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JiKong (JK) (Neey/Hankzor/HelTec/etc) Smart BMS with Active Balancer BT/Can/RS485 (Input Discussion pre-purchase)

I'm getting a pair of the 17S JK BMS to build two 12V, 2P4S batteries (i.e. one 12V 2P4S2P), using a 12V-48V booster to run them. (JK-BD6A17S8P, 0.6A balancing current, 80A continuous draw.)

wdv.jpg

There are no obvious mount points on the BMS in the photo. BigBrosMo's nifty bent bar technique doesn't seem an option as the BMS has cables from P- & B-, can others say what they have done to secure their BMSes?

Additionally, can owners please say whether their units came with the temperature sensor flyleads? I can't see anywhere in the specs that say the sensors come with the BMS (and I need them to shut charging at sub-5 degrees C)?
 
Shunt said:
I'm getting a pair of the 17S JK BMS to build two 12V, 2P4S batteries (i.e. one 12V 2P4S2P), using a 12V-48V booster to run them. (JK-BD6A17S8P, 0.6A balancing current, 80A continuous draw.)

View attachment 78976

There are no obvious mount points on the BMS in the photo. BigBrosMo's nifty bent bar technique doesn't seem an option as the BMS has cables from P- & B-, can others say what they have done to secure their BMSes?

Additionally, can owners please say whether their units came with the temperature sensor flyleads? I can't see anywhere in the specs that say the sensors come with the BMS (and I need them to shut charging at sub-5 degrees C)?
Click to expand...
It will come with the temperature leads yes.

Just looked at this unit on AliExpress... You could remove one side of the aluminum cover plate and then add some clips to it or use the same screw locations to replace with a new plate. Just a thought
 
Shunt said:
I'm getting a pair of the 17S JK BMS to build two 12V, 2P4S batteries (i.e. one 12V 2P4S2P), using a 12V-48V booster to run them. (JK-BD6A17S8P, 0.6A balancing current, 80A continuous draw.)

View attachment 78976

There are no obvious mount points on the BMS in the photo. BigBrosMo's nifty bent bar technique doesn't seem an option as the BMS has cables from P- & B-, can others say what they have done to secure their BMSes?

Additionally, can owners please say whether their units came with the temperature sensor flyleads? I can't see anywhere in the specs that say the sensors come with the BMS (and I need them to shut charging at sub-5 degrees C)?
Click to expand...
One of the videos on Off-Grid Garage, showed a 4mm threaded hole at each corner for mounting the JK BMS. Not sure if the model that you ordered has this but it is a place to start.
 
copec said:
I just came across this thread. I got a JK BMS right before the pandemic hit but accidentally let the magic smoke out, and while waiting four months for another one to ship I decided to go to a Nuvation that they were having a super-sale on. The JK is the absolute best inexpensive BMS there is! be very careful when plugging it in, if any of the exposed parts of the pins brush against any other pin other than the one it is supposed to be plugged into it instantly arcs and fries.

I have the RS485, CAN, and GPS modules still, if anyone wants the lot for the cost of shipping:
Click to expand...
If you still have them available I'd be happy to send you the dough to ship them my way. I live near Indianapolis.
 
Finally able to use my JK, 8S, 2A balancing. Figured I had to assemble the 24V battery first, for a quick charge before I did the top balance. But assembled it, charge it slowly using a 10A power supply and when there was a cell over-voltage, let it rest for a while, charge slower, did that a couple of times and the balancing worked perfectly. In the end, all cells were topped :)
 
The WHOLE KIT & KABOODLE arrived yesterday afternoon, well more or less.
The RS485 & CanBus modules were not shipped (Seriously Grrrrr).
Was told LCD Module was NOT available for the model I bought but now it is...
As per Post #1 I ordered these: JK-BMS [24S 2A 150A BT] with BlueTooth Part Number: B2A24S15P

edit, removed rest of post, it was a rant more or less,.
 
