The new JK Inverter-BMS: all settings, features and functions explained, everything you need to know
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- čas přidán 29. 01. 2024
- The new JK Inverter-BMS is now on the market for a few months and gets constantly updated with new Firmware updates. It is time to make a video and explain all the setting, features and function of this great BMS. As this BMS has now a full charge algorithm and a lot more settings than the previous versions, it can be quite confusing and difficult to get started.
In this Video, I show how I would setup the BMS in a production environment and how to set important features like absorption and float voltage and the respective timers.
I also explain how the buzzer and both relays can be programmed. These are fantastic features which came with one of the last updates.
This video was made with firmware v14.20.
The new JK Inverter-BMS with all features, functions and prices. 16s 100A, 150A or 200A all with active balancer and all features as shown in the video:
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My settings with screenshots:
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BMS Active Current Limiter - Safety Feature or Gimmick?
• BMS Active Current Lim...
Current Limiter Test Seplos BMS 10C, 10E and QSO Tiangbangda BMS
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Thanks for taking the time to go through all of these settings with us. Great content as always! Looking forward to watching you get your "hands dirty" on the next one. Take care.
Thanks for your feedback....
My prays has been answered, thanks Andy for reading wishes and also membering us newbies. Priceless.
You are very welcome
Hi Andy, a very big thank you for all of the work (and humour 😁) that you put into your videos. I have learnt so much from you. You have given me the confidence to build by own system and my new JK Inverter BMS has just arrived, so a perfectly timed video 👍 My system also has 16 280Ah cells and a Victron Multiplus 2 5Kva. I am starting by just buying cheap night electricity and will then be adding solar. I have just bought you a beer 🍺 as a token of my appreciation. Best wishes from the UK 🇬🇧
Thanks for the feedback and 🍺. I appreciate both!
Yes, you can do that as well and sell the power back to the grid at peak times. VPP are the future and very popular here in AU.
Perfect timing. I really just installed the new bms and started the configuration...
Please continue the lovely videos... they are even funnier to watch as an german native speaker... "Zollstock"
Herzlichen Dank aus der Schweiz
Danke Dir for your feedback😉
I had watched this video before, just because I watch them all 🤭. But now I've got my first JK, I had to watch it again. Thanks Andy!
Thanks a lot for your support. It is much appreciated!
Thank You! Thank You! Thank You!. Having all the settings in one video is fantastic!!!
Glad it helped!
Great video Andy. I always enjoy your BMS videos.
Thanks for the feedback!
Its taken quite a number of years but these BMSs are finally starting to get good.
Yes, especially the JK here seems to be the one to use. Finally.
Can’t wait for battery shelve update ! BMS topic as been very well covered now !
Good run through.
On the wire resistance settings, each BMS sense wire is shared between two adjacent cells. There is a resistance in the battery terminal ,about 0.05 milliohm for good terminal connection, and about 0.07 milliohm for nickel-plated copper core bus bar.
When there is moderate inverter/charger current, the terminal and bus bar resistance effects the BMS cell voltage sensing. BMS has control over balancing current but does not have control over random inverter/charger current. BMS does read total battery current so it can calculate and wash out the voltage drop caused by battery terminal connection and bus bar. At 100 amps it can amount to 15 to 30 millivolt drop in cell voltage measurement. Not a lot of voltage but enough to cause balancer to make wrong decision on balancing choice.
So informative!
Thanks a lot Andy!
Thank you
Great job Andy really helped me install the first 2 in some telecoms batteries which had blocked original BMS both with 15 cells 100ah now running on my 100% Off Grid home ( a little cabin in the desert of Chile)regards
Great! Thanks a lot for the feedback
JK are missing out on a huge customer base (and you on a massive load of new viewers!) People in boats and camper vans need a BMS where the relay can be programmed to disconnect on any situation that would cause a charge disconnect so as to save the alternator diodes from going pop when this disconnect happens. The relay would be used to disconnect the alternator field wire in any event that causes a charge disconnect. A delay of a second or so before the actual charge disconnect would be ideal too. If a temperature sensor could also be connected to the alternator frame and be used to reduce charge current at high alternator temperatures then JK would have a BMS that would really appeal to boaters and campervanners. It is a huge market that is now really getting into LifePo4 but at the moment but is having to deal with the alternator diode popping and alternator overheating problem by using either DC-DC (very inefficient) or smart alternator regulators such as the Wakespeed or Mastervolt Alpha Pro III (very efficient and good for alternator temperature control but still no good for charge disconnects) or even worse people are connecting their LifePo4 to a lead acid battery to protect from disconnects and then using a long wire from the alternator as a resistor to limit alternator output to stop their alternator burning up! (yes this really is a popular thing - especially on UK narrowboats and is being heavily promoted by people who don't know what they are talking about on places like FaceBook). Come on Andy get JK to build the ultimate BMS that works for home power situations as well as boats and campervans that need to use a BMS with an alternator.
