The JK-BMS 4S-8S Edition - World Premiere. The best BMS now for your 12V LiFePO4 battery system.

[@OffGridGarageAustralia]

That was a lot of fun this morning to chat with you during the premiere. We should do this more often. I can make longer videos so we have more time 😁 We had over 500 viewers during the stream, that is amazing! Don't forget, I'll explain exactly what happened with the JK-BMS in the very next video, coming on Saturday morning 5am AEST. Thanks a lot again for all your support. Love you all!

[@jakobgode]

Hi Andy glaubst du, dass Rohrkabelschuhe 50mm2 auf M6 auf alle 4 Anschlüsse vom BMS passen?

[@OffGridGarageAustralia]

@@jakobgode Hallo Jakob, hab gerade mal gemessen, die beiden Terminals sind jeweils 18mm breit, also 2x 18mm plus 1-2mm Platz noch dazwischen. Ich bekomme dort sogar zwei 70mm Kabelschuhe nebeneinander drauf.

[@jakobgode]

@@OffGridGarageAustralia Vielen Dank 👍🏻

[@andresnorrepassero2125]

Hello Andy. André from Norway here; Could I ute this BMS for my 3S build? -For my boat I will build four 12V Lithium ion 3S7P batteries. LEV50 Cells from EV Peugeot i-on 11,25V nom 8,25 - 12,3V range each of the four battery pack will have 350Ah and will be connected in parallell, totally 1400Ah

[@Bokul112]

@@OffGridGarageAustralia Hi sir Eve LF105ah brand new cell made by 12v pack need to Balance machine or jk bms is enough?

[@nigelcharles511]

I have just set up one of these JK BMS's. It was supplied without an on/off switch. From previous setups of a JK 48v BMS I know that you can apply a voltage across the P and B terminals to activate the BMS. In the past I had used a 9v PP3 battery to do this but I have just seen a KZbin video showing a very easy alternative. Set a multimeter to the diode test setting and touch the +VE lead to the B contact and the - ve lead to the P contact. The BMS then starts - quick and easy!

[@teardowndan5364]

If the inverter has an LC input filter without clamping diode, the BMS may have gotten zapped by the filter inductor exceeding one of the FETs' avalanche energy when the BMS disconnected.

[@GregOnSummit]

Had to look this one up: Coulomb counting is a reliable technique to predict remaining battery capacity. 👍

[@timjerby5080]

I will be building a 24v 280ah battery very soon, I was leaning towards the overkill solar bms till I watched this video, I will be going with a jk bms now, thanks for the very informative videos, keep up the great work, enjoy your videos!

[@msgtb]

Did you find out what JK is talking about not being able to hook this up in parallel? Thanks for your work Dave

[@jimmyponce1]

Andy, Ty for such wonderful work. I love the interactive live chat section! Keep up the good work!

[@OffGridGarageAustralia]

Thanks a lot for tunning in this morning. It was great, I really enjoyed it.

[@Bokul112]

@@OffGridGarageAustraliadear sir Daly bms or jk which one better please tell me

[@OffGridGarageAustralia]

@@Bokul112 JK, 100%!

[@Bokul112]

@@OffGridGarageAustralia thanks sir

[@Bokul112]

@@OffGridGarageAustralia sir 100% mean? Daly smart bms with active balancer is good ? For 12v 105ah

[@jasonc6250]

Thank you very much for your review. I just ordered one of these and they are on SALE right now. With your discount I only paid $109 USD. Thanks again.

[@OffGridGarageAustralia]

Thanks Jason, that is a really good price for a great product.

[@grahampearce6462]

Wow! I didn’t realise you could have so much fun testing a bms and learning.

[@dutchpot]

I'm not surprised that the cables stay cool. This is the formula for calculating the cable size: Current (Amps) x length (meter) x 0,2 = cable (mm²). So calculating back: 16mm/ 0,2m/0,2=400A. So the length has a huge impact on the capacity.

[@redmerbootsma9375]

Nice, just ordered one for my 4s setup for offgrid camping. Thanks Andy for the review !

[@hummmingbear]

Are you still planning to do a video where you review your Charge Controller settings? Would love to know your settings!

