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

OffGridGuy said:
Hi Steve,



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....



My 8S unit came with 5mm screw-in connectors, so I can use about any type of wire I want. The 8S version does not have the problem that Andy has.

I'm also MidNite Classic 150 user and will use this BMS with it.

Enjoy !!
Click to expand...
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
 

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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...
I'm not a Victron User so not paying that much attention BUT I recall seeing Cerbo Drivers for JKbms'on Github. I don't recall if their were from JK or 3rd party though. There is stuff for HASS.io and other as well.
 
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:
 

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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. It’s 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...
Just curious but what is the purpose of the gps module for a BMS... What's the use case for that for a battery?
 
BigBrosMo said:
Just curious but what is the purpose of the gps module for a BMS... What's the use case for that for a battery?
Click to expand...
I think they intended it for small EV application - so to track how far it has traveled and where it has been?

They offered them all to me for cheap at the time, so I figured why not, I might play with it at some point.
 
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...
What part of the world you located in??
 
RayW said:
Okay my problem is that this new BMS comes without the B- and P- cables attached unlike the 16S and bigger in this family of BMS's as shown in Andy's YT videos Looks like though the 4 connection B- and P- points are in fact threaded holes but I cannot be sure as I just noticed in time before I started using a heavy duty soldering iron (im 76 and my eyesight is not as good as it used to be !!). Has anyone here yet got any experience with connecting the B- and P- cables to this new 8S model? I hope that up at the local hardware store tomorrow (by local I am a retired Brit HNC qualified electronics engineer living in Thailand) I can find a suitable sized set of bolts and washers to ascertain it is indeed a threaded connector socket. Either way I have some good quality expensive copper stranded 100A cable for this purpose with heavy duty crimp connectors at the ready.

Attached is a couple of photos showing this very nicely made solid BMS and the B- connection sockets which appear threaded. the more I look the more I am sure they are indeed threaded. Wish I could get a user manual for this 8S model, even in Chinese.
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This is the model I have too, but without the Heltec sticker. The threaded holes is m6, as far as I can tell. I wouldn't try soldering, but crimp two 25mm2 or 35mm2 cables and bolt em.
 
Martijn said:
This is the model I have too, but without the Heltec sticker. The threaded holes is m6, as far as I can tell. I wouldn't try soldering, but crimp two 25mm2 or 35mm2 cables and bolt em.
Click to expand...
They are M6. I used two rigid pieces of copper and attached B- to the negative battery terminal, bending the copper over the side of the battery to mount the BMS and then used a short piece of copper to directly attach my battery monitor shunt to P-. Makes the whole unit rock solid and manageable!
 
BigBrosMo said:
They are M6. I used two rigid pieces of copper and attached B- to the negative battery terminal, bending the copper over the side of the battery to mount the BMS and then used a short piece of copper to directly attach my battery monitor shunt to P-. Makes the whole unit rock solid and manageable!
Click to expand...
Ah yes, using solid copper to a shunt or single crimped connector would be even easier. :)
 
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/
 
I used a spare 10A DC breaker and 50 Ohm 100W resister I had around. I would just flip it on and then count to 10 and then flip the battery cutoff to on and turn off the breaker.
 
UPDATE: JkBMS support Line = No Response even to direct mail questions and their webforms for contact do not work.
Email sent yesterday @ 06:30 now 25.5 hours later and not a peep, and considering I want a batch of these - Hrmph....

APPARENTLY, the B2A24S15P models come with a pair of short 7 AWG Silicone Jacketed wires on both B- & P-. Combined 7AWG = 4AWG. BMS Sense leads are apparently 22 gauge but it is NOT clearly stated anywhere else either. The short wires obviously are too short to connect to a Battery terminal & Lug in most configurations so you either have to put 2x 7AWG Terminals and then extend using a single 4AWG or use a Butt-Connector (eeks) to extend the wire. putting the 2x 7AWG into one side & 4AWG out the other.

I'll post IF they respond and what is said or if they do not respond which IMO may be an indicator for caution & rethink.
Steve
 
When I bought mine a couple of years ago I had good support from IC GOGOGO, they would talk to JK for me.
 
I looked at all the vendors/resellers I posted into the title, HankZor had the most complete information and links to the GitHub Repo.
As for ICGoGoGo I've already been totally suckered by them before (as have many others), never doing that again.
 
Steve_S said:
I looked at all the vendors/resellers I posted into the title, HankZor had the most complete information and links to the GitHub Repo.
As for ICGoGoGo I've already been totally suckered by them before (as have many others), never doing that again.
Click to expand...
What's up with them? I haven't bought BMS's for a while, but the last time I did everybody was using them.
 
Does anyone know what is exact type of connector used for RS-485? I already had RS-485 USB converter cable, so I did not order the original RS-485 cable, but I'm missing the BMS side connector and nothing I have does match
 
mihlit said:
Does anyone know what is exact type of connector used for RS-485? I already had RS-485 USB converter cable, so I did not order the original RS-485 cable, but I'm missing the BMS side connector and nothing I have does match
Click to expand...
You need a JST 1.25mm connector for that, like is available here
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Smarter Shopping, Better Living! Aliexpress.com
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In one of the videos in the Off-Grid Garage, Andy comments about the 7ga wires for the B- & C- battery connection being too small to carry the rated 200amp Anyone have any work-arounds for that issue?
 
There is no issue. He was corrected in the comments. Those are silicone wires. I can't find values for 7ga wire, but single 8ga can take 100Amps, so two 7ga wires should be enough for 200Amps. The only issue here is that their working temperature could be a bit higher, so if you screw that to a terminal that has plastic around, it could damage it.
 
I ordered the display for my 200amp JiKong BMS. Mine had no wires but has threaded tie downs. I plan to use a single 2ga built with flexible battery cable. Also note the threads are 6mm which is also what powersports battery terminal screws are so easy enough to find good screws.
 
Diesel Pro said:
I ordered the display for my 200amp JiKong BMS. Mine had no wires but has threaded tie downs. I plan to use a single 2ga built with flexible battery cable. Also note the threads are 6mm which is also what powersports battery terminal screws are so easy enough to find good screws.
Click to expand...

Make sure your BMS has the display interface. It's a rather new addition.
 
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