Last edited:
RayW said:
Further to my above and indeed first post here I have one other weird problem. I just added all the crimp connectors to the new BMS sensing lines and to my complete surprise for an 8S BMS I have 10 leads not 9 ??????? The BMS as you see in the photo I sent earlier has them labeled B- then as expected B1, B2...to B8 but finally the weird 10th connection marked B+ ?? Normally B8 goes to the positive on number 8 battery which is indeed the positive for the whole pack that connects to the load ?? So do I ignore one of these cables like B8 or the weird 10th one marked B+ or do I just connect BOTH B8 and B+ wires to the battery 8 positive tgerminal ?? This makes no sense and no user manual to refer to either as I said before. Never heard of a 9S battery pack either ????? Anyone ??
Click to expand...
For the BMS of b2a8s20p, please link the first one with the total negative pole and the last one with the total positive pole of the battery. Thank you
 
Does the JK by chance do a pwm soft start ? Or is a precharge resistor appropriate?
 
Mendok said:
Hello
I got mine a week or so ago.
The actual bms is very nice and working good.
I also bought the can bus module hoping to get it to communicate with my victron cerbo, that failed big time.
Doing a little research, i dont believe its true canbus??
I can confirm that it is transmitted something as my cerbo gx is receiving something
See pic
Click to expand...
every bms has it own protocol running over the CANBUS. it won't work without writing a specific driver for venusOS.
 
Steve_S said:
Digging through the JKBMS material it appears these do not have a PreCharge Circuit within, which in my opinion is a bit LAME given that any lithium battery pack will have to cope with Inverters powering up and taking that start surge. So I asked them what do they suggest to solve it and why is such omitted from the design. Hopefully I will get an answer today.

JKBMS with Active Balancer --to-- PreCharge --to-- Inverter.
HOW have you dealt with it ? Push Button with Resistor ? Automatic somehow ? How do you deal with it when no one is around and Inverter Cycles (batt connect/disconnect etc) ?

IF you think that PreCharge should be added to JK, they can be contacted here : https://www.jkbms.com/contact/
Click to expand...
https://www.jkbms.com/contact/
Unfortunately
This is not the official website of jkbms
You can view the logo shape on jkbms and the logo shape on the website. They are different,
 
@Nami Now that you have been on the forum a while, you will see there is a need for everyone to get the Exact Same Accurate information about the JK Product line. This is largely due to mixed information from different Vendors and out of date listings, as well as poor translations. I myself have been led on a Goose Chase for answers - which is holding up my own projects.

There is even a lack of clarity as to if an RS485 Module or CanBus Module is required or not and which LCD screen works or not.
Some of which you answered in this thread: https://diysolarforum.com/threads/jk-jikong-rs485-interface-wiring.35071/

IF you are indeed from JiKong then PLEASE do Introduce yourself and start the Thread with the Latest & Current up to date news & resources. If you would like input from our membership here on product improvements, ideas and dare I say Used Documentation, people here can be most helpful and we have done so before with other progressive manufacturers.

Thanks,
Steve
 
Steve_S said:
@Nami Ahora que ha estado en el foro por un tiempo, verá que es necesario que todos obtengan la misma información exacta sobre la línea de productos JK. Esto se debe en gran parte a la información mixta de diferentes proveedores y listados desactualizados, así como a traducciones deficientes. A mí mismo me han llevado a la búsqueda de respuestas en la Goose Chase, lo que está retrasando mis propios proyectos.

Incluso falta claridad sobre si se requiere o no un módulo RS485 o un módulo CanBus y qué pantalla LCD funciona o no.
Algunas de las cuales respondiste en este hilo: https://diysolarforum.com/threads/jk-jikong-rs485-interface-wiring.35071/

SI usted es de JiKong, POR FAVOR preséntese y comience el hilo con las noticias y los recursos más recientes y actualizados. Si desea obtener información de nuestros miembros aquí sobre mejoras de productos, ideas y me atrevo a decir Documentación usada, la gente aquí puede ser de gran ayuda y lo hemos hecho antes con otros fabricantes progresistas.

Gracias,
Steve
Click to expand...
(y)
 
OffGridGuy said:
I ordered both the RS485 and CanBus modules. I was a little surprised that both units have 4 pin connectors, meaning both are meant to plug into the RS485 socket (but only one at a time).

My goal was to play with the CanBus interface. As a retired firmware engineer, I'm always looking for something to play with..... But I'm not really disappointed. I'll eventually research it, but I doubt that there is any data coming down the can interface, that is not also available on the straight RS485 interface....
Click to expand...
Did you try to disassemble can unit? I don't have can unit but picture on ali say about CAN_H and CAN_L lines but no data on these lines. I found another pinout for can connector https://secondlifestorage.com/data/attachments/15/15578-aab950425e300cfd12eca41955395889.jpg but no vbat on my connector, i didn't try it. Is it possible connect CAN bus to bms without can converter?
 
