Don't stop starting the videos looking outside. The few you haven't, I was like hey, what's the weather!?!?! I mean you kinda have a solar power channel so it makes sense to start with the sky!
I really appreciate your video on programming this bms. Very helpful. I've built my own 'Frankenstein' battery a bit over a year ago using another of JK's bms'. And when I connect to another whole house power station as an auxiliary the bms disconnects on the inrush current flow upon start up. If I connect it in parallel to the power station's battery (which is an option as there are 2 Anderson ports) the inrush is overcome and it works beautifully. But if I only use my own battery build as the sole source of battery the power station shuts down due to the inrush issue. I saw in your video the newer bms by JK (inverter bms) has capability to determine whether it is a short or inverter power up amp draw and am intrigued enough to place an order for the newer inverter bms, which is on the way. I had to use Ali Express as that is the only source I could locate for a single unit. Its a bit disconcerting to see this video with CAN issues and am wondering if the quality control at JK is up to snuff. Time will tell. Thanks again.
Hi Andy. In terms of the aggregated battery capacity. I think the best calculation would be for JK to use the weighted average of the battery packs. If the battery packs are a different capacity, then their SOC could indeed be different, but their voltages the same as they are connected in parallel. I think using the weighted average calculation is the most accurate for connecting different capacity batteries in parallel.
Yup, definitely want to weigh SoC based on battery size for averaging purposes. Or even better: just calculate overall SoC based on the sum of available kWh divided by total storage.
Another Great Video Andy. You have verified my own finding. I have 2 of the 200A JK units. It only shows the Soc of the master to Victron. But I have over time noticed three issues.... 1. The PC software Suck Donkey B.... it doesnt show the correct battery into as you have found and you also cant change the Uart / Can protocol from the PC. Thanks goodness for the BT app. 2. A power cycle of the BMS looses all settings and you need to start over.. In the last video one of the last things you did after setting up the BMS in the Jaki was to power it off, hence this time all your capacity and voltages are out. 3. I have found the parallel to be a bit flaky. I have had several instances over the course of the past 2 weeks where the slave BMS drops off and Vic only shows the fata from the master. On the main screen of the BMS their is a value bottom right PCL:OFF. Helen Tells me this should be ON for parallel communications link, but cant tell me how to get it to turn on. There is a slide switch to disable it but nothing to turn it on.....Crickets since I reported this back. I have found one other issue with the RCV and Float voltage. When my batteries got to the RCV and then changed to the float value the Victron through up an over voltage alarm from the BMS and triggered the Freq to 53hz so the Fronius Solar wouldn't charge anymore. it held this well below the 53v I had set and I eventually intervened and turned off the float swicth in the BMS and all was good again,. Over all I am happy and I am confident enough that JK will sort out the issues in time, Hopefully issue 2 first, 3 second, then 1. As always enjoy the SPATS and xmas looking forward to some excellent vids in 2024. Ty H.
@tyweb9264 So you were told that the PCL (Parallel Communications Link) should be on when paralleling batteries? I wish there was instructions somewhere. I have 4 of the new JK BMS 200a with the version 15. Who is Helen?
@@Braebyrn Hi Sorry for the late reply. Helen is the JKBMS lady I have been talking with on the support line. Yes I have upgraded my firmware to 14.20 a couple of days agao, and whilst the PCL is still showing as off, they seem to be working as a pair just fine. But I havnt been able to monitor it 100%
Andy I love getting the weather in amps outside at the begining of the the video. I really laughed the first few times I saw that! It's perfect for a vid about solar energy!!!!!!
Hello Andy, Dear I already mentioned to you that the settings are resetting to default after restarting the bms whenever you turn off the bms it will reset unfortunately And besides the batteries doesnt balance with each other for whatever reason You are doing a great job here much appreciated and thanks a lot for sharing everything with us
Awesome job and always appreciate the diligence you provide. My question is, how many of these BMS’s can be paralleled? I’ve have six DIY 16s LiFePo4 packs. Does each additional BMS paralleled RS485 back to the master? Or daisy chain slave to slave back to master?
Hi Andy & community and thanks for this long waited test. I have complete new setup build with two (2) JK-PB2A16S-20P, (200A, with 2A balancer). Ordered them also among first ones when those became available. Both of them seems to be working via bluetooth OK (8S config). Both of them stand on V14.03 software version while hardware appear to be V14.XA. Bought also RS485 (USB to RJ45) module for the firmware updates. Managed to install it OK to my laptop. At least I think so. The problem is that there is no way I can connect these BMS's to laptop through latest JK PC software, it just simply dont bring anything on the screen even the module light is flashing, so likely "something" is happening. COM port should be OK as well as well as device ID. So I have now a bit questionmark if the issue is on the RS485 module (first time ever I use that) or do I have two similar faulty JK-PB2A16S-20P's as you Andy seems to also have. Honestly I have no idea what to do next, obviously I cannot stay on 14.03 version. Is there actually anybody who could confirm success on updating software for 200A, 2A version? UART1 protocol No. = 0 (if trying to change as 1, it will give "sending failure" message on bluetooth app.) UART2 Protocol No. = 1 CAN Protocol No. = 0 Any ideas?
I found one of my BMSs is still virgin at V14.03. I will update it with version by version to see from which version it looses its settings when switched off.
Hi Andy! Thanks for all your videos, I discovered your channel recently and I'm learning a lot thanks to you! I have a project to assemble two 4S batteries that I would like to put in parallel. I was wondering if it was possible to put two 4S compatible JKBMS in parallel? Or are there other brands of 4S BMS that can be paralleled?