[@carlosgaspar74]

Serie/Parallel connection for communication/functions purposes between BMS and subsequent data to inverter/chargers. More than one RS terminal needed. That's my best guest. 😉

[@paulhowes3788]

Andy i must thankyou for these videos. Your info has been so helpful. Ive just completed building a 280ah 4 cell lifepo4 battery with the jkbms. This is to replace 2 lead acid batteries in our motorhome. I chose the jkbms to be able to connect to my rasberry pi running the cerbo gx, again thankyou to your videos for helping me get that working flawlessly. Next step is the peter inverter, and hopefully pick up on the rs485 to the raspberry pi. Keep up the great work on your channel.

[@OffGridGarageAustralia]

Thanks a lot for your kind feedback. I appreciate that. Also, as an alternative, have a look at these Xijia Inverters on my website. They are very robust and at least as good as the Peter.

[@paulhowes3788]

@@OffGridGarageAustralia unfortunately xijia isn't available to the UK

[@OffGridGarageAustralia]

@@paulhowes3788 Not from AliExpress through the links on my Homepage? They come with a universal plug which fits all standards. off-grid-garage.com/inverters/

[@centerrightproudamerican5727]

It is unfortunate that BMS could not handle shut-off for the 200+A test. That is a black mark on the BMS. Despite that, this seems like a solid BMS for 12V set-ups with 1500W (or smaller) inverters. (Note: I would never run a BMS at 100% of it's ratings. My designs would leave a minimum of 25% headroom.) JK has made itself the top BMS vendor in my book. I am not sure why anyone would pick a different BMS for a DIY battery. BTW: I avoid 12V systems if I can, but many folks like to stay with 12V for mobile installs. It would be nice to see a 300A 4S BMS that could drive full power on a 3000W inverter. (300A is a lot more current than I like to deal with....and that is one of the big reasons I avoid 12V.)

[@ed-ey1yb]

Agreed, I wouldn't expect it to run for very long at full rated load, but it still should have cut off gracefully. Very curious to see what actually burned up.

[@yv6eda]

Thanks for come back to us, the poor guys!

[@FutureSystem738]

Thanks Andy- awesome! LOVE your work! Mine is on the way, so the caravan will soon have an upgrade! Fabulous!

[@rondinifilho3484]

Outstanding vids Andy. So many thanks for your lessons. BMS Jk working perfect here in Brazil !!!

[@OffGridGarageAustralia]

Thank you. Great job 👍

[@photocromax]

@off-grid garage , Andy could you try to see if the button on the display is a simple contact. Doing a continuity check on the cable with the button released and pressed. If it's a simple contact it's detectable. The display is not very useful, but a DIY 1$ button could be very beginners friendly.

[@OffGridGarageAustralia]

I'll have a look.

[@krg038]

you live on the edge Andy. Good job.

[@shameelali2549]

Absolutely awesome vid,was excited the whole time.

[@dennis_m]

Hi Andy, I think those EVE LF105 are rated for only 1C continuous discharge. 3C rating is only for long pulse discharge, may be 3 minutes or something. Can't wait for the magic smoke trouble shooting video. 4S capability in JK is great. Thanks for the review.

[@OffGridGarageAustralia]

You're right. 3C is only for 30S. Still very good and maybe worth a test.

[@dennis_m]

@@OffGridGarageAustralia Yes very good test indeed. And ahh I missed the Premiere and the live Chat. dozed off for a while, it was 1AM here.

[@markdavidson6321]

I received mine today and super excited to get it hooked up. Mine didn't come with a display, but only a power button. Not a big deal for me, but just informational. Not sure why this was different other than Hankzor likes Andy better. I don't blame them for that. haha Thank you for doing all of these tests to provide us with data to make informed decisions!

[@reyanacito3044]

Hello Mark! I just received mine with power button also instead of a display. Just to make sure, is this power button will be plug on the display port to start the BMS? Thanks in advance.

[@markdavidson6321]

Yes, that’s correct. The plug will only fit one of the ports so you can’t go wrong

[@mikeunum]

That BMS looks amazing. Now we need a 48V version of it. It looks great. Now we must check the charging process.

[@Ahhhhnein]

They are Available up tp 24S :)

[@jeffreyabrown1972]

I love all you detailed videos thus far and I’m enjoying and learning at the same time.

[@OffGridGarageAustralia]

Awesome, thank you!