Well @Nami has not returned to answer.

BOTTOM LINE - My JK Purchase = NIGHTMARE !
I got the BMS' but not the RS485 & CanBus modules...
NOW they "SAY" They being Mr Wang of JiKong in China that these modules are NOT Needed that you only need a Pigtail wire harness...
Then other contradictions pop up Here * on Vendor Sites ...
NAMI Showed Images that state these are optional ports / functions so how do we KNOW what we have... Ohhh there is no way to know THAT'S HOW.... The many mixed Postings by Many Vendors akso do not entirely JIVE and leave much to be desired for Information...

SADDEST PART OF THIS ! I asked Amy Wan of Luyuan to obtain the batch, with the required accessories and more bits, pieces etc needed to complete my final build and now 2 months of this KRAP I am finally PISSED OFF ! Amy tried her best and got Screwed by the idiots at JiKong !

I also have to get all New Butt-Splices, Terminal Ends because the wires are AWG the Splices & Terminals are Metric (AWG a bit bigger so Metric No Freakin Use) but at least she did send me the 4AWG Silicone Wire. Butt Splicing the Two 7AWG leads from B- & P- to a single 4-AWG Extension for the Ring Terminal extensions. ANOTHER PEEVE, 1/2 the BMS wires had the protective tips removed and so they are Frayed & must be cut back, which is a major PITA with teh ultray fine high capacity wire.

LESSON LEARNED: Find a Vendor who has everything in stock and that it is all compatible & serviceable and buy at one time from someone like HankZor. As for Help from/by JK Standard Issue KRAP ! Especially if they won't even post their presence as a Company & Rep here like others have done...

Possibly @upnorthandpersonal whose has been using these for ages can clarify if these RS485 & CanBus Modules are needed or not "now" or what the dealio is... I need to put the remaining packs together and am forced to get parts from Digikey (ouch $$$) cause I'm outta time piddling with this.


1644949781318.png
 
Steve_S said:
Possibly @upnorthandpersonal whose has been using these for ages can clarify if these RS485 & CanBus Modules are needed or not "now" or what the dealio is... I need to put the remaining packs together and am forced to get parts from Digikey (ouch $$$) cause I'm outta time piddling with this.
Click to expand...

Ok, here is where the vendor communication issue comes from: RS-485 and CAN are provided by external modules. These modules convert the existing TTL/UART signal to these protocols. So vendors are correct: if you need RS-485 for example, you need the modules so that the TTL signal becomes an RS-485 signal. However, since most people want to connect these BMSs to their computer/R-Pi/what have you over USB, you don't need to go through those external modules first: you can just take the TTL signal and convert it to USB right away with a TTL to USB dongle.

This is by the way also why older RS-485 adapters don't work with newer BMSs: the baud rate changed, so the micro controller in the older adapter that is to hard coded to 9600Baud now can't work with newer versions of the BMS that run their ports at 115300Baud.
 
Steve_S said:
@Nami Now that you have been on the forum a while, you will see there is a need for everyone to get the Exact Same Accurate information about the JK Product line. This is largely due to mixed information from different Vendors and out of date listings, as well as poor translations. I myself have been led on a Goose Chase for answers - which is holding up my own projects.

There is even a lack of clarity as to if an RS485 Module or CanBus Module is required or not and which LCD screen works or not.
Some of which you answered in this thread: https://diysolarforum.com/threads/jk-jikong-rs485-interface-wiring.35071/

IF you are indeed from JiKong then PLEASE do Introduce yourself and start the Thread with the Latest & Current up to date news & resources. If you would like input from our membership here on product improvements, ideas and dare I say Used Documentation, people here can be most helpful and we have done so before with other progressive manufacturers.

Thanks,
Steve
Click to expand...
Jkbms has three shapes,
The BMS of 60A and 80A (bd6a-17s / 20s / 24s-6p and bd6a-17s / 20s / 24s-8p) has only the default RS485 function and LCD interface,
BMS of 100A, 150A and 200A (bd-6a20s / 24s-10p and b1a-20s / 24s-10p and b2a-24s-15p and b2a-24s-20p) only has the default RS485 function and LCD interface,
Among them, b2a-24s-20p-can BMS has built-in can function,
There are two other BMS models of 200A, b2a-4s-20p (not yet produced) and b2a-8s-20p, which only have the default RS485 function and LCD interface,
If there are many needs, we will consider them
Steve_S said:
@Nami Now that you have been on the forum a while, you will see there is a need for everyone to get the Exact Same Accurate information about the JK Product line. This is largely due to mixed information from different Vendors and out of date listings, as well as poor translations. I myself have been led on a Goose Chase for answers - which is holding up my own projects.

