JK-BMS: all settings and menus explained. How to program and set parameters.
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- Опубліковано 27 вер 2024
- In this very detailed video, I explain all the settings and menu options of the JK-BMS. If you're new to the JK-BMS or just want to understand BMS settings in general, this is the video for you. I also give a lot of context and explanations about why I have chosen these settings and why they make sense.
If I forget anything or you want to add some more information, please leave your comments down below. Thank you.
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I tend to catch up on your video's at night. My wife says your voice is very soothing, and she drifts off to sleep. She has no knowledge of anything battery related (not has learnt anything since hearing you) but is sleeping very well 😅
Thanks Andy.
I really appreciate all the time you put in making these videos. I learned allot from your videos so far.
I want to echo what someone here said, "As always, you are meticulous and thorough with everything you produce in you videos."
Thanks a lot, Philip. I appreciate your kind words and support. Thank you!
I switched to the jk bms from the daly, best decision ever.
It's the product a lot of us waited for: BMS, active balancer and a heating pad control in just 1 product.
I have the same product (with heating pad control) coming in the mail. Do you have any heating pad/element recommendations?
I think it's the best integrated BMS on the market. The easy setup and active balancer makes it outstanding.
My 4s-8s BMS has the heating option too but I don't have the connector to test it out. It's only 3A, I believe...
The video is pretty long but is very informative so was worth watching every minute of it. Thank you!
Thanks! It was very useful. Constructing a power bank to survive next winter with the powersupply for several hours a day here in Ukraine.
As most people have already said I thank you greatly for all the time and energy you've devoted to these video's. I just picked up the jkbms to replace two daly's that I've started to run into balancing issues with. These video's saved me so much time determining which bms to use as a replacement and with installation/setup. I truly wish I could afford to send you a super thanks at this time but some day when I can spare a few bucks I'll send them over for you to buy another cold one!!!
I used JK-bms for my e-bike battery build after watching this video. thank you . great job
Thanks for this great explanation.
Just finished my ESS this evening.
Installed mine today with a Victron mppt 75/15, 100ah lifepo4 and a 100w solar panel for camping. Perfect and thanks for the detailed reviews and setup guide.
Hi, for me as a German your English is very clear and good to understand! Thanks for all your testing, it helps me very good to understand the Technics overall. Now I will look your Victron Smart Shunt Video ;-)
Thanks, Uwe.
Hi Andy,
in my opinion the Con.Wire Res. ist the resistance of your cell wiring. The BMS is able to calculate the "real" voltage of the battery because there is a voltage drop that becomes more important on higher currents e.g. 50A and higher. The voltage drop may be some mV but it is important, because the polarity will change while charging or discharging. so it must be added or subtracted from the cell voltage!
greetings from Germany!!
The cell wiring (bus bars) is in the order of 1 mOhm. It is probably even less than the internal resistance of the cell, which is around 0.25 mOhm. The Con Wire Res values on the screen look like around 150 mOhm, so they can't be the bus bars, they must be the balancing wires.
Thank you. As an inexperienced user, I could not immediately figure out all the parameters. Now everything is clear. However, I had to learn English for this.
Great video Andy, I have been waiting for it from long time. In just a month (August) finally I will install the first 304Ah batteries and JK, so I will copy your settings in mine. Thank you !
I just receive 2 JK BMS, yesterday.
There was a Power switch on this model, so I believe that the time where we had to jumpstart the BMS with a battery voltage.
Thanks for the video, now I don't have to use a lot of time to examine all the settings 👍
Mine had a switch power button too. Good idea.
Yes, all new JKs are having a display with power button.
Honestly I have jump started mine exactly once since I installed in the battery shelf. It will never disconnect unless I take the battery apart.
Another great video. Completed my battery about 6 months ago and wanted a JK BMS but at that time they didn't have one for 4s. I went with the Overkill (JBD) and so far it is working well and the cells are staying well balanced so far.
Someday I might need that increased balance amperage but, fortunately, right now everything is running smoothly.
I am going to try the JK BMS on my next battery.
Thanks for what you do.
Thanks John, the JBD is certainly a good BMS and I would use them as well. The Overkill I have (rebranded JBD) works well without problems.