[@Allenw154]

27:51 is beautiful. 🤤That is very comforting to see it in action, no guesswork to know if its balancing or not.

[@teddypreston5525]

I guess we now have a new test... The Lick Test {Not to be confuse with the archaeological one}. Nice! Love it. Does this one requires a prior use of S.P.A.T. at the right temperature? Inquiring minds want to know!

[@OffGridGarageAustralia]

Hahaha, Teddy. I cannot waste any drop of this liquid! It was in the freezer for 1.5h before doing the test, so temp was OK with 3°C.

[@SiriusSolar]

"I could watch this all day long" Me to! it's hard to find a KZbin video that can capture my attention for 45 minutes!

[@OffGridGarageAustralia]

Thanks a lot Travis!

[@randycook4364]

OKAY I believe I;'m sold on this one. Perfect for a small 4s 120 amp battery to run my 12vdc driveways lights.

[@MrRickvanwinkle]

Great video Andy , I love watching your reviews and experiment , great stuff 😂

[@urbingwatched9752]

Thank you. Your videos are starting to give me the confidence I need to take on the next project. Currently most of my house is solar powered on a 48v system, now my sights are on my moth balled 1979 MGB limited edition. I'd like to take it electric for cruising about town. I have subscribed and will review all your postings!

[@dig1035]

So excited for 4S BMS, been waiting for these features without magic smoke!

[@raphle880]

Finally I found a nice youtube channel with good test. One of myDaly bms gave up...and so Im looking for something better for my 280 AmpH battery . Thanks for this test, an order will be done soon.

[@OffGridGarageAustralia]

Thank you Ralph and welcome to the channel.

[@antoniodecrisci2369]

Cool video, Andy. Looks like they use thermal pad/adehesive between the mosfets and metal case, hence the bending. This allows the heat to dissipate into the metal case and remove it from the mosfets. Has to be a tight contact for it to work effectively. EDIT: Passive Cooling.

[@SVAdAstra]

I suspect your assumption of a fried FET is correct, possibly caused by an inductive flyback affect when the load was removed, causing the FET junction voltage to be exceeded. If so, that's a definite fail for the BMS. It would almost certainly fail if the discharge FETs had to interrupt an overload current. "Not fit for service." I look forward to seeing your postmortem.

[@gumpster6]

Am I seeing smoke at 0:55 and again at 1:02? I have a feeling some electronics were harmed in the making of this video. Oh, this is going to be good.

[@jamesmason7124]

Lol

[@UsernamePassword85]

I put two on order LOL! Cant wait for the review!

[@jameshelmuth5268]

Me too...

[@t3chb0y67]

Why dont you build your own bms

[@UsernamePassword85]

@@t3chb0y67 I am not that smart

[@UsernamePassword85]

@@jameshelmuth5268 I didn't notice you cant run in parallel . This might be a problem.

[@martinwhite418]

​@@UsernamePassword85 What exactly is meant by "can't use them in parallel"?

[@bartowl]

I love the under temperature test!

[@gumpster6]

Well the teaser video had me excited to see what you blew up. Have to wait until the next video to find out all the details. Anyway, I enjoyed the testing and had a chuckle as you decided to keep pushing it after the magic smoke appeared. I was surprised the BMS was still functioning after all that. Things tend to not last very long when run at the maximum. Had you kept it just under 200A it might have been fine.

[@ArisMad]

I have this BMS almost a month now... testing daily and playing with very satisfactory results. The odd that observed is in total current of the battery, when the battery is charged and discharged simultaneously. Current sensor fail to display real number (zeros), can't calculate load and charge and report error with yellow text "Protection (Current sensor anomaly)". I dont know if my BMS is faulty or something wrong related to software or firmware. Fact is, if one of the currents missing works fine. In your test Andy notice you use only one scenario, either charge or discharge not both. Haven't confirm yet if that affect also some other counters too, cycles used Ah etc.

[@Deiphobuzz]

More than a year has passed, how would you rate this bms to work with the 204EVE cells and a load between 1kw and 2kw? 2kw pulsing, induction cookplate in a campervan?

[@patrickmendiuk1064]

Thanks for the making the video. Do you know what the quiescent current is for the BMS?