Good point. I guess most of these applications retain a lead acid starter battery - so connecting the alternator (or alternators) can be wired to the start battery and then the cross charge to the lithium house bank can be done with an intelligent split charge relay. Of course this might still result in an unintended (and avoidable) disconnect of the domestic battery. But if the two dry contact relays can be programmed as Andy says (around 25 mins in) you could set a voltage above charge voltage limit - but before over voltage limit - to control a split charge relay or the field supply to the alternator. I think that would do it.
@@paulholland2380 The manufacturers of the LifePo4 cells state on their data sheet not to connect their cells to batteries of a different type or make so connecting to a lead acid and mixing your chemistries goes against the manufacturers advice.
A battery isolator can be used to make this irrelevant.
Cant wait for the next video with some good old DIY (Back to basic) I hope.
-Not that this was bad....no no. Keep em´ coming.
Im in the sandbox still with a 4 cell 12v system waiting for 4 more for a 24V, DIY.
You have given me all the inspiration and excitement to go the DIY path.
Thanks for your feedback. I have to mix things up here and there to please everyone😆
Great video Andy, thank you so much! 🤘🍻
Thank you.
Thanks Andy, perfect timing my 2 new JK Inverter BMS are in Customs Melbourne at the moment. I'll swap them out and give they a try 🤞
That's good to hear, Wayne. Hope it all works out and you enjoy the new BMS. I quite like them...
Thanks, very informative
I bought you 3 cold beers sir! If they aren't cold its probably your bms failed and let your batteries go low! The best videos on youtube. Thanks
Thanks Andy, as always 👍
Thanks Dave!
Heya, thanks for all the vlog about bms's batteries ect ect. now you earned a nice cold bier
Thanks a lot for that, my friend. I appreciate it 🙏
Danke andy wieder super erklärt und ich mag dein englisch, das ist so verständlich🎉👍🏼👍🏼 schöne Grüsse aus 🇦🇹
Thank you for your feedback!
Andy, about your question for the use of sense wire resistance : there is a current flowing during balancing, thus also a small voltage drop. If you enter the wire resistance, the BMS can compensate for the voltage drop and make balancing more precise. Otherwise the voltage will slightly drop with the balancer off, causing the balance to stop just a bit to early. But the voltage drop with the standard cables at 1A won't be much.
But with longer wires it might be needed.
Would be about 100mV drop with an amp in 6' of 22awg? I'm guessing it's already compensated, with the adjustment for calibrating for cut or extended leads.
Thank you. As I said, the BMS is 'clever' enough not to balance and measure at the same time, so resistance should not matter.
Thank you keep good video's 😊
Thanks, will do!
Hi Andy! Great job as usual.
Would be VERY cool to have charge current limitations based on SOC and temperature settings kind of like what Louis' driver does. Please make mention of this to JK for us :)
Thank you for the feedback.
Why should we limit the current based on SOC or temperature?
@@OffGridGarageAustralia It's stressful to (dis) charge at high C-Rates when cell temps are too high or too low. When the cells are at a high or low SOC it puts even more strain on the cell.
For example, the datasheet sheet for my LF280's says at 10°C and 90% SOC to only charge at 28 amps.
Thank you Andy for all the details. I set up my JK Inverter-BMS today, and this plus a few previous videos were all of great help!
I have a question though. I am currently waiting for a delivery of LF280K cells (hopefully not lost, it's been already 4 months), and in the meantime I'm running off a bunch of Samsung 33J 21700 Lithium-Ion cells (56 as of now, and counting). The capacity is still very small, and I only draw small currents for the time being.
So I immediately noticed how badly calibrated the JK Inverter-BMS is when showing the current draw from the battery. I tried my best to calibrate, but when calibrating for let's say 10A, the lower the load is, the further away the BMS current reading drifts.
I put a multimeter in series for more precise current reading, and I was able to confirm my Victron Smart Shunt is quite spot on. So I can now confidently compare the JK reported current to the Smart Shunt. It's always off somehow, no matter what I do with the calibration. I was not able to use a precise enough load today, so I will try to do a better job at calibrating this another time. Maybe I just calibrated badly.
But I've seen you show the current reading issue in a previous video. I was curious if this is something that can/will be improved by JK with firmware updates in the future? Not sure if an update can make the current readings more accurate and maybe increase the precision as well. Right now it goes from 0 to 0.4A, then 0.8A, then 1A, and it doesn't match at all what my Smart Shunt measures. It looks to me like a big deal, being able to precisely monitor how much current is being pulled/sent to the batteries at any given time.
I am going to order a RS485 adapter for the updates, and a Raspberry Pi hat for the connectivity with Venus OS. For now I can not link the BMS to my Victron system yet to experiment with that.
