JK BMS 4s/8s (B2A8S20P) - Basic Setup

Learn how to build your own LiFePO4 battery here: geni.us/DIY-LiFePO4
Support our channel by shopping our web store for lithium batteries: geni.us/OffgridShop
Subscribe for FREE LiFePO4 battery tips & exclusive offers: geni.us/offgrid-email
--------------------------------------------------------------------------------------------------------------------
Welcome to our channel! We’re excited to get into this with you guys and share some of our journey and knowledge of custom Offgrid Power Solutions.
In this video we're going to be going through the set up of the JK BMS. There are some things that aren't that easy to figure out, so hopefully this video will help you. We'll take you through how to install the JK BMS on your LiFePO4 battery cells, where to plug things in and how to set up the app. JK BMS is one of the best BMS you can get, so good luck with your set up and hopefully you get it all set up OK!
If you’re building an electrical system and need help, get in touch: geni.us/offgrid-contact
If you're not sure where to start with your Offgrid Power set-up, book a consult call with us: geni.us/offgrid-consult
--------------------------------------------------------------------------------------------------------------------
►▷ SUBSCRIBE TO OUR KZbin CHANNEL: geni.us/offgrid
►▷WATCH OUR LAST VIDEO: geni.us/offgrid-latest
►▷ SUBSCRIBE TO OUR EMAIL LIST: geni.us/offgrid-email
►▷ BUY OUR MERCH: geni.us/offgrid-merch
- FOLLOW US ON SOCIALS -
Instagram: / offgrid_power
TikTok: vm.tiktok.com/ZMejrWUS8/
Facebook: geni.us/offgrid-fb
- CONNECT WITH NIGEL -
Instagram: / nigelivy
Twitter: / nigelivy
Facebook: / nigelivyphoto
TikTok: vm.tiktok.com/JRBJWry/
Snapchat: / nigelivy
Wantfeed: wantfeed.com/user/nigelivy/wants
- CONNECT WITH ROGER -
Instagram: / roger_ivy
- GEAR -
Main Camera: geni.us/NigelsFavCam
Most Used Lens: geni.us/NigelsGenLens
Favourite Portrait Lens: geni.us/NigelsFavLens
Other Favourite Lens: geni.us/NigelsOtherLens
Favourite BIG Lens: geni.us/NigelsLongLens
Widest Lens: geni.us/NigelsWideLens
Drone: geni.us/NigelsFavDrone
Gimbal: geni.us/NigelsFavGimbal
Mic: geni.us/NigelsFavMic
Lav Mic: geni.us/NigelsFavLav
Favourite Little Camera: geni.us/NigelsVlogCam
Tripod Thing: geni.us/NigelsTripodThing
SSD Lifesaver: geni.us/NigelsFavSSD
Favourite Mini Audio Recorder: geni.us/NigelsFavAudio
BIG Audio Recorder: geni.us/NigelsMainAudio
Favourite Camera Bag: geni.us/NigelsIOtherCamBag
Second Favourite Camera Bag: geni.us/NigelsFavCamBag
Favourite Camera Strap: geni.us/NigelsFavCamStrap
Favourite Tripod: geni.us/NigelsFavTripod
ND Filter: geni.us/NigelsFavND
360 Camera: geni.us/NigelsFav360
SD Cards: geni.us/NigelsFavSD
** Some of the links on this page contain affiliate links that generate a small commission for us if you click them.
- MUSIC -
Musicbed SyncID: MB011BXCC8XSWVC
All music used in this video is licensed from Musicbed.com.
If you’d like to get a free month of Musicbed, use this link to sign up: www.musicbed.com/invite/vF4lN
#offgridpower #vanlife #solarpower

[@andysutils]

Small tip. You can press down with a small point of a screwdriver and pull the unused balance cables out. If you ever do need them in the future. They just snap back in

[@offgrid_power]

Thanks for the tip! That's handy to know! :)

[@allynonderdonk7577]

Love this one Andy saved me a tear down. I built an 8 cell pack and used all the balance leads. 2p4s apparently it refuses to use half the balance leads for a 12v battery and just give an alarm.