@@OffGridGarageAustralia Hi Andy! Which one do you prefer for a 4S battery pack, the JBD or the JK BMS??
Congrats for all your videos and your channel. Amanzing work!
Thanks for this video. I couldve guessed the functions of 80% of these parameters, but it's very valuable to know exactly what I have control over, as well as within what range they should be set to. I find it very interesting that the balance trigger voltage on mine was set to 3.0V by default. That's 10%!
THANK YOU! Just what I needed. A detailed, methodical, non-rushed explanation of the settings. Legend. 👍
Thanks a lot, hence a 40min video. It takes that time 😁
vielen Dank für die Videos, die für den deutschsprachigen Bürger sehr gut verständlich sind!
Oh I jumped straight into tech head and neglected to say...thanks Andy for your excellent work... Cheers 🍻
Thank you!
Andy, congratulations on exceeding 34,000 subs! I think word is getting out about your channel. Good news travels fast! All the best!
Oh, yes, damn, I missed this again. Thanks a a lot!
Thanks Andy I’m still catching up on all the videos. I think the German accent added with Aussie slang is great. Actually laughed out loud this morning from another video when you said “it sh1t itself”. Keep up the great work.
Thank you (again) for your perfect explaination!!!
Thank you for the great explanation . Your videos helped me a lot to setup my own off-grid system !!
Thanks for your feedback!
Thanks Andy! And perhaps it's not just the accent, but more the movie set.
Thanks Jack. I try to mix things up a bit. As you can tell, I'm not a tripod fan 😂
@@OffGridGarageAustralia And all for the better...
Thanks for your vids, I've ordered new JK BMS 300A from ali express for 80 pounds. I'll use it with my 620AH 12v bank I am going to build for my camper.
That’s so true. I like the accent and the rumble off “fully discharged and fully charged, really good results and…hmm the “further to due”!. Makes me wake up in the morning and gets me sleeping at night. But I will say that for me personally the most important aspect is Andy’s educational performance. :)
Thanks a lot, appreciate your feedback and kind words!
Helpful and thorough information, as always. Thanks Andy!
My pleasure!
Nice and informative video. Thank you very much.
Connection wire resistance may be important when the balance happens. Balance current goes through those small wires and there will be a voltage drop when ~2 amps goes through them. And if we set up a correct resistance of them, then BMS can calulate the individual battery voltage by adding them to the messuring voltage of a cell.
Thanks for the lesson Andy, will help when my JK arrives. Cheers
Can confirm the short circuit protection works well in the jk bms, my inverter blew a mosfet while i was at work thankfully the bms was there to disconnect.
Brilliant video, could not find a manual and you explained everything
Hi Andi,
i think SHORT Circuit is at 350 A (max Amps the BMS can handle)
..in the datasheet is written 200A Continuouse and 350A max
Yes, it is
Would make sense. Thanks. I shall try, ey? 😁
@@OffGridGarageAustralia yes. Please.... Maybe not... 😁👍
That would make sense.
I cut the sense wires to different lengths, to neaten up the mess on top of my battery and of course it does show differentiated resistance values on the status tab. There was a bit of a debate on the forum regarding the wisdom of cutting the sense wires of BMS's, however it seems to be functioning perfectly. (WHEW! this first time builder thought id made a mistake...) However, the question of the settable resistance values on the settings tab is one i'd sure like to have answered... thanks Andy!
Thanks Kelly, perfectly fine to shorten or extend the balance cables. There is no downside to that. The BMS is either measuring cell voltage or balancing but never at the same time, so cable length is not an issue.
@@OffGridGarageAustralia So, just to be clear, i cut the sense cables to various lengths. Individual wires are NOT equal lengths. Conversation on the forum regarding the wisdom of doing that revolved around other brand BMS's and group thought it a no no... Andy, your work has helped me tremendously and i thank you.
First of all, your videos are amazing Andy! SO SO helpful that you test all these BMS's so we don't have to! And you explain so much. So many of the tricks and traps around battery charging and balancing. Great stuff, thank you!