But if the BMS reports erroneous current readings, I will have to figure out how to use the BMS to control the charging & use the Smart Shunt only to display the full battery current readings. Can this be done? I was under the impression the BMS will take the place of the Smart Shunt entirely. I'm not talking about configuring the Shunt for a "DC system", but using the Shunt to monitor the full battery current going in and out instead of the BMS.
Like# 102 - sneaky and no notification...
Another great video to remind me that I'm so thankful I don't have to do any of this with my batteries... but if I did, I'd have a great resource!
I'll try my best to sneak these videos in as quiet as possible... 😉
Excellent bro. I've just gotten three of these things and a big stack of EVE cells on the way. Be at least a month before the cells arrive and I'm able to get to them. Playing carpenter for for the next month building a bug / solar shed. Winter coming full blast next week they claim and my bones move slow in the cold. Delays delays delays..... hahaha
Cheers!
Nice, you will be very busy soon with all this equipment!
Born from the need to grow maggots year round for some chickens. Turned into quite a little project.
Idle hands are the work of the devil they claim. :)
25:35 3 very cool fonctions, uh not very cool very powerfull fonctions !! Thank you for this great video again! :)
Hey Andy, thank you for your explanation regarding absorbtion and float which makes absolutely sense to me. I am using since a week now a Victron ESS with 3 MP2 5000, a Gobel Power GP-SR1-PC200 with a PaceBMS, a Victron SmartShunt and of course a CerboGX. Right now I let the BMS do the job. Means no float mode. How would you do the setup there to have absorbtion and float-mode? DVCC "ON" ControllingBMS "No BMS Control"? System Setup: Battery Monitor "SmartShunt"? Is there anything missing or is there any other alternative setup for it?
Thanks Lukas. The PACE BMS does not have a float mode setting, so the BMS allows to charge to the absorption voltage and stays there until the sun goes down. If you set this voltage conservative, like 55.2V with 14A current, it should be OK.
Definitely let the BMS control the Victron system through the DVCC and also set the BMS as you battery monitor. That is a huge safety feature. You actually don't need the smart shunt any more in this case as the BMS is now your shunt.
Hi Andy, great video. Any idea what the blue push button next to the dip switch is used for?
Hi Andy,
I've been following you for some time and I'm building my own DIY photovoltaic system. I have almost everything and the only thing missing is the batteries and until a while ago I was very skeptical about lifepo4 and I was leaning towards gel agm, considering them less dangerous. and being in possession of a !mpp solar pip 4860 LC" inverter which is a little old but in real mule without a lot of "electronics" so it cannot be connected to my Tracer 10420AN regulator nor to the BMS.
do you think that you can only manage the batteries and any protections on the regulator or is something simpler better, I like this BMS that you have illustrated very well and I am tempted to buy it, but I wouldn't want to make an oversized expense since it doesn't communicate with my inverter.
Thank you for the valuable information you teach us,
Greetings from Italy Stefano
hey Andy! nice videos, I always enjoy. I recently setup a victron system with a DIY battery and new JK inverter 200A BMS (no smartshunt, JK calling the shots... risky ? haha). Anyway, its all working pretty well aside from a few niggles... (the JK is running the latest firmware as of a month ago or so, 15.something I think)
1) the battery capacity / consumed / remaining AH doesn't seem to be sent to the cerbo by the JK, is this normal or something is up with my system? do you think JK will fix it?
2) my RCV is 3.45V, 100% soc 3.449 iirc, but sometimes if the soc is >85% or so and a big charge comes in (4+kw) from a brief burst of sun some cells momentarily jump up to 3.45V, the SOC jumps from 85% eg. straight to 100%. Bit of an issue with their algorithm, I wonder if they would add a timer or something in future or a tail current before SOC reset, maybe you could mention it to them?
cheers :)
Great stuff, thanks for your help, Andy. I use a few of them, simply because my car taught me the huge advantage of user firmware update. Do you know, if they will include Epever MPPT controllers in their communications menue? Also: If one cell goes overvoltage the bms would command the charge controllers to stop changing??
The BMS will not talk to MPPT chargers directly. Only to an inverter-charger (hybrid inverter) or the Victron Venus OS (which then controls the MPPTs).
Yes, any OV, OT or OC will stop the charging process of the inverter. Same as UV will stop discharging
Hi Andy!
As JK is unable to produce a real manual for the PB-series (for the old standard series they have one) i want to point out about the confusing red LED of the additional board. The red LED stands for the alarm. Confusing is, that it is on immediately when connecting/starting the first time. So when there is a REAL ALARM it will FLASH ....... and you can read the info on the 3rd page of the 4.3"BMS and in the APP/Win monitor.
So JK-PB users should not be shocked because of the red non-flashing ALARM-LED!
Thanks for all your videos, I have learned so much and they have encouraged me to build my own battery to add to my setup. However I find the videos raise other questions too.
I want to build a 280Ah battery and use the jk BMS. However what size do I buy? The 100amp or 150 amp? And the 1 or 2 amp balancing version?