[@vu2dji]

Thanks for introducing to this very nice BMS Andy! Ordered this after getting inspired by your video. Had to get it to India from Hankzor through a friend in an intermediate country as aliexpress does not work here (Duh!) Awesome BMS!

[@qwe304]

I assume that the emergency switch is like the battle short on army generators, bypasses safety checks that would prevent the generator from running and causing damage. Sometimes you just need power. I assume this bypasses the temperature restrictions and settings

[@bluetrepidation]

I picked up two for my projects. Thanks.

[@OffGridGarageAustralia]

Great, you won't be disappointed.

[@jasondevine6014]

Looking forward to seeing what smoked... I reckon it was maybe a current shunt, but will be interested to see. Btw turning off a FET with full current is not a problem in itself to the FET. You may however produce a inductive spike that the circuit around it finds hard to handle.

[@michaelbouckley4455]

When the JK BMS is on, the display will turn off the backlight, if no current output from BMS is being detected , for 10 seconds. The default supply is with a switch, not the 2.3” ‘power board’ display. The Pro display uses display and RS485, more suited to the 24S

[@ascii892]

I was waiting for you to check the amp reading at 200A discharge after you calibrated it.

[@kswis]

I like that you have to option to change the resistance in the balance leads. If I had this bms on my 280 ah cells I would be more likely to use it but ehh. Wouldn't make a huge difference other than minut accuracy. Well don't video Andy. Thankyou for sharing as always

[@kajakmannen1666]

Thanks for the installation guide. Very usefull. I noticed my BMS app doesn't show any decimals for "calibrating curr." value, but maybe they have changed this in the app lately?

[@my1991FoxBody]

Love your vids....You are helping me understand the charging processes of LifePo4 batteries. I just purchased two SOK Brand 206 Ah "H" Series LifePo4 batteries to replace my older flooded deep cell batteries. I want to really understand how to charge and take care of my new purchase. Also I'm in the market for a new clamp meter and wondered how you like your UNI-T Clamp Meter? Also what model meter is it? I couldn't quite see the model in the video. Would you purchase that same model number again or would you get a different brand and/or model number? Thanks again for informative and humorous content!!! Mark

[@Trent28888]

That noise was a mosfet poppin,they are under rated by 25A each and if ya got a oscilloscope ya wanna put that on the dc power out of the bms and then other channel on the ac of ya inverter

[@MitchGrace]

Hi Andy, it looks like Hankzor is no longer honouring your coupon code :( I'm sure this video is still sending lots of customers their way however.... p.s. Thank you so much for all your work, it's such a privilege having a fellow off gridder making content here in the Australian context that is so informative

[@OffGridGarageAustralia]

Thanks a lot. The discount was only for a limited time, I believe. It may have expired.

[@janbroz4681]

Hi Andy, thanks for all your great videos. I have a question and perhaps maybe a potential test idea? I've read somewhere that the welded stud terminals are not really good for high current draw. You yourself had pointed out the small surface area of the welded studs in your videos. I had an Idea tonight, how about adding copper washers with 11mm ID and 16mm OD, 2mm thick(or 2x1mm) around the base of the welded stud where the original battery terminal is. This would increase the contact area with the busbar and allow for more (or less restricted) current flow resulting in less heat? I could be wrong of course. Also ot sure about mating different metals (copper/aluminium), so nickel plating might be beneficial? Let me know what you think.

[@OffGridGarageAustralia]

Thanks Jan. I have done some high amp testing here on the channel with these cells and the very small contact area of the welded studs (see video below). PERFECT! No trouble, no heat built-up. Seplos put copper washers in their DIY box to be installed around the terminals. Not a good idea. While it increase the surface area, it also increases the resistance and heat. kzbin.info/www/bejne/jIG0p6ZjZ76MsKM

[@johnnymunn]

I have been using the same BMS on my system since the end of last year with no problems

[@jackiedines5229]

How? These have only just become available?

[@mirorava3296]

I have too bought the same exact bms like 4 month ago, they were on the market for some time already

[@loucinci3922]

Well done. Please, do a video of opening up that JK to see what smoked. Is there a C or F option for reporting temps? If you have the bluetooth display, why would you need the other display? Bluetooth seems to provide a lot more information, right? Thanks for sharing

[@philippetouze4239]

hello on this bms there is also a heating pad output, for cold places (camper van), a video with this element would be interesting.