I'm getting confused though. You have a video demonstrating how active balancing can actually unbalance your cells because it is always on. Then we have the JBD Muller Edition BMS which turns off its active balancer when it's not needed, supplanting the JK BMS at the top of the BMS pile. Problem solved. Now I see this video for the JK BMS settings, which let you set the balance start voltage to 3.45v.... why is the turn off feature on the Muller BMS any different from this ability on the JK?
Does this mean the main difference between the muller BMS and this one is just the maximum discharge current (250 vs 200(ish)) and the active balancing current (5A vs 2A)?? Many thanks from the UK!
I was surprised to see, that my Manuf. Date showed 2022-07-08. It looks like the BMS saves the date of first operation! ;)
Go enjoy that beer Mr.Andy thank you for this tutorial.
Thanks, will do!
Hi Andy,
many many thanks for the really detailed info about these settings.!
will use them when setting up my JK 16S System roughly the next month.
Best Regards, Jörg from nearby cologne, Germany
Thanks Andy, great video. JK BMS coming in the mail in a month or two.
Thanks Andy, this is very informational. Good stuff.
Can confirm. I probably would not watch this content if someone else hosted this video
Hi Andy. I've been watching your videos. Lots of info and learned how to assemble my own 280ah 16s lifepo4 battery. I'm having some issues with my JK smart bms. I bought an inexpensive dc charger from Amazon, but I didn't have much luck. So I assembled the battery and wired in the bms. I attached my Lithium battery charger to get a top balance. It won't charge past 3.34v/cell the AH rating sits at 198ah. The voltage is 53.56, which is 97% charged.
Great video, it helps me a lot to tune my JK BMS
Great it helps. Thanks.
An example of how good this BMS really is. I installed 32 EVE 280 cells with no top balancing, hoping the JK BMS with active balancing would do it. The cells varied from 3.1 to 3.4 VDC. Three days later, the difference is 7 MV. Great product Andy, thanks for the recommendation.
Thanks for sharing. That's what I do as well, I don't bother putting all batteries in parallel any more, I just let the BMS handle it.
@@OffGridGarageAustralia true true I got my batteries around 10pm I just parreled it till 10 am and connected it to the BMS and a day later it's in balance with .2mv diff
I made the same experience.
I'm trying to find for 32 cells and I can't find it, please a link where you bought it I will be grateful thank you.
@@christosxenopanagos2737Most likly 16s 2p configuration
I figured out what the cell wire resistance is. It's the resistance placed on the wires so the bms can remember the cells out of balance difference. When you have cells of un equal WH duringg initial top balance those values get tuned so next time you charge up you don't get cell run away..
You are TOP GUN BMS teacher for DUMMIES...me😅 can't thank you enough!!!
Thanks for your feedback!
Formidable vidéo explicative ! merci ANDY pour cette experience de configuration du JK-BMS.👍
Vieles war mir klar aber alles wusste ich auch nicht. Danke für deine Erklärungen !
Brilliant walkthrough settings! Thank you Andy!
Thanks for reminding us changing BMS password!
I am French and I think you have an accent too. But strangely an accent that makes English easier to understand for me. All people speaking English should speak with this accent lol.
Hahaha, great. Merci beaucoup!
Like always! Great video! Thank you for that!
A remark to the calibration of the current value. In the beginning I had the same issue. But the reason for that was the load I used... An inverter... And this pulls not a constant current from the battery. The current has high high ripple with twice the grid frequency. At the end I used a large pure DC load with high current and repeat the calibration. Than it works perfectly and I get a good accuracy for the current measurement.
Another point I did not understand is the over current protection of the BMS: I can understand that if I draw only a little bit over the defined limit the time until the BMS switches of takes for example 30s (when set to this value). But what happens if I draw for example twice the defined over current limit? Takes it the same time for switching off? This could be dangerous. What is needed here is a fuse characteristic: The higher the over current is the shorter the switch off time should be. Maybe anybody knows something about this? Or this would be an interesting test for Andy 😉?
But again, thanks for your interesting videos!
Thanks Andi, that is absolutely correct and the ripple effect can be the cause for the calibration issue of the JK-BMS. Usually you just don't have any other loads you could connect to a 48V battery.