I would then like to replace the existing pace BMS in my other three 100 ah batteries. So assume again these require a different size version?
Than finally can different size jk BMS be connected together for the victron canbus? Or do they all have to be the same version?
See I told you so many questions. Will be very grateful if anyone can help
Thank you.
Well, the size of your BMS depends on your load you want to drive with this battery. So, the 100A BMS is good for around 5kW and the 1A balancer is totally sufficient.
Hey Andy, great information in your videos, well thought out and explained very well. We have 2 different models of BMS one has the SOC max/min setting and the other does not, can you suggest a way to make the BMS without the SOC feature work the same as the ones with the feature? Would a software update fix the issue? JK_BD6A24S8P (no SOC feature) JK_BD6A20S6P (with SOC feature)
hi great videos, is these the bms Top 1 ? wires look thin for 2a
Hi Andy, you wondered why the disable temp sensors is there. Well, on one of my BMS the temperatures are all returning around -40ºC. So I've had to disable them. Thanks for the great work. Andy
For the people living in some cold country there is one feature missing, or incomplete.
The temperature when heat start, that must be higher than the temperature when stop charging. ( custom value will be great)
Or for the relay to start at low temp, and use some wire ( not so elegant)
I use at this time adițional Relay for heating, long way read temp from bms, get in a thermostat in HA, command to a relay inside the battery box
And low-temperature trigger for dry contact... Here at 15.10 firmware still missing...
2 amps is not enoth for heating anyways. Also heating is turned on even if there us no charge current present, so you need to implement your own heating logic anyway
@@RFDarter You're right with the logic, with HA I have more option when to start the heating.
About the 2A it will be enough, my heating curent is 1.8A, is set at 8 degree Celsius, the heat start when sun rise, so it start heating before the panel start getting power
@@gepettoautomobile 2A is enough. You're right. I have about 1.6A with 5 heating pads. But still want to use dry contact to control bigger relay.
@@gepettoautomobile 48V System?
If so then you dont even have 100W of heating power with 1.8A.
With 100W it would take 14min to change your battery temp +1°C.
If your battery cools down to -3°C it would take 1 hour and 40 min to get the batterie to 5°C.
Not considering any losses, so it asumes you battery is perfetly Isolated, so it would take more like 2,5 to 3 hours.
Thanks for all the info Andy!
Does JK provide a manual for this inverter BMS? I just got one, looks nice, but I can't find any kind of manual.
Hello, I'm a little lost with this bms and I'm hesitant with the old one which works perfectly but I have 2 B2A8S20P models but Victron only sees one, will the PB2A16S20P help improve that? it is so logical to balance cells and batteries that no one thinks about the communication, the master slave interface based on esp32 is a good idea but it must be integrated into the bms. Thanks
Hi Andy, I have the v15 hardware and there are differences from the v14 hardware. You could make a video explaining what is changed.
Andy, thanks for another great video. Could it be that Cell OVPR(V) means that the system will not allow more current to flow into the battery, but that it will allow a discharging current? You would get safer voltages much earlier than with a full disconnect. Or would that only work this way k with systems with a different Charge and Discharge port? It would be relatively easy to use the MosFets as diodes, allowing current out, but not current in when voltage is above OVP
Yes, of course, an OVP will only disallow charging but discharging is still active.
Hi Andy, I have a question regarding integration into a Victron Cerbo GX. With the new JK-BMS, do you have to install a script from GitHub (serialbattery or similar) or does it work without? Is there a special setting for this?
I'm asking because I want to build 2 modules now and have therefore ordered the JK-PB2A16S20P, which will hopefully be delivered soon. However, I still have to get the cells.
I wanted to install the basic system so that I don't have to play around later.
Thank you and best regards from Germany
Nobody is stupid, we are all learning...
With the new JK Inverter BMS, this can be directly connected to the Victron Cerbox GX using the Victron CAN Type A cable.
I've made a few videos showing that.
Hi Andy thank you for tour work on that piece!
How many cycles do you have to do to complete the learning step please ?
Thank you.
I have never done any cycles and just set the capacity to 280 or 304Ah whatever you had. From there, it was always pretty accurate.
All is working fine but my soc is not accurate
Hi Andy, I need your help. I install two batterys(new jkbms) with Growatt inverter. I set "Continued Charge current" as 40A (both bms). Then the charging current on inverter is 80A(command from bms) and the inverter don't allow me change a charging current(on inverter) because BMS send a command to it. In the ideal situation, both battery will be charged 40A on each unit. But the real situation that I face sometime. The first battery is charged 50A and second battery is charged 30A. Then the first bms is turn off charging port via " over charge current protection". I think Jkbms should have separate "Over charge current parameter". Please suggest me.
Thanks!
Thank you very much!