There is even a lack of clarity as to if an RS485 Module or CanBus Module is required or not and which LCD screen works or not.
Some of which you answered in this thread: https://diysolarforum.com/threads/jk-jikong-rs485-interface-wiring.35071/

IF you are indeed from JiKong then PLEASE do Introduce yourself and start the Thread with the Latest & Current up to date news & resources. If you would like input from our membership here on product improvements, ideas and dare I say Used Documentation, people here can be most helpful and we have done so before with other progressive manufacturers.

Thanks,
Steve
Click to expand...
 
We have cancelled the can module and built the can module into the b2a24s20p as a new model. B2a24s20p-can, this BMS is connected from the CANbus interface. Customers can extend and connect other devices according to their own needs,
 
Steve_S said:
Well @Nami has not returned to answer.

BOTTOM LINE - My JK Purchase = NIGHTMARE !
I got the BMS' but not the RS485 & CanBus modules...
NOW they "SAY" They being Mr Wang of JiKong in China that these modules are NOT Needed that you only need a Pigtail wire harness...
Then other contradictions pop up Here * on Vendor Sites ...
NAMI Showed Images that state these are optional ports / functions so how do we KNOW what we have... Ohhh there is no way to know THAT'S HOW.... The many mixed Postings by Many Vendors akso do not entirely JIVE and leave much to be desired for Information...

SADDEST PART OF THIS ! I asked Amy Wan of Luyuan to obtain the batch, with the required accessories and more bits, pieces etc needed to complete my final build and now 2 months of this KRAP I am finally PISSED OFF ! Amy tried her best and got Screwed by the idiots at JiKong !

I also have to get all New Butt-Splices, Terminal Ends because the wires are AWG the Splices & Terminals are Metric (AWG a bit bigger so Metric No Freakin Use) but at least she did send me the 4AWG Silicone Wire. Butt Splicing the Two 7AWG leads from B- & P- to a single 4-AWG Extension for the Ring Terminal extensions. ANOTHER PEEVE, 1/2 the BMS wires had the protective tips removed and so they are Frayed & must be cut back, which is a major PITA with teh ultray fine high capacity wire.

LESSON LEARNED: Find a Vendor who has everything in stock and that it is all compatible & serviceable and buy at one time from someone like HankZor. As for Help from/by JK Standard Issue KRAP ! Especially if they won't even post their presence as a Company & Rep here like others have done...

Possibly @upnorthandpersonal whose has been using these for ages can clarify if these RS485 & CanBus Modules are needed or not "now" or what the dealio is... I need to put the remaining packs together and am forced to get parts from Digikey (ouch $$$) cause I'm outta time piddling with this.


View attachment 83919
Click to expand...
If there is a great demand in the future, we will also consider adding can function to b2a24s15p to become a new model b2a24s15p-can, which depends on the needs of customers
 
upnorthandpersonal said:
Ok, here is where the vendor communication issue comes from: RS-485 and CAN are provided by external modules. These modules convert the existing TTL/UART signal to these protocols. So vendors are correct: if you need RS-485 for example, you need the modules so that the TTL signal becomes an RS-485 signal. However, since most people want to connect these BMSs to their computer/R-Pi/what have you over USB, you don't need to go through those external modules first: you can just take the TTL signal and convert it to USB right away with a TTL to USB dongle.

This is by the way also why older RS-485 adapters don't work with newer BMSs: the baud rate changed, so the micro controller in the older adapter that is to hard coded to 9600Baud now can't work with newer versions of the BMS that run their ports at 115300Baud.
Click to expand...
Check your BMS if the version is in V6 After X, his communication frequency is 115200baud,
If not, his communication frequency is 9600 baud
 
Nami said:
Check your BMS if the version is in V6 After X, his communication frequency is 115200baud,
If not, his communication frequency is 9600 baud
Click to expand...

Yes, I know that. That's why the older RS485 module doesn't work with newer BMS versions. The micro controller in the old module expects 9600Baud.
 
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