The second point of your question is what I was asking for in my video as well. In case of a short for example, how does the JK determine that? In other BMS's (the QUCC or JBD), I can define a current threshold for a 'short' and a reaction time for the BMS to shut off.
Totally agree with you here, that is a very missing setting in the BMS. I'll take this back to Hankzor and see what they say...
Good points Andi, and Andy did refer to this “What is a short circuit current” issue with the JK, it needs to be addressed.
You are so cute :-) , and for me as a German, your english is very good to understand! Nice video.
My eve280s come today. Plan to set them up just like yours. Had no idea what to set the inverter (Sol-Ark 8K) to before watching your video. I have a 14s100p 18650s battery and currently run them 54 volts and 45amp limit (very conservative settings). Plan to replace them with the lifeP04s, but since the voltage is nearly identical, might try parallel at some point.
I like your accent. Damn, it's soothing.
Watch all the videos again, there is more accent in every of them😂
Halo Andy. I have binge watched all your videos. They are great and I love how you keep focus on the subject matter you speak off. Also enjoy your small jokes and I don't know what accent people are talking about! ;-) I am originally from France/Alsace. I speak German and Swiss German and I am used to it.
Would you think about making a video about current status of your overall system? Checking the panels, checking the current state of charging. I know its winter time in Australia so perhaps not the best time. Or maybe it is for comparison purposes?
I have learned a LOT thanks to your videos and experiences regarding the Victron MPPT and shunts. I run an off-grid WIFI backhaul communication tower in the middle of the jungle in Mexico. I use a 100/50 MPPT with the 500A shunt and a Raspberry Pi for remote monitoring and it is the BEST upgrade I have ever made on the system. I have 2x 450W panels and 6x AGM 110Ah batteries. I draw about 105W or 2.6kWh and can survive with no sun for about 5 days. My batteries never go lower than 90% which is great (specially being AGM batteries). My dream would be to add an inverter so that when we go up for maintenance, we have 110V AC power. But I can't justify it.
THANK YOU
Thanks a lot for sharing, Thierry. That's a great system you have set up there. I like the fact the AGM won't go under 90% often, so they should last quite a while.
I can certainly make a video about the actual status of my project... great idea.
Thanks again. Mach's gut!
@@OffGridGarageAustralia Danke! I wanted to send you a photo or 2 of our installation. I think you would find it interesting. Let me know if I can find an email address for you somewhere. Weiter so!
@@itsdouetthierry Hi Thierry, I think Andreas' email is on the Home page near the SPAT section. Middle of the jungle in Mexico sounds amazing. Marji
37:57 "User Private Data"
This is a ONE-TIME user changeable data. You can enter a string and it will be made PERMANENT!
What use for? Use as a signature like "Andy's JK BMS" such that if stolen you know it is yours.
Or Battery name like "JK BMS Bank #1". So when you have multiple JK BMSs around and you want to know which JK you are viewing, just go over here.
I repeat, this can only be changed ONCE.
in app version 4.9.3 it can be changed over and over
@@ajnsan NICE INFO! Thanks!
@@ajnsan I tried it today: version 4.9.3 and all the other higher versions, no dice.
Hi Andy, maybe this is not new for you, but while I was following this video to learn a bit more about the JK-BMS settings, I found that my version has a new setting called "Device ID", what can be very usefull if like me you are using the modbus driver for Venus OS.
Exactly, we just come here because we want to see and here you! Battery learning is just a plausible excuse...
Excellent guide, thanx Andy 👍
Thank you.
I’ve got to banks at 24 volts, 560 amp hours per bank. Two 280 cells parallel 8 cells in cerise. I have a jk bms on each bank. I’ve been running them now for over two months with no problems at all. If you have settings right then you should have no problems.
Thanks Alan. Does the balancing still work ok with two 280Ah cells in parallel?
@@OffGridGarageAustralia they stay within.03 milamps when close to the top. Can’t tell as they go down because they all stay about the same in the flat. But yes, very close.