[@lexicase8805]

Better to put the smartshunt between battery and bms so that you dont have error in the usage of the bms itself. Also if the bms shuts off youll still have the data from the smartshunt to find out why it shut down. I found the bms uses a continuous 2-3 watts, that if the shunt is after it and you use the battery in such a way that it doesnt reach 100% very often, youll have a capacity error. 3w doesnt sound like much but it works out to roughly 5.5 ah every 24hrs, that wont be accounted for by the smartshunt if the shunt is after the bms.

[@Bokul112]

@@offgrid_powerfriend jk bms is good or Daly ?

[@NounXXX]

​@@offgrid_power 📌 *Есть мысли, чтобы при отключении городского 220в, автоматически включалась JK BMS* ❓🤔 В Щитке стоит АВР

[@faceuptoclimatekarma]

Great tutorial, followed your advice and everything went smoothly. Thank you.

[@andysutils]

Roger and Nigel were a wealth of help solving my issue when I bought one of these from them. I suspect this is because i set mine on 🔥. Yes i admit it. I cannot believe how stupid i was after installing and configuring multiple lithium batteries and bms devices. I think it was probably the utter desperation of previously purchasing a jk bms but the supplier failed to tell me i was just doing one thing wrong. I would recommend buying from these guys. Just based on their support is fantastic.

[@offgrid_power]

Glad we were able to help and that you got everything set up in the end! :)

[@arr84]

Thanks for uploading this - very useful to get my BMS working! :)

[@nikowingchun1351]

Very useful! Thank you!

[@EmilyAndClark]

Excellent job Ill be doing a BMS swap video soon. Ill include a link to this as you do a wonderful job

[@RafalGalinski_drony]

Thank you for a great guide. Greats from Poland👍

[@babuufortwo504]

Thank you very much, Fred 👍

[@jacobreufstra4394]

Thanks a lot , very helpful ☺️!

[@offgrid_power]

Glad it was helpful!

[@lexcousins380]

One thing to watch is that if you have a 100ah pack setting the charge to 100a will give you 1c. Eve cells prefer 0.5c for long life. So set to 50a.

[@offgrid_power]

Good point, thanks!

[@blacklablover2982]

Very interesting and helpful. Thank you. Off to view the detailed video in a little while😁😁

[@offgrid_power]

Glad it was helpful!

[@matthewknight5641]

I have ordered 2 of the jkbms for my 16 lifepo4 in a 24 volt configuration. Basically 2 seperate batteries. Hopefully i can get them installed and running with the help of your videos. Thanks

[@Teknopottu]

Hi. How did your setup go? I have something similar in mind and any tips are precious 😊

[@matthewknight5641]

@@Teknopottu I ended up using my daly 300 amp bms and my jk is setting on the shelf. The daly is a 24 volt bms and the jk although much nicer is not big enough for running my inverters. I'd like to have another jk and have 2 seperate batteries but for now it 16 cells in a 2p8s configuration. I'm actually wanting another 16 of the 280 eve cells. I kinda need 30 kw of storage. I'm getting by with 560 ah at 24 volts but those rainy winter days are coming soon and I'd say I'll need more battery than what I have

[@lawrencecraig]

Great video, thanks. Does the BMS require 2 x cables or will 1 x at thicker gauge suffice?

[@user-ux2vd6xl6z]

Thank you so much !

[@blogdoriomCamicleta]

Obrigado pela disposição em ajudar. Assisti várias vezes seus vídeos e já montei minha bateria de 230 A.

[@louisbellanca9293]

Thanks a lot - I could not find any documentation on what the switch was for or how it worked. One question - I wanted to time when the battery can charge and I do not think the app has a timer feature. This is so I can charge at OFF peak rates at night. I was thinking about using the temp probe and adding a parallel resistor to create a fake Overtemp issue at until the right time. Do you think this will work? It would be nice if the app had a scheduler feature.

[@bonnetalexandre2085]

Hello thank you for your video! Does it need a cable to communicate with the hybrid inverter ? alex.

[@tiredofeverythingnew]

Fantastic video - Baie Dankie 🙂

[@offgrid_power]

Glad it was helpful! :)

[@gianlucapierini7883]

Grazie un tutorial molto utile e dettagliato. Un saluto da Roma

[@dominIKhs]

Hi there, is there a big diference when the positive wire is shorter than the negative? With the bms negative ends up longer some inches, any point rolling extra positive wire just to keep same lengths?