Andy, great videos. We're learning everything from you here. Even us in the Czech Republic, and we are a nation of do-it-yourselfers :-) I'm going to build a system on Victron with 280Ah cells and I don't know if I should buy the older version of JK BMS with 2A balancer or this new one ? Thanks
Andy can the Mulitplus-ii be connected to Raspberry using can bus without the MK3 adapter
No, MK3 is necessary as the MP II uses Ve.Bus for the communication, a proprietary protocol only used by Victron. This is not CAN bus!
Hi andy, Would you be able to explain the state of health parameter which you can see from jkbms in venus os? It sometimes drops. I have to change ah in the setting and it goes back to 100% not sure if it has any real function?
Any BMS calculates the SOH as per some algorithm. We don't know how and what the calculation but I'm sure, every manufacturer uses their own calculation. So, personally, I would not care too much about it. We don't know for sure what the real SOH is unless we do a full capacity test again as we did at the beginning for this particular cell. So take this with a good with a good pint of salt and use it as a rough guide only.
what are the benefits to disconnect the positive instead of the negative? if between battery and bms is nothing else connected?
i want to replace the seplos.
btw. can jk comunicate with seplos ? and how accurate is the jk shunt if there are no full charges for 2 weeks?
I always liked the Seplos for that feature switching the positive rather than negative line. Positive is recommended, switching the negative can cause issues...
Replacing the Seplos with the JK is not as easy because of that major difference.
JK cannot communicate with Seplos or any other BMS. In fact, all BMS I have tested did not communicate with other brands. They all use RS485 standard but have their own individual protocol.
I don't know for sure how accurate the measurement is but can only say, the old style JK BMS is pretty accurate when compared to the Victron Smart Shunt.
Amazing the BMS has battleshort mode!
Yes, some sort 😄
HI, I find this whole subject very interesting and enjoy your insight. My problem and possible solutions - I have 4 batteries, all different makes, if I chain them together using the RS485 interfaces the BMS's do not communicate well and I get all sorts of wrong data reported to the Multiplus-II via the CAN interface. So, I am planning on replacing the BMS with JK BMS in all 4 batteries to get them compatible. The question is what JK BMS boards do I use ! Option 1 - replace all 4 with the JK BMS Inverter boards, most expensive option. Option 2 - Replace the battery BMS I will use for the CAN connection with the JK BMS Inverter board and replace the other 3 with the JK BMS (non Inverter boards), will they all talk to each other OK via the RS 485 ? Would the Peter interface boards help here ? Option 3 - replace all 4 with the JK BMS (non inverter boards) . Option 4 - replace all 4 with the JK BMS (non inverter boards) and connect together with the Peter interface boards ?
Hello, thanks for your question(s).
Option1 seems to be the cleanest and cheapest option (see below)
Option2 will not work. the inverter BMS will not communicate with the older BD series of BMS. The Peter board solution will not (yet) connect old an new JK together. A solution will be provided in the future though.
Option3: there will be no coms between the BD BMS unless you use something like the Peter boards for all of them (more expensive than Option1
Hi Andy, an you tell me what is the smallest current which can be measured? You know about the problems with seplos bms :)
Hi Andy, You indicate that your Start Balance Volt is set to 3.45V. And your Vol. Cell RVC at 3.45V And your Soc. 100% Volt at 3.449V. If you haven't fully charged your batteries for a long time. (in my case because I use ESS and the batteries charge and discharge continuously) Is it right that the batteries are not balanced? And what value could this be set to in order to be able to balance? I also use the JK-PB1A16S10P with Firmware V15.11
PCL correspond to Parallel battery setup, presumably Parallel Control Logic. I remember when I started using this (only one unit btw) I had a error ( PL Module Abnormal) and I was suggested to turn off the PCL mode to resolve it.
If you don't have Parallel setup, you can disable it.
I wonder if you could use this BMS to run in parallel with an LG, cam battery and a sung inverter?
PCL = Parallel Current Limiter?
@@OffGridGarageAustralianah, my guess is better😂?
The combined current at inverter is sum of individual current limit set at each BMS.
So, confirmed: PCL stands for Parallel Charge Limiter and the dashboard will show if the BMS runs in this mode or not... Will be in one of the next videos 😄
@@OffGridGarageAustralia Looking forward to a clear understanding when and why to use this function and in more detail.
Fantastic work Andy, can this info be seen in Victron?
Or do we wait for the Peter board for these inverter bms’s
TIA
Yeah, we need the CAN to CAN Multiboards he's currently developing. I have one here to test and can make a video to show some of its features...
@@OffGridGarageAustralia that be great Andy👌
Question.
I have an Epever Tracer 8420AN and have just ordered 16 cells EVE MB30 with the JK RESS PB2A16S20P.
Is it possible to have the bms talk to the epever charge controller?
Are there other way to make the communicate? Home assistant? Solar assistant?
Help is appreciated!
Greetings from Sweden!
