharge currents but you may not care if you already have enough batteries in parallel.

 

[Steve_S]

I have 16 in use...10 of the 100amp (15.30)and 6 of the 150amp (15.24)...I just bought and installed in the last 6 months...I am not looking to spend another $2000 to replace them all after only 6 months of use...I need them working as designed!

My bank of 7, are all 200A JK-Inverter HW 15 currently staying on 15:27.
I run Open Loop - No Interactive AIO, I am component based with Midnite Classic SCC's & Samlex Inverter.
Packs are connected between themselves.
SOC is utter crap but MOOT as I do not have to rely on what the BMS thinks. Love the ability to use EndAmps to transition to Float.
The Active Balancing in the Inverter model IMO is better - more efficient. Compared to the previous models which were in my fleet.... the ones I wrote the Manual For.
The Built-In Precharge also works the treat, tested with 1 pack and of course with full bank ON as well. (ok full bank is a cheat so)

AND of course No Response from NAMI who WAS online when I posted my last msg. How Telling !

 

[Steve_S]

@Nami are you actually going to respond to this Important Thread or will posting nonsense in a separate thread out of context going to be the New way to support your clients ?

This is utterly useless and irrelevant to why you need to be here.

Thread 'High edge drive and Low edge drive'

Oct 12, 2024

High side drive (HSD) is to add a controllable switch at the power end of the circuit to drive the load by controlling the switch of this switch. The design of high side driver is more complex than that of low side driver under the same conditions, and nMOSFET is usually used as the power element.
Low side drive (LSD) is a controllable switch added to the ground terminal of the circuit, which is controlled by closing the ground wire. The low side drive is easy to realize and the circuit structure is simple. It is mainly composed of MOS tubes and a few resistors and capacitors, which is...

• Nami
• Replies: 2
• Forum: BMS (Battery Managment Systems)

• 

 

[AshleyL]

@Nami are you actually going to respond to this Important Thread or will posting nonsense in a separate thread out of context going to be the New way to support your clients ?

This is utterly useless and irrelevant to why you need to be here.

Thread 'High edge drive and Low edge drive'

Oct 12, 2024

High side drive (HSD) is to add a controllable switch at the power end of the circuit to drive the load by controlling the switch of this switch. The design of high side driver is more complex than that of low side driver under the same conditions, and nMOSFET is usually used as the power element.
Low side drive (LSD) is a controllable switch added to the ground terminal of the circuit, which is controlled by closing the ground wire. The low side drive is easy to realize and the circuit structure is simple. It is mainly composed of MOS tubes and a few resistors and capacitors, which is...

• Nami
• Replies: 2
• Forum: BMS (Battery Managment Systems)

• 

Hmm? Seems like a description on how will the new BMS work.........which is not what we want.......

 

[Steve_S]

WELL - DO NOT BUY JKBMS AT ALL will now be the message to forward.
This Message Thread title changed accordingly.

Well Done NAMI & Friends.

 

[Quattrohead]

I think you need to be a bit more subtle than this, it is going to cause problems for the forum. Previous title seemed appropriate.

 

[Steve_S]

I think you need to be a bit more subtle than this, it is going to cause problems for the forum. Previous title seemed appropriate.

I started this thread on Aug.05 with a set of polite options to respond and nothing came even well after the 2 weeks deadline to respond "something" and we got silence. Onwards & forward nothing got better (responses etc) and we got excuses and nonsense etc...

This won't affect the forum, it's a thread I started. As for "subtlety" it is quite ineffective as has been shown plain & simple clear & direct also has little impact/effect. This applies to very simple & clear statements that cannot get messed up with Translation Software (another excuse shot there for them).

No, Subtle, and even simple does not work. NOTHING seems to sink in for JK & its folk.

 

[Wessss77]

My bank of 7, are all 200A JK-Inverter HW 15 currently staying on 15:27.
I run Open Loop - No Interactive AIO, I am component based with Midnite Classic SCC's & Samlex Inverter.
Packs are connected between themselves.
SOC is utter crap but MOOT as I do not have to rely on what the BMS thinks. Love the ability to use EndAmps to transition to Float.
The Active Balancing in the Inverter model IMO is better - more efficient. Compared to the previous models which were in my fleet.... the ones I wrote the Manual For.
The Built-In Precharge also works the treat, tested with 1 pack and of course with full bank ON as well. (ok full bank is a cheat so)

AND of course No Response from NAMI who WAS online when I posted my last msg. How Telling !

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.

 

[ghostwriter66]

Yup, all of them are doing it to get rid of accumulated dissatisfied customers.
Other reason being they cannot be too successful. Let just say China government tends to take notice of such success. Tax, duty, tariff etc.....or worse case, being "nationalised" without being officially nationalised......

In China nearly all of the Energy, Utility, Power and Telecommunication (ie batteries and BMS, etc) are nationalized, particularly in those key sectors. Even if they don't own it outright -- like the US MAFIA, they have a vested "piece" of the company and a voice within it ... and they are sure to be getting their money off the top..

I think in the states we call them UNIONs ...

BUT as I have said before -- the Chinese overall do NOT care about DISSATISFIED customers -- its just not how we grew up -- you just care about meeting quota -- keeping your head down - getting through the day -- and we have all seen that attitude for years on the products discussed on this forum ...

I am still amazed daily that Americans think that the Chinese mindset is like theirs. That customer service, pride in work, honesty, etc is even part of their daily group-think. Most of them (lets say 99%) are all just trying to keep their heads down, make the pennies on the dollar Americans make, and survive until tomorrow.

IF they did have a collective mantra - then it would probably be "OH well - we tried" ...

 

[Quattrohead]

Ghosty... My favorite saying for America is "do as I say not as I do." From a Brit.

 

[Hedges]

Company/department I work for is in the US, and staff is predominately Chinese, Korean, Taiwanese. Some colleagues immigrated from China and are naturalized citizens, some are here on visas and have to go home periodically to renew.

Not volume low-cost products like these BMS, rather very high end capital equipment. Some of these Chinese staff, PhD's, give us seminars on the physics of how SEM work, also other staff from Eastern Europe do similar. We put a great deal of effort into addressing any issues.

Very different mindset, when a company lives or dies based on the ongoing success of their customers.


For us DIY types using these BMS, seems we can identify one model and firmware revision that has a reputation for doing what is needed in conjunction with our equipment and use that. But can't depend on future compatibility or promises.

For a few of us, that seems to be JK PB2A16S20P running closed loop with Sunny Island.
I let others suffer through the learning pains before dipping my toes in the water.

(I had always meant to use REC, figured what's $800 compared to cost of 4x Sunny Island. But since I'm using 4s CATL packs rather than individual cells, I can't assemble 8p16s. Will be 16s8p. So for cost reasons I'm using JK. I feel better about separate BMS per string of cells, anyway.)

 

[AshleyL]

Very different mindset, when a company lives or dies based on the ongoing success of their customers.

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.

 

[ghostwriter66]

For us DIY types using these BMS, seems we can identify one model and firmware revision that has a reputation for doing what is needed in conjunction with our equipment and use that. But can't depend on future compatibility or promises.

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" ...

The problem with China Chinese companies is......their "departmentalization".