[@JoeInBendigo]

Looking forward to the explanation of the pop and smell.... :)

[@civicrocker]

I’m definitely getting one of these for my campers solar setup

[@hradmark]

Must say I am very impressed by your work, not only your installations etc but also with your ability to share your experiences and knowledge. Very helpful indeed. Now, would you put a fuse between BMS B- and and the cell? Or "just" go with the fuse after Battery pack (-), before shunt and then loads? I saw somewhere that you were asking about the connectors to the JK BMS. I figure you found out, but in case not - they seem to be Micro JST 1,25 (not confirmed - I have ordered (for an on-off momentary switch) and hope it works). Regards!

[@MuscatZulu]

Great test & review of the JK BMS Andy and I like many others have purchased one after watching your excellent video. I recently upgraded my inverter charger to 4.2 Kw from 2.5 Kw and now I’m getting this “Protection (CPUAUX Anomaly)” warning repeatedly as are many others with zero response from JK or their distributors to our complaints. Can anyone shed any light on what the cause might be and possible remedies? Cheers & Beers🍻

[@UsernamePassword85]

Hi Andy, Hey all! Just thought I shed some light on my experience of this bms. All is great till you run into an issue with it not turning on or off. When you do finally get it to start it will not connect to phone app. It so happens that one of the diodes for the speaker causes the unit to malfunction. I had this issue with two of the bms's I purchased. I was advised by the guys from JK to remove this diode. Once done problem is solved! Though this mod causes speaker to no longer function. I am not sure if this issue is still occurring with current stock they are selling. Also running multiple battery banks using the same bms is now possible providing you use a T Class rated fuse. Please refer to the Aliexpress listing for details. Was not accounting for this additional cost but as long as everything works all is good i guess? I hope this is helpful for other viewers looking at purchasing this for their application.

[@joebalciunas6962]

I received mine on Friday. The button turns it on and off, but it won't connect to my phone. The app version is 4.7.4.

[@UsernamePassword85]

@@joebalciunas6962 do you get three peeping noises from the speaker? or is it continues ? I am using 4.6.5

[@UsernamePassword85]

@@joebalciunas6962 Just to be clear I am using the android version of the software.

[@joebalciunas6962]

@@UsernamePassword85 I do get the three beeping noises! And then the light just blinks once a second. The Bluetooth symbol on the app always shows an x, like it is not turned on.

[@joebalciunas6962]

@@UsernamePassword85 so am I! The app opens, but the scan button has no activity,

[@stoptheirlies]

Hi Andy, again please look at the SILICON AWG chart, the awg7 is over 300 amps, Silicon cable has a much higher strand count

[@OffGridGarageAustralia]

Thank you. I'm just not sure if this is silicon cable. It looks like normal copper cable to me, not silicon fine stranded.

[@stoptheirlies]

@@OffGridGarageAustralia Hi Andy, I don't think I have ever seen Chinese electronics without silicon wire. I bought a 10,000/18,000kw Chinese inverter and when I looked inside and saw the cable to the output terminals, like you I said no way, then discovered the American AWG is completely different to the Silicon AWG. And you yourself commented that it was cold when you ran 200Amps in the test where you got magic smoke from the JK BMS, By the way, I am Qualified electronics engineer with 50 years experience, retired now 70 years old and although it's not good practice to leave it, I would leave the dead FET if you do not have a hot air re work station. Keep up the excellent video's, you are like everyone's best friend . Bob Uk

[@citizengkar7824]

It would be interesting to see what the EVE battery cells actual, present specs are. According to the Hankzor site, the battery cells should have no more variance than: volts = 0.05VDC Internal Resistance = 5 milliohms Capacity = 30milliamps Judging from the changes in the cell voltages (loose terminals aside) I would guess there is a larger delta, than the above measurements. Great video, though.

[@sandy1234853]

if the bms is rated for 200amps then it should be able to handle cutting off over 200+ amps in an over current scenario otherwise that's a major flaw in the design might be just a lemon unit but still these are there for safety it has to work perfectly

[@sjdtmv]

Be a nice setup with a finned heatsink instead of a flat aluminium plate for better heat dissipation or an ability to add a temp controlled fan, I have a new set of 16S 280ah batteries coming from Basen just arrived and has just gone through Australian customs so hopefully see them next week , as I am holding off on a BMS until I see something that stands out above the rest, this will power up a 11kw MMP inverter for off grid, but I am waiting on that also to be dispatched out of Taiwan.