@@OffGridGarageAustralia Using your method of balancing by starting at 3.45 seams to work well. They seem to drift a bit when lower, like 3.3 and it’s mostly under load then, but when they hit that 3.45 mark, they are really close together
Thank you - this is what I am looking for and very well present - cheers :-)
Andy, I just got the JK and downloaded the software, so I believe it is current... my settings do NOT have the "Max charge current" setting, instead it has a "Continued Charge Curr(A)" and a "Continued Discharge Curr(A)" settings. Any ideas where I could find info on how to set those? THANKS for all your great work!
So if the maximun configure voltage is ecseeded ,the bms cutt of charging only or cuts off both charging and discharguing ???
Only charging, you can still discharge the battery through the BMS in this case.
Hi, thanks for your very interesting tutorial on the JK BMS. With regards to the B2A20S20P BMS. My question is with regards to the connection of this BMS to the Victron system. What would the 4 pin port be set to RS485 or CAN?
Thanx from Norway, i see u have 3 banks with each bms,, do u only use 1 mppt on each of them,?
(victron mppt,, what size)
Then,,, more, ? from me, 😅😅 do u use 3 different inverters,?
Thanks Ronny, all three banks are in parallel, so all charge controllers charge all the banks at the same time. I have 2x 150/70 and 2x 150/35 charge controllers. I use two Victron inverters connected in series.
Hey Andy, like aways amazing videos and explanation thks, I am from nj and trying to put the System together I have a 24 v 280 ah lifepo4 battery bank and 3000 watts reliable inverter and 8s jk bms in .my problem is when I try to use my heat gun 1500 watts on and the inverter shut down you think it's any parameters on the BMS ? I used the parameters in your video ? Any change I can make to stopping this ? It's the only thing plug in the inverter, plz but u can help me out , and congratulations for all your videos 👍👍👍
I have similar issue.. did u find a solution?
I believe you said that you don't turn on the "Balance Only When Charging" feature. That is probably fine in your location but I turn it on here because our temps easily go below 0c. Setting the cell CUT (charge under temp) protection to above 0c is not enough to prevent damaging the cells. This is because the CUT only controls the FET's and stops the current into the battery. However the balancing current is still allowed between cells when the other balance parameters are met.
Hi Andy, long time viewer (really enjoy your videos), first time commenter (well, it's more of a question really). I'm looking into building a 12v battery for my caravan. Thinking a 4s2p (8 100ah cells) would the JK bms charge/balance correctly in this configuration? Love to get your thoughts.
Hi Andy, absolutely brilliant video and great timing for setting up my system. I wonder what settings you would suggest to not max out my batteries on either charge or discharge ? Also would I need to alter any of the charge parameters within the
multiplus 2.
All of the charging from my solar set up comes through the multiplus to the batteries.
Many thanks Steve
The configurable sense wire resistance settings may be for mobile applications (boats, RVs etc) where some batteries are in one location and others are much further away in another. This gives different resistance and voltage drops for the packs' sense wires
Cable length will not make a difference when measuring voltages.
Hi Andy, love your videos !
On the subject of voltage drops and cable restistance, TEST IT 🤓
@@OffGridGarageAustralia sense cable wire resistances will make a difference while they carry a balance current. If the BMS unknowingly copes with high wire resistances while balancing, it will affect balancing performance (balance current will add negative tolerance to the cell which is being discharged, and positive tolerance to the measured cell voltage of the cell which is being charged, resulting in an earlier than necessary completion of the current balancing step. As soon as the balancing stops and the measured cell voltages represent the real cell voltages again, it will continue balancing the same two cells)
I'm still testing, this value is to calibrate the voltage on load. If you stop charging or discharging and you measure a cell the BMS give you the correct voltage but on charge it will give a different voltage since there is a potential differential, if we don't calibrate we will have some cells starting to run away. I had one cell that had 0,1 overvoltage on top charge, this lower the capacity in 9Ah in 3 months, after changing cell position on the battery I notice that the voltage of that cell was normal. I had the same problem in another battery and changed the value to 1 milli ohm and it lower the voltage and it stop being the one with highest voltage. Test your cells independently and record the values, if BMS give a different one adjust this value, this is only for balance but since the worst cell will have the highest voltage on charge it will stop charging when reach balance voltage and start discharge to equalize the voltage, so balance will discharge the weakest cell. Using Andy 3.45V will reduce the problem but won prevent this.