[@georgepilch8396]

Good video, now can you show the connections between the +ve and -ve terminals of the BMS to the Solar array and the MPPT controller and a 12v to 230Vac inverter, where should the fuses go and what rating should they be and also any isolators that may be required. Unless of course you have already done this. Many thanks.

[@NikolaySemenkov]

Great BMS! About Calibration Current in setting. If set here lower current than measured, will bms allow to exceed 200 Amps.. and to what extent.

[@domi4296]

Hello, what does the red light flashing near the temperature sensors socket mean during bluetooth connection? After 11 seconds the JK BMS JK B1A8S20P turns off. I can't get into the setting. Thank you for your help.

[@OmgSaySomething]

Balancing doesn't "transfer current from one cell to another" it drains the higher voltage cells with some current until their voltage equals to the lower (actually lowest) voltage cell(s).

[@NikolaySemenkov]

Cell wire resistance in settings seems a balance wire resistance as its values would be too high for the wires between cells.

[@lee1983us]

Question: when everything is wired up and I probe the main battery positive and the P - of the BMS, I get 12v when the BMS is OFF. In the video he’s getting 0v when BMS is off. Is something wrong with my BMS?

[@andrepallotta8633]

Hello wonderfull video. I bought the same bms i d like to connect with a computer with rs485 and can. Did you do ? could do a video about rs485 connexion ? Thanks.

[@msach4277]

Thank you for this! Other default password is 1234 as of 04/2023 at least to start, but settings is 123456 as stated

[@offgrid_power]

Glad you enjoyed the video!

[@alexanderkrupnov4999]

Good job! Everything is detailed and consistent. I think you know what you are talking about. Could you tell me a little more about the temperature sensors. There are two temperature sensors of this BMS. If it was necessary to measure the temperature of the environment or the battery, then one would be enough. There are two of them. What are they for? Where would it be correct to install them? Unfortunately, the manual does not say anything about this. Thanks in advance for your reply!

[@remnl]

did you ever found out about the right location of the two sensors? i guess on top and bottom of the cell pack?

[@alexanderkrupnov4999]

@@remnl, Thanks for your reply! There is no information about this in the instructions. But I saw one promotional video that shows the process of assembling and testing such cells. In this video, a worker assembles cells into a battery, installs such a BMS module, fixes one of the sensors directly on the contact plate going to the "+" one of the cells in the center of the battery, and leaves the second one hanging in the air nearby. That is, one sensor measures the temperature of the cell, and the second measures the temperature of the ambient air. Maybe so?

[@kirky1298]

Hi Mate, great video, I have a Renogy 170ah battery that's misbehaving and would like to install a JK smart BMS. The batteries continuous discharge rate is 125 amps. Would I be better setting this in the new BMS or would it be ok to leave at 200a . The reason I ask is that I am hoping to run this in parallel with my current 300ah smart battery that has a JK smart BMS as standard and a continuous discharge rate of 200a. The plan is to hopefully increase my capacity to 470ah. Any help would be greatly appreciated. Greetings from Scotland. 👍

[@huihup]

How many amp cold you draw from it before it burns ? Mine said 60a max ! My controler goes up to 75 peak! Is it ok like that? I know it’s a good bms and don’t want to ruin it

[@andand4964]

Can the Bluetooth be disabled in these units? Trying to minimised radiation around my small space.

[@cyanwaters]

Thanks for heads up on P- connection. GREAT TIP. Quick note though: at 18:58 "the BMS does not take into account the Peukert Effect" ... that only applies to lead acid and not lithium. Technically speaking there is one, but it's so small that it's immaterial.

[@clarkbeek]

Thank you so much! The documentation is a bit lacking, and definitely would have caused me confusion and grief.

[@christianwinkelmann8477]

I changed start balancing at 3.4 v .

[@PatrykRElektronika]

Just FYI the voltage drop on the shunt resistor is exactly 0.00V. There’s no current flow. The higher the current, the higher the voltage drop, that’s how you calculate the current flowing through it using the Ohms law 😉

[@oldcountry3474]

I have created a 24v battery by using a total of 16 Headway 38120 cells 8AH each. I paralled 2 cells per string for a total of 8 strings. Then series each group of two together. When setting the capacity in the app. Would I set it at 8AH or the combined 16AH from the parallel configuration?