[@johnturner9395]

Excellent video Andy, many thanks. I dont know if yourself or anyone else might know if there is an issue for having the software mod loaded onto GX touchscreen for batteries with integrated BMS and still wanting to use a Victron BMS ver2 with victron batteries. Not as the same time but using either a Victron lithium set or integrated BMS batteries?

[@headdown1]

Excellent video - thank you! Mine is on the way for my first battery build, also a 105 ah with Eve cells. Can anyone tell me if the question was ever resolved as to if this BMS can be used in parallel with other batteries?

[@jim.c6780]

Off-Grid Garage in my opinion all bms's should have screw terminals for the main wires would makes it so much easier to work with then soldering them 7 gauge wire.

[@russellribeiro1039]

Hi Andy, this is Russell here from Rio de Janeiro Brazil. Your fan. Do not miss any of your videos. They are instructive and nice to see. I have a question on this JK B2A8S-20P. I am using them to made 5 12VDC DIY Lifepo4 batteries. I want to know how can I get the BMS to send me a 12V signal in two cases. 1- When the BMS cuts the battery charge due to "Cell OVP" (cell Over Voltage Protection) and 2; when the BMS cuts the discharge of the battery due to "Cell UVP" (Cell Under Voltage Protection). Is it possible to get these signals in the one of the BMS connectors?

[@davidb.5544]

I sure hope they add those threaded connectors to all versions of the BMS and not just the 12V version. Would be happy if they made the cables optional if they did that so I don't have to pay for cables I won't use anyways.

[@OffGridGarageAustralia]

I will make this suggestion to them. The 16s version comes in a closed case though, so not sure if they would change that design. It is more important for the 12V and 24V systems due to higher currents in my opinion.

[@davidb.5544]

@@OffGridGarageAustralia The other advantage would be being able to use whatever length cable needed without having to splice another cable on.

[@ywatha]

Great Video, Thanks. I'm a little bit confused 25:10 . At the Initial state, Remaining capacity 77 AH get from..

[@eelcologo]

I have ordered the JK-BMS after seeing this video. I was just going to make the connections when I noticed the cable lugs (The Chinese type) had a bore of 8.5mm way to large for a 6mm screw. There is hardly any copper left. That might be the issue in warming up so high at that area. I wil fabricate a new cable with the european standard lugs that weights 8.5 gram instead of the Chinese ones that just comes at 4 grams of copper. I think the Chinese manufacturer could do better here. Happy with the bms thoug!

[@famlindqvist]

If you have time, check the built-in coulomb counter if it retains the counted SOC of the battery even after a period of time when not connected. I've found that the Overkill BMS built-in coulomb counter revert to the SOC given by the Voltage Mapping table after a while. Really disturbing since the Voltage mapping table does not represent SOC that accurately. So if this BMS built-in counter can handle this, it will save the purchase of a Victron smartshunt. For me, SOC is essential since I use my batteries on a boat with limited charging possibilities.

[@russellribeiro1039]

Fantastic Video. Very instrutive for me. Thanks

[@martink9785]

No idea why I waited so long to watch this, I am sorry. You just made me buy one of these and the same display. I've come to hate the xioxiang app and my existing BMS is only 30A anyway :P Cheers Andy!! :)

[@john_in_phoenix]

I have the 8S only version, I very much like not having the short power cables soldered. It means that you can make your own. It hasn't given me any problems, but I didn't purchase the display or heater option.

[@andrewcampbell5258]

How did you get it to turn on without the screen?

[@rickytapper9779]

If I look at this video in conjunction with the SunKit video. It appears that this BMS with its active balancing, would be better on the SunKit (assuming this balancer supports a parallel battery wiring implementation - can't wait for that vid). Do you think that would work?

[@Kinimodus]

Hi Andy, sorry I am a bit confused now. I really enjoyed your video and even the "explosion" did not bother me, BUT: the digital meremaid pointed out in one of her videos, that JK unfortunately is selling some JK 4s BMS under the same label, that do not run under a 4s configuration. Hope, you get my point. How can I make sure, that I order the right (4S suitable) BMS? Thanks for all your work! And "Prost" from Bavaria.