@@OffGridGarageAustralia
What about cable length when you’re balancing? Then you are drawing or pulling current from the individual cells … relative small amps… I know
And what if sensor cables are not of equal lengths due to setup of the battery bank ?
Thx
Can the JK- BMS firmware be updated, and how?
No. Not yet. I have asked for this feature and they added it to the wishlist.
I sure love your videos! I just got my JK JK_PB2A16S15P and love it. To be able to monitor and actively balance the my new blue baby batteries make my heart sing! 🥰 Andy do say hello to the frogs and have another beer on me!
Did you have any issues with it staying connected to Bluetooth?
No. Only sometime when I switch between two of them I have to click on it again@@SomethingToday30
@@SomethingToday30 No, seams very stable.
Ask and receive! Thank you for this video! 👍
Rule #1: Always listen to your audience! 😉
Just bought newer version of the JKBMS 4-8S with CAN & heating, because I messed up my original unit. The new bms has two more settings for protection, beside Cell OVP, it also has Battery OVP (default at 3.5V), any idea what I should set it to?
Was wondering this as well. I guess it should be like 56 volts or whatever if you have 16 cells? not sure if that's true.
Their manual doesn't even mention it.......
@@gg-gn3re so it seems to be voltage at which the bms should reset to 100%(for Battery OVP, and it is voltage of cell not x8 or x16)
A big reason for the for the cell wire resistance is due to the high balance current. I have mine set to balance to within 0.008 volts (8 millivolts). When it detects a high cell more than 0.008 above, it will start pulling 2 amps from that cell. With a wire resistance of 0.147 ohms, 2 amps of current draw will cause the reading to drop 0.294 volts. 294 / 8 = 36.75 That is an induced measurement error of 36 times as much as the voltage difference we are trying to measure. And the revers happens on the low cell. When it tries to push 2 amps, the voltage will jump up that 0.294 volts. That is not the real cell voltage, it is only voltage drop through the balancer wires. When you first power up the balancer, it cycles balance current in and out of each cell to measure those values. It then calculates a correction factor when it is pulling or pushing balance current. It is actually a very smart way of being able to monitor the cells while balancing.
Thanks Luke. But the BMS will only ever measure the voltage of a single cell OR balance this cell but never does both at the same time. It may show the cell voltage during balancing but I doubt it takes this into account as a real measurement as this would make no sense.
Do you have a newer video with the new settings? They now have "Battery OVP & OVPR" which you'd think would be like 55volts? but it defaults to 3.5 which makes no sense because that's the "cell" voltage not the battery one
Awesome conclusion of the jk hmso settings! Sadly I'm still missing the heating function part... Looking forward to getting any further information on that, since I'm building my battery within the next few weeks. Greetings!
The 4s one I had in my hand has the heater function but I don't have the cable for it to connect anything. I will have a look in the BMS settings to spot the difference.
@@OffGridGarageAustralia Anything new here? i will start building in the next weeks and want to add the heating function from the beginning - i have no clue how to use it or which pin is what. any idea where to get the correct cable?
cheers from sunny hot germany :-)
Just a note relating to the inaccuracy in the current reading you found over the full range....there are 2 parameters the designer's need to implement in firmware for getting an accurate measurement ... scale (the multiplier) and slope(controlled by an offset). Seems like they have neglected setting the slope properly in this case hence it'll only be accurate around the calibration point....
Anyway as you say ,in your case its unimportant as you're referencing the victron shunt.
A coulomb collector is the only accurate way. Not using voltage as the reference.
@@krg038 Hum coulomb collector is for Ah not A
@@DrCoolZic correct. Ah collected SOC
Apparently the calibration works fine with pure DC loads. As we use mainly inverters, we always have DC ripple which stuffs things up. I'm not too concerned as I have the smart shunt as point of truth.
There is a very lack of information about the own consumption of such devices.
How quickly will such BMS batteries discharge if they are not constantly charged?
Heya, I probeble go with the jk bms so this is very useful info for me
Thanks a lot. Great source of info
I have 16 eve 280ah cells connected in series
The default jk bms charging current is 25a
Is it safe if I change it to 150a?