Andy could you Do a safety test with the jk bms? Ovp and also a short would be great if the jk can handle all good?
We have tested OVP a few times with this BMS.
I won't do a short test though, that is far too dangerous, and I don't have the right equipment and environment to do such tests safely.
Bedankt
Thank you very much. What a great support!
So if i start from the scratch ... Do i go for seplos v3 and 4a neeey? Or would you recomend jk with active 2a balancer?
The are mounted in amys boxes with 280a eve grade b
Kiitos!
Thanks a lot, my friend. Love your support 💕
Has JK released any firmware updates beyond 15.17? Looking forward to them adding native support for additional inverters like they advertised when this model BMS was first released.
Hey Andi. Nice Video. I am using the Old JKBMS because you has shown it here. But the Inverter BMS looks interesting.
One option I would like to have. Is that the timer for the Float Mode is not Hard Konfigured. I would like that when 55.2V is reached an the Balancer is active it keeps staing on 55.2. When then the Balancer tourns off, because the cells are now equal with there Voltage. Now the Float Mode is Communicated to the Cerbo.
Yes, that is another way of doing it. However, the Victron MPPTs and chargers are all having fixed timer settings for this feature as well.
The cell deviation does not mean the cells are all absorbed. So, we would need a tail current here as well: charge to 55.2V and only go to float if balancer is off and current is below a certain threshold. But here again a pitfall: if you have clouds, the current may be very low and the BMS 'thinks' the battery is absorbed and switches to float mode prematurely.
Hence a timer is the most consistent method for charging.
There is no harm of keeping the cells on 55.2V for 1h before going to float.
I just bought some of these and got latest HW version 15. Looks like some of the connector locations have changes in position slightly on HW rev 15 but hard to be sure with the poor documentation. It looks different comparing HW v14 STEP files.
Thank Andy for having sorted out JK.
Just one question. The specs for this JK BMS is 24V or 48V i.e 8s or 16s? Does this mean that I can connect the BMS to 8s 24V now and later upgrade to 16s 48V by just changing the 'cells' setting?
Please clarrify.
Yes, correct. For an 8s battery you use only the first 9 balance wires and the very last for main positive. Later you can add another 8 batteries and connect all balance cables. You also need to change the cell count in the settings as you already said.
I have had an issue with my Inverter BMS and I don't know if I can or how to reproduce the issue. In short I had a cell undervolt during a discharge test and the BMS switched off the Discharging. I did not power cycle the BMS, but connected with the phone app and switched to emergency mode to be able to get the inverter to power up and charge the battery. After I fully charged it I noticed that the JK-ESPHome integration I use was reporting the Battery Capacity incorrectly at 161Ah instead of the 250Ah it previously reported. The JK BMS App was still showing the correct 250Ah. After some testing with ESPHome and HA I decided to set the battery capacity on the BMS to 240Ah and then back to 250Ah. This seems to have fixed the ESPHome integration's reporting of the capacity, but this also seems to have reset the cycle count and cycled Ah on the BMS to 0. Should this be possible? Can someone possibly test this?
Hi! When you set your RCV time to 1h and RFV time to 6h. This will charge the battery twice a day. Once in the morning and once in the afternoon. Or am I missing something?? Thanks!
Hey Andy.
Love the BMS except currently it doesn’t communicate to solis inverters as advertised.
JK aren’t replying to me yet so wondered if you could ask them for us?
Pylontech should work but it has a BatName-Fail error.
Thankyou for your work!
I'll pass the information on to JK. Try Whatsapp to contact them as well.
@@OffGridGarageAustralia thankyou!
Please help us understand if coulometer works in the new JK Inverter BMS. How to set it? Does it provide reliable capacity info for JK screens? Thanks for all the work you do and all info you provide
Hi Andy, greetings from Andi. Awesome vids. I am strugging to get "consumed amphours" to work in my VRM - shows only zero. Do you or someone else know the solution/answer?
Did you ever work out how to calculate SCP Delay?
Im have an issue where my 240v fridge thats run off my 2000w pure sign inverter keeps activating my scp warning. I have just fitted a 4s jk bms to my eve 105 in place of my daly bms. This 1500 default setting is the only thing i can contribute to the actavtion of the bms shutdown.
Hello Andy! Can you confirm?
JK_PB2A16S20P HW 14.XA SW 14.20 + APP V4.16.2 + PC-SW Ver2.7.0.22.
In the APP are missing: "Vol. Cell RCV", "RCV Time", "RFV Time", "Vol. Cell RFV", "Float Mode" Switch.
In the PC software I can see and set "Vol. Cell RCV", "Vol. Cell RFV", "Float Mode Switch" , but "RCV Time", "RFV Time" I can just see but not set.
What am I doing wrong?
Hello @OffGridGarageAustralia , how does the charging logic work? I've already done a few tests and can't figure it out, RCV and RFV and the time dependency. Sometimes the JKBMS regulates the inverter correctly, sometimes not. I just can't figure it out.