[@user-nu6tk5mm9j]

16

[@johnwinchester7472]

i have a similar setup im building but 24v, the App wont work on my samsung phone, my jk bms didont come with a switch, it currently only outputs 12.6v out of the bms but 29v from the bat, but my 9th wire is cut and im commenting after watching so ill go fix the 9th with and see if it helps

[@offgrid_power]

Hope that adding that ninth wire fixed it!

[@fotoamgamgfoto3695]

Hi! Is there a way how the BMS could measure the real capacity of the battery? I used deep discharged 18650 cells, stored at zero voltage. All the thousand cells came back to 3.6V than made them paralel and built big 7S120P pack and put a JK BMS on it. Not sure how many Ah left in the cells, would be nice if BMS could measure. Rated is 2.75Ah each cell so I guess 2Ah per cell left in best case but not sure.

[@offgrid_power]

The JK BMS & Victron Smart Shut both do this.

[@fotoamgamgfoto3695]

@@offgrid_power and how todo that? What voltage levels to pass as low and max to be calculated? I use safe margins and BMS still does not calulate capacity only cycle capacity.

[@Cre8ionz.]

Question 🙋🏻 P- is for Power minus out and also for charge minus in ?!

[@user-qu5hd6fg8y]

As far as I know, the answer is "Yes!" for this model of BMS. But there are other models, and they may have different ports for charging and discharging. So, you can see phrases "common port" or "separate port" in manuals and datasheets.

[@pr5991]

when I charge my 24V 8S EVE 304 cells using JK BMS using EPEVER 30A Solar charger there is no problem but when I use PowMr 3000 watts inverter charger even at 10A then BMS gives Protection CPU AUX anomaly error message and get disconnected. Can anyone help?

[@tr-eg4uy]

hi, does this one start up in 4s mode with 12v?

[@offgrid_power]

It can do 4s or 8s.

[@christianwinkelmann8477]

No in 8s

[@leocostantino3184]

Great video Andy. Can you or any of your followers tell me what I need to do to deal with a forgotten bluetooth password? I can't change it without knowing the old one and I need to install the app on another device. I'm beyond fed up with JK support, the support page has been down for months and so is the contact page. Hankzor has been totally unresponsive to all my inquires and I've received no response from the JK info email address. My understanding is that there is a temporary code that needs to be entered but without support I can't get that code. I can't believe there isn't a hardware solution for a hard reset. Surely I'm not the only pea brain that has forgotten a password. I'm desperate for a contact who can help me.

[@kirky1298]

So, just to confirm, balance lead 1 will show 3v , lead 2 = 6v , lead 3 = 9v and lead 4 = 12v ? Or should they all show 3v

[@Michael-he2pw]

No , they should go up in 3v increments

[@paulsmith4856]

Hi is there any way of setting the soc

[@LancashireProClean]

NO the BMS works out the soc and I know when you first start using its way out but it will improve after its done a few cycles. Nice to see these have moved on to the JK it is a much better BMS and no need to top balance any more, the balancer will do it for you

[@frodev728]

@@LancashireProClean I would still do an initial top balance. Cells can arrive at a variety of states of charge (even if the resting voltage is the same) which could be many tens of AH different. Even a 2a balance current would struggle to sort them out initially, especially with solar charging and winter charge patterns…

[@LancashireProClean]

@@frodev728 Yes sorry I didn't explain properly I ment I don't link all the cells and charge to 3.65, I build the battery set up the BMS hook up to a bench power supply at 14.6v and leave it for a few days, when I come back the cells at 3.65 fully absorbed and the delta is down to or very close to 0mv

[@offgrid_power]

No, you cant set it as far as I know.

[@andysutils]

@@LancashireProClean can you leave your cells fully charged for that amount of time like a couple of days to do top balancing?

[@wowyummyyy]

L I K E 👍 👍 👍👍👍💯💯💯💯💯🤩🤩🤩🤩🤩🤩

[@offgrid_power]

:)