[@bryanspears2045]

it appears the 4s-8s doesn't come with the screen.. not sure.. still ordering it.. perfect fit for my growwatt 3000w 24v

[@excillisbank2611]

vraiment impressionnant ce test ! surtout que j'ai sursauté aussi quand le mofset a brulé 😃

[@alsemi-back-up579]

The 8s JKBMS I Ordered Did NOT Come With Cables or screws(Bolts) for the Cables to Attach ! I Asked Hanksol & They Said does Not Come with. NOW They Won't Even Respond to my messages! I Do NOT Think Much When You Pay Over %100 Canadian Dollars for Just to Receive ONLY The BMS! I Also will NEVER Deal With Them Again!! Just my 2 Cents!! congrats for You. Good Video.

[@stoptheirlies]

Andy, you don't have to connect a 9 volt battery to start it up, all you have to do is start charging to turn on the BMS, if the charger is more than 4 volts higher than the battery the BMS will turn on. Read the manual I downloaded from YOU. Bob UK

[@OffGridGarageAustralia]

Thanks Bob, I have shown this method in another video already. Sometimes you just don't have solar or a charger connected to your battery and then it's good to know how to jump start the BMS.

[@SylwerDragon]

I think I'm a bit disapointed.. I understand that BMS should handle 200Ano cont.. and maybe up to 300A ..but lets be honest..if transistorBMS will pop up close to 230A i think pcb needs some rework.adding some voltage protection/reverse voltage protection and clamping protection ..so it wouldn't destroy itself. I think this one is still missing from it I wanted to add that Emergency function is something like you have to switch it on no matter what..it is emergency so you need power even if your rules say No battery is dead ..or it is too cold or too warm..or such..Emergency option should allow you to discharge your battery more

[@OffGridGarageAustralia]

As I said, I will explain this in all details in the next video. Thanks for the explanation of the emergency switch. I thought it must have been something like this. Could be actually useful if you use conservative settings in your BMS.

[@spudunit]

Aloha Andy! I ordered a JK-B2A8S20P, intending to do an 8S setup with EVE 304Ah cells. However: we ran out of money. Question: can I configure these to use our old 12V 3KW inverter? What if I put 4 pairs of parallel cells in series? Thanks!

[@oneman29]

I was scheduled to watch the premier but KZbin wasn't working at 1am Bangladesh time!

[@OffGridGarageAustralia]

Oh, nooooooo! We will do it again. 1am was far too early anyway! 😴

[@silverleapers]

"I'm the bus bar terminal fix-ar", in Andy's best Arni-Aussie accent..."No wait, I'm the BMS Chef!" Magic 203Amp smoke! 👨‍🍳🍳

[@dino5002]

great videos thanks. I'm a little confused why you like this BMS so much when it blew up? Shouldn't the Over Current protection kicked in and safely disconnected the load without blowing the output? Its rated to disconnect up to 350A? This would seem like a fail? Also if the unit is getting hot at 200A should it have active cooling built in?

[@OffGridGarageAustralia]

Absolutely. This was the first device on the market and we have raised this issue with the manufacturer so they can choose different FETs in the future. It has passive cooling and 200A constant current is stretching it. 200 Chinese amps are like 150 real world amps 😊 It is still the best consumer grade BMS out there.

[@chamaldezilva]

Hi Andy, Can you explain about the on/off switch (from the LCD screen to the board) diagram of the BMS LCD port?

[@JaapdeWaalMalefijt]

Hi Andy, I have tested the JK-B2A8S20P for use in our AGV-batterypack. For us the SOC is very important to steer the agv in time to a dockingstation for loading. It is not clear which value I can use best for the SOC. Remain battery is what they present in the app but I ̀ m not sure if that is calculated by means of counting coulombs. It looks more like the value is calculated from the voltages. What is your idea about this?

[@OffGridGarageAustralia]

The JK-BMS does definitely Coulomb count and once fully charged it starts counting from there. The SOC value will drift over time if not fully charged frequently. If you charge it in a dock it should be fine and fairly precise, so you can read the SOC directly and use it for your system. The remaining capacity is just a calculation the BMS does and displays, from what you have set as maximum capacity.