Thanks for Informations
And greetings from Germany
does it play well with solar assistant?
Hi Andy , I have just fitted a JK BMS to replace a PACE. . The battery is not connected to the inverter. My battery is 48v Lithium Iron Phosphate , 15 cell , 150Ah. When I open the app it shows 0.0w next to Battery Power why is that? I have set Cell OVP at 3.65 v , but if I then set Cell RCV at 3.45v it says sending failure? Having filled everything in and gone and pressed ok next to each setting I now only have one with the sending failure message, that is UTP at 5 degrees ? I would appreciate any comments on this .Thank you kindly
Thanks a lot for the video! I will be installing two of these shortly so this is very helpful. Does anybody happen to know what the small switch on the communication board is for? Does this function as on/off switch, or something else? (there is a dedicated on/off switch provided though...)
The coms boards has a reset switch. If the BMS hangs or does not respond, press the button. It may reset all settings though...
So that's what that switch is for. Thank you so much! Ich danke vielmals! @@OffGridGarageAustralia
Can this BMS be used with non-networked chargers and inverters, similar to a standard JK BMS?
I’m thinking of getting one to use by itself until I upgrade my inverter
Andy hello, I have a question, I have a deye inverter connected to communication with bms jk i man, the problem is that even though the inverter is set to first consume and then charge the battery, when communicating with jk bms it first charges the batteries from the solar panels and at the same time it draws electricity from the grid for the house. may I have it set incorrectly?? when setting the inverter to v tz. without communication with bms it works fine, greetings
Danke dir!
Kein Problem!
Ich schiebe mal ne Frage nach, die immer mal wieder in Foren auftaucht: muss man beide Anschlüsse am BMS verbinden oder reicht einer, wenn der Kabelquerschnitt ausreicht? Oder ist dann evtl der Querschnitt beim Übergang zu gering?
@@pcmoeller JK sagt, beide muessen verbunden sein, sonst wird der Strom falsch gemessen. Mache bald mal ein ein Video darueber...
@@OffGridGarageAustralia Danke dir! Freu mich drauf. Hab mein neues JK Inverter BMS mal aufgemacht (hab nur die hintere Platte wegbekommen) und da sieht es nicht so aus, als seien die beiden Anschlüsse direkt miteinander verbunden, eher so, als ob sich die FETs auf zwei Kanäle aufteilen - aber ich kenn mich da zu wenig aus um das beurteilen zu können. Hätte ne direkte Verbindung erwartet und die war nicht zu sehen.
I dont have a Battery Tester to know the AH capacity of my cells.
Can this new JK BMS automatically measure the total AH of the cells?
For AC surplus charging in a grid-tie system, would it be an option to use a "dumb" non-controllable AC-DC converter, then use the BMS's current/power limiting function to regulate so that just the amount of energy lands in the battery that would otherwise be fad back into / lost to the grid? Controllable power supplies (like MeanWell NBP, Huawei R4850G2) can be hard to come by and more expensive, esp. when you have/need the BMS anyway.
Is it possible to connect the Sofar solar inverter with this BMS?
Thank you for all Informations!
I have a Problem with my Inverter-BMS. I think the Balancer does not work correctly... I have Delta Cell 0,3V since i have this BMS.
My old JK-BMS with HELTEC-Balancer have Delta Cell ~0.02V.
I hope my connections are right. The App shows correct Voltage... Did you have a Wiring-Plan for JK-Inverter-BMS JK-PB2A16S15P ?
Oh... I have found my Problem. Batterie are 100% and my EPEver has loaded over 56V. It was to much and my voltage going crazy.
6:14 If 3.650V is the value of this setting, then, what if the JK voltage calibration is no so good (about 10 or 20mV of error, for example) and/or the voltage of one cell is bigger than 3.650V before is detected by BMS? Could it damage that cell?
The voltage calibration of the JK is on battery level. So if the overall battery voltage is off by 0.2V and we have a 16s battery, accuracy for the cell voltage could be impacted by 12mV. I wouldn't be too concerned about 10 or 20mV.
@@OffGridGarageAustralia Sorry... I meant 10-20mV per cell calibration error. So... 0.160-0.320V for the whole battery. If you reach 3.66 or 3.67 for a cell, could it be damaged? how much time can be at those voltages before damaging them?
Hi Andy, your favorite B2A8S20P 200A BMS got a 300 A version: B2A8S30P which is flawed. In adition to some strange status parameters, a "C" terminal and a parallel connector raise some questions. But the BMS has a real problem: it gets stuck after an UVP swich off. After reaching the UVPR cell voltage, the discharge MOSFET remains off with an error message...
I bought 2 modules, both are flawed. Email to Jikong remains unanswered.
Can you help?