Well, that depends on your cabling. If the cables can carry 150A then yes, it is safe.
Good morning Andy
Thanks for your great videos!
I've had a problem since yesterday.
I finished my project about 7 days ago. At the beginning everything worked fine. Now cells 3 and 4 are not recognized in the BMS.
I have checked the cables. Up to the flat connector. The voltages also arrive there, always 3.3 volts more....
A reset also makes no difference.
I saw in another video that the input resistors were defective. Have you had or heard of such experiences?
Greetings from Germany
Sooo nice, thank you very much:)
Hi Andy, my app has a line item called "Charg. Plugged" and it always says "Not Plugged" regardless of whether I'm charging or not. Do you have any idea what this parameter means?
I do not know why anyone would adjust the sense wire resistance manually when the BMS does it automatically. Andy, did you leave your sense wires full length or cut all of them to the same length? That would seem to be the case given that all of yours are about 0.15mohm. I cut mine to length to keep a neater installation and my IR's range from 0.123 to 0.143. I did not do anything to get those values other than shorten the wires.
Mine are all extended as shown here: ua-cam.com/video/3gm9LvKl2qs/v-deo.html
It makes no difference if you cut or extend them. The BMS will either measure the voltage or balance with 2A, but never at the same time. So voltage drop is not a thing.
Hi Andy, I bought the JK bms since you recommended it than a Daly, and thanks for that, but I need to know what size of lug hole is best for the 280 ah Eve, 1/4 or 5/8 or the 3/8. I haven't purchased the cells yet so I'm not sure what works best of the posts, it's nice that your showing your findings on the lithium batteries for us beginners, have a great day 😊
Thanks for your comment. The EVE cells all have 6mm studs or holes. Not sure what this is in imperial size... I think it's 1/4.
Thanks buddy, I was just looking for the info on that, with no luck, lol, so thanks buddy, love your testing, have a great day, cheers :)
Hi Andy! I thank you for your time and for the immense value of your sharing of knowledge and passion. I'm having problems activating the discharge with a voltronic inverter (pip max 8kw), when I activate it, the short circuit protection without sparks immediately starts without any visible problem, the wiring has been checked and rechecked a thousand times, in some forum they told me of precharge problems. The discharge is activated regularly if I disconnect the positive pole with the circuit breaker, so the problem is precisely the inverter, which parameters do you recommend me to change (scp delay?)
Hi Ross Doc, there will be too much inrush current. I had a similar problem. When switching on three mppt charge controllers, the SCP always came. I doubled the SCP time. From 1500 to 3000. Now it works for me.
hello, In the BMS B2A24S20P, is it possible to connect a display?
I think the balance wires resistance calibration settings are for balance wires cut or extended to different lengths for your installation set-up. Now I'm curious to know how different a few inches or feet would matter. ARE people running their BMS 20-30 feet away from the cells for some reason?
I have cut all my cables or extended them to make it look nice. But I never touched this setting. I think the BMS either measures voltage or balances but not both at the same time, so cable length should not matter.
@@OffGridGarageAustralia It is an odd thing . maybe for the internal resistance of each battery?
It would be great to pick the brain of who ever dreamed up these functions. I like a good puzzle but, come on man. What is charg plugged and heat current? It's nothing to do with the heat pad function or charging.
It took me a week to find a working app for my phone after trying to reinstall it. The one on the BMS and instructions would not install again. only on my sons new phone.
yeah this is the one for me. the blutooth is what i was looking for but the capacitor balancing is brilliant.
i've contacted them on aliexpress to see if i can buy the 24s and connect to my 20s pack till i switch to 24s, or will cells not being connected cause an issue
You can use the 8s-24s BMS for your 20s battery and follow the instructions on their website on AliExpress. Very easy to setup as you just leave the unused cells disconnected.
Link is here... off-grid-garage.com/battery-management-systems-bms/
User Private Data: is a description for the battery it will help if like me you have more than 1 battery with same capacity.
How does this work though?
Not for much I control my 3 JK and Smart shunt in Hassio and there I don't have this field, in my case I use it to record the capacity of my last top balance.