[@flynmoose2227]

Have been eagerly awaiting this video as I really want this BMS for my motorhome DIY build. I've got room for eight 280 or 304 cells. My question is can I do a 2P4S battery with 8 cells and use this BMS. That would give me > 550ah at 12V. With the BMS able to deliver 200A, I can drive a Xantrax 2000W (3000w surge) inverter at full capacity. No problem running microwave and multiple AC loads. Might even be able to run the airconditioner for an hour or two (15K btu - 14a). And with 2P4S, at 200A I am only discharging the cells at 1/3C. Thoughts? Crazy?

[@bildad1234]

I think you would need a BMS for each 4s bank. Also at the start of video it says that this bms cannot parallel, which is odd.

[@davidb.5544]

Why not go to 24V? You'd reduce the amperage coming out of the battery by half which would be a lot more feasible for the loads you are talking about and you can put all the cells in series with single BMS as well.

[@barryelk8517]

@@davidb.5544 - :-) b/c I already have the inverter! And if I go 24V then I ALSO have to change out a lot on the rest of the house.

[@barryelk8517]

@@bildad1234 - if I understand 2P4S correctly it is 4 banks of 2 cells. The banks are 2 cells in paralll (3.5V but twice the capacity). 4 banks in series. (14V at the capacity of the 2 cell bank). The BMS would be managing each 2 cell "bank" as if it was a single cell. At high C (charge or discharge) you COULD have cell voltage differences if the internal resistance isn't matched. At rest - cells in parallel will stay at the same voltage because... they are in paralllel.

[@bildad1234]

@@barryelk8517 of course, for some reason I had imagined 2*4s batteries paralleled

[@lexicase8805]

A little discovery i made a few weeks ago when playing around with my 16s jk bms, the chinese on the jk bms app and cloud logo literally translates to "very empty bms" and jikong translates to "disease control" . I do wonder if they meant to say something battery related, or if the translator is slightly incorrect but its kind of amusing nonetheless 😅

[@OffGridGarageAustralia]

Wow, great discovery!

[@sebastianlipp7649]

Hi Andy, I like your videos but what is a bit frustrating when researching what to buy, you never list the exact model number anywhere obvious. Good to know that this is a JK 42-8s BMS but which version? How many Amps can it handle? You say it in the video at 4:30min but you never know if you have the right video from the start. Would be great if you could list the exact product code in the video description as this would be immensly helpful. Thanks in advance!

[@chrisroyle4813]

Great episode. Does the 4.3" LCD offer the same functionality, other than having a larger screen with more information ? The 2.3" screen looks too "cartoony".

[@yuriykot10]

Good afternoon! I purchased BMS JK-B2A8S20P at TAO BAO. Unfortunately, the seller did not include a user manual. Can you recommend how to activate BMS? There is a short cable with two wires and a connector that fits into the display port.

[@lexicase8805]

Wow. Record speed shipping, i ordered mine on the 9th may, and its in my hot little hands on the evening of the 20th! I ordered the non heating version, but they sent the heated version anyway, maybe they just make the bms all the same, but just include the wires and plug with the heated version as the port appears to be there on the bms anyway. Since i have it now i might as well connect it right? It would be helpful if they showed a diagram as theres a ring terminal with a few green wires as well as one red and one black wire and they are so small!

[@ShaydTheDragon]

Did the JK BMS comes with cables? They don't say what kind of cable goes to the BMS 4AWG or 6AWG

[@veeerzes]

Hi Any, I know this is an older video but I hope you can still see my comment and reply. I want to build a 12V battery with this BMS, but I want to build a very large one, with 8 cells of 280A in a 4S2P configuration. But I don't want to build 2 separate 4S batteries, how do I connect the BMS to all 8 cells without it thinking it is a 24V system? Thanks!

[@jerry232366]

Hi Andy, Thanks for another awesome video! Love the content on this channel. Do you happen to have a link to the 1A version of this BMS, I cant seem to find it anywhere. It may not be available yet but just thought I'd ask.

[@keeptrying7640]

Yahoo love the info funny stuff well done JK I have to get one cause I have no BMS right now thank you Sir

[@crustytutsy5354]

Hi Andy, did u eventually contact the Hankzor about the serial/parallel question ? I have the same BMS and Hankzor never replyed to me so far. Thanks Chris