Servus aus Bayern, Hans
Thanks. Isn't that the one which comes with the contactor? I know JK also make some 500A and 1000A BMS which need one or two contactors. I never had one to test and review...
It's Chinese New Year celebrations atm, so try again in March to contact them here: www.jkbms.net/contact-us
@@OffGridGarageAustralia I have used the Relay versions.....but I am talking about the B2A8S30P all MOSFET version. The problem I described above still exists, I have bought more than 10 units over the last months. I have tried to contact Jikong vie Email, Whatsapp, also I tried to reach Nami. Pleas can you address this issue via your link to Jikong? Beste Grüße vom Tegernsee
hello, is it possible to use this new-style BMS on electric bicycles
Andy hey! Now I finally have a Victron 250|100 MPPT. It only starts battery charging when the panel voltage is battery voltage + 5 volts. After that, it is sufficient that the panel voltage is the battery voltage + 1 volt.
So howabout if you do an experiment where you give a voltage increase parallel with the panel voltage such that the MPPT controller notices that the PV is high enough to start charging the battery. And when you have given the MPPT controller this necessary wake-up call, you turn off the auxiliary power source. So you only use it for a short time in the morning to get the Victron rolling earlier than it would start on its normally way.
I would say, this makes no difference in energy production. The gain will be so very small, that this makes not much sense. When the MPPTs start, there is literally no power coming in, so starting them even earlier... no power generation.
@@OffGridGarageAustralia Sure.
I just built a 48v battery using this bms but it is outputting 36v at the terminals. It is 16s and the cells are fully charged and there are no faults. What is going on??
Any idea why the "Vol Cell RCV", "Vol Cell RFV" are not listed in the mobile Android app (last version) but are listed in de Windows app??
BMS just updated to v15.17 firmware, still those values are only in windows app.
What mobile app version have you got?
@@OffGridGarageAustralia 4.20.0.
Google PlayStore says that its the most recent one. 🫣
@@OffGridGarageAustralia the version from your dropbox account. Where the playstore indicates its 4.20.0.
PCL is to turn on or off the Parallel function. ie stop the master talking to the slave units. I had a lot of issues with this and in the 14.13 firmware it kept dropping the slave and Helen told me about this function, but couldn't tell me why it would not work properly. I havnt flashed with the new yet, so hope it works in the 14.9
I thought PCL = Parallel Current Limiter?
Andy, Is it possible to save configuration profiles to a file and share them?
No
No, you have to take screenshots. I have put a feature request in with JK...
hello handy today I installed the jkxxxPB 2A150A I turned on inverter and it charged well my 280ah 16s ,up to 54.4v then I discharged some consumption and then I don't understand what happened the charge went OFF as if the bms froze at that cell voltage 3.35 , and there was no way to change the situation, but inverter still charged the battery up to 55.4 but in the display and in the app the voltage that gave me the BMS always that 3.35 even if the battery was at 55.4 I don't know how to get out of it ! If you have mail I would send you the photos of the config of the BMS copied from your grazie ❤❤❤
Good day how Its coonecting for 14S ? 15 adn 16S not coonecting or coonecting all 14+15+16paralel?
Bms coonecting to Deye 5kw
Connect can or 485 , how Its ideal protocol? Phylontech?
15 and 16 not connected and 17 is connected with 14 together to battery positive.
Protocol needs to be set accordingly to your inverter. There is no ideal protocol, it needs to match...
Hello Andy. Yesterday I connected my Solis RAI-3K-48ES-5G to my battery with the JK-PB1A16S15P. The configuration is like this:
Solis = PYLON battery selected.
JKBMS = CAN protocol (2) Pylontech.
Unfortunately, an alarm comes straight away and says:
BatName Fail ALERT
So, JKBMS doesn't send a name.
I've now looked and found out that the manufacturing name must be in the protocol under the address (CAN ID: 0x35E).
Can you tell the JK people???
Thanks Andy . Gruß aus Deutschland.
I have this error on my JK Bms
"PL Module Abnormal"
Do you know how to fix this? Thank you.
Colles Video :-) Vielen lieben Dank
Eine gute Frage, was ist besser?
Das neue JK-BMS oder das alte JK-BMS mit dem Peter board?
Bei mir aktuell sind die alten JK-BMS verbaut
Schöne Grüsse aus Österreich vom Bodensee
Leave the old JKs ins place if everything works. There is no need to upgrade. The Peter boards are quite expensive too and only if you really need the communication or want full Home Assistant integration, they make kind of sense...
Rept lithium phosphate cell is good or not
I want your suggestion plz
I recently installed this bms and a lot of these settings aren't present for me???
PCL is parallel current limiter it will work when two bms are communicating in parallel I think jk bms has 10amp as parallel current limiter
@aftabmaqsood thanks for the clarification. Could you please give us a few more details? When does it limit the current? ALWAYS or just at the beginning? Is it for charge or discharge current?
It will limit the current if you hit OCP.