It's early since I only start to test it today but seems that the Con. Wire Res, is very useful, because the voltage is incorrect when balancing, one of my ports had an overvoltage deviation of 20mV and this discharged the cell on balance, in 3 months it lost almost 9Ah, when I increase the con wire res in 1m Ohm it lower the cell voltage and stop the discharge when balancing.
My procedure to calibrate it is stop, charge, discharge and balance and measure the voltage of each cells and compare with the BMS, in my case the values in the BMS are correct to 1mV. After charge with a constant A and also turn on discharge but without load and measure the cells again and you will see differences in voltage you measure and in the BMS, to lower the V increase the resistance in steps of 0.5, haven't test if it accept negative values to increase the voltage.
@@OffGridGarageAustralia
i wanted to ask a question about jk bms............how we can use its gps. interface feature? any idea
Any idea why a 200amp v15 would flash the RUN led red, I have 2 identical BMS/Packs, one flashes green, the other flashes red.
So Andy,
When were you going to do the heli coil on your cell of 1.0 battery bank? Or did you decide to try welding a stud to it? Think would make a good video!
It's in the next video from this morning. Good timing.
how did you integrate it with VRM?
I didn't. It would make no sense as I have three different BMS in my shelf and having reporting only one, makes not much sense. As good as the JK is, it's not the right BMS for communication and having batteries in parallel.
But if you have only one battery, I made a video on how to connect it to the Victron system: ua-cam.com/video/sHIlP2oJ3DU/v-deo.html
who else is here for the content and bonus accent?
Sir, nice and detailed video, and you mentioned several times that the battery would shut down, but it is not in all situations that the bms cuts off the battery pack, in most cases, it just cuts off the affected cell alone. When there is an OVP and a cell is at 3.6 which is my setting, that cell is cut off and the remaining 15 cells continue to power the inverter because 15 x say 3.5 is 52.5v which is okay for the inverter. In the case of UVP, when one cell reaches 2.6 which is my setting, that cell is cut off and protected by the bms, but the remaining 15 cells at 15 x say 3.1 average is 46.5v which is below 48v which is the cut off voltage of my inverter, and in this situation the inverter shuts down.
So, from my personal experience, I don't think that an OVP would shut down the battery.
Hi, what type of BMS do you use?
@@d3claes I use the JK BMS jk-b1a24s-15p.
I don't think this is possible. You cannot take out a single cell and run the power past it using the small balance cables. It can only disconnect charging/discharging for the whole battery bank, not single cells.
If you want to make a video on your channel, we're all watching 😉
@@OffGridGarageAustralia My point actually is that with OVP the battery pack is not shut down and the inverter continues to work.
Yes you are right, because when OVP occurs, charging is stopped until the affected cell recover.
There is no need for me to do a video on the matter because you are already doing a wonderful job for all us.
Another very useful video - Many thanks Andy! I bought one of these and finally had my battery built and connected up. I started the BMS and all worked well. About an hour later the power cut, connecting to the BMS with my phone, I could see it had disconnected the power due to low cell voltage - I planned to wait until the next day for the sun to charge the battery again. Half an hour later the power came on and the BMS was showing 'Discharging MOS not normal' blinking in yellow - since then the BMS reads very differently to the Victron inverter/MPPTs in my system and even if I click to disconnect in the app of the BMS, the BMS beeps but nothing happens. . . I am wondering whether when the BMS reconnected my system the surge of current re charging the capacitors in the inverter (10kW Quattro) have killed the discharge MOSs . . . I have contacted the seller who kindly just sent me links to the app and instructions. . . 🙃 Any thoughts as to whether I can do a reset on it or other ways I can test it before I have to start crying and buy another one are greatly appreciated 👍🏼
Well explained Andy, Thanks Andy
Thanks Ross!
I believe voltage does drop as resistance increases. Therefore, to get more accurate balancing, perhaps it's prudent to input the wire resistances in the settings? Although with such a miniscule amount, it probably doesn't make much difference.
I don't think the BMS will measure voltage while it is balancing. It's either or but not both at the same time. Therefore, the resistance of the balance cable does not matter.