I was looking at cases that use the JBD bms and JBD seems to using the same communications board as the JK bms. However, on the JBD case the communications board is rotated 180 degrees (upside down from how Pace mounts it). If JK is copying that, then I can see why setting location 1 is set by moving the right switch on that DIP switch instead of the left switch.
Great video, it was very helpful for me. The new JK BMS has the ability to turn on heating/cooling of the batteries when needed. It would be interesting to make a video on this topic. I know it's very hot in your place right now, but I think it would be useful for all the other DIY enthusiasts on the other side of the equator.
Wow, JK should be absolutely amazed with all bugs you are finding within a whim. Take a breath, calibrate a SPAT and let's hope JK watches (and understand all "not good"'s. Frohe Weinachten und ein guten rutsch im neuen jahr 🎉
Hi, I love your videos. They are great and very helpful. Do you have any information whether this JK invertor BMS can co-work with Victron Multiplus correctly with multiple parallel battery banks with own BMS ?
Heya, nice test again thanks. still in the market for 3 BMS's hope they will upgrade the software for parralleling batteries soon. can't wait for the next test.
merry christmas andy .. a funny fact is that 0.7 amps for the 200 amp bms wont get detected as charge and i thought the funny fact that 0.7 amps for almost 300 amp bank wont even charge it!!! i think it can just co exist as a tiny current !!! wishes for a happy new year too no point of waiting 5 days
Hi Andy,and thanks again for this video..Andy i just want ask you (and i'm not remenber if you said it in your previous video?) the last version of the software with new setting added,match only with the "inverter BMS" or can match also with the previous BMS model (like the black one) Thanks.
super video! the paralel function is the first time that I see it in action. it really is the best function of the new jk bms. they could increase the equalization current on the bms so I don't have to use the extra capacitor ones. even thought the new feature with parallel settins is working and is a great achivement...I think I'll stick with the old JKs thank you for the videos. great work
😢😂 hi andy a little clarification on the cerbo which takes into account the discharge and charge settings of the master and slave!!! is necessary! take the test! discharge at 80a on the master and slave yes it will display 160a but it only takes information from the master! if you discharge 120a you will see that the cerbo will create a significant discharge alarm because for him it will be 80a and no!!! 160a!!! a+
Well done Andy. I will buy 2 JK inverter BMS now. BTW, I have two battery's in parallel in different capacity and they are always in the same soc. No problem here. One with JK-BMS and one with qucc bms.
Great! I made the same observation with all my batteries, regardless what capacity they have, they are very close together and sync to 100% when fully charged.
@@OffGridGarageAustralia …but what‘s the explanation for that? Seems like then currents are proportional to the capacity - but why? 🙂 Functionality of bms, or some physics?
@@jlegen Because internal resistance changes based on state of charge and capacity. If you have a 100Ah and 200Ah pack, the internal resistance of the 200Ah pack is less than the 100Ah pack, therefor the 200Ah pack supplies more current than the 100Ah pack when both are in parallel. They keep each other in balance.
It does make sense that the Master always needs to be at address 0, so that any other(!) address signals to the relevant BMS-ses that they are Slaves & need to expect a Master. When using PC software compared to Bluetooth, I also noticed similar issues that communication is slow(er) and discrepancies on the PC compared to BT. I guess there are still some rough edges on the software, hopefully it can be fixed soon. Wishing you happy holidays and a fully charged 2024!
PS: it is "normal" that when you chance the battery-type, the battery-capacity is "reset". I believe it is to protect the BMS in case you choosen the incorrect battery-type?
If i have two batteries and two JK 200a BMS connected to one inverter, in master and slave configuration - Can I draw up to 400 amps from the batteries in total? Or, is it limited to the max amps of the master bms, i.e. 200 amps total from both batteries?
Loved the deer, mate. I heard rain coming south from my mate on the gold fields north of you. Room finish, but having problems getting the right guys to connect my system to my house. Long story not here.
Can I connect two 24v batteries in series to get 48v. I have 2 batteries made of 8s EVE 304ah using two JK 4s8s 200amp BMS. I wish I had bought 8s20s version. Now connected as parallel as I have 24v inverter. However now I got solis hybrid inverter which accepts 48v battery. Moreover, how can I get these two JK BMS communicate with each other and the inverter.
Hi Andy, Thanks for your very informative videos. I need a Bms capable of 400a max. Would i be able to achieve this by using 2x JK 200a BMS. I have 2 6s packs so could run 1 bms per pack and draw 400a right?
Hi Andy for your BMS problem block on request to JK a Provision Code to reinject it and it should go after your test it is not push because if you leave the 2 bms in // what days you will realize who sinceronizes more in upload and which loads the same thing it deregles and come back to factory alone tell me if you have seen that !!!! THANKS😂
You need a new (temporarily) sign : JK's Headquarter of Quality Control It feels like they have not really done their job, the development of the windows software and the quality control that builds the releases. it seems like you touch a topic and a bug jumps out of the screen into your focus / eyes Luckily it is more or less fixable and nothing burnt into a rom which would require a chip exchange, just software or maybe firmware. I still hope that this will be our next BMS cause I have more or less given up that SEPLOS will get their BMS right, which will mean I will have to add a Neey active balancer sooner or later depending on how long the new grade A cells stay so close together with a deviation of 0,005V - huge difference to the previous grade B lasered cells from EVE. in 1 year we should have a bigger deviation after 200 to 240 charge cycles. And I can not wait to see the whole system with the peter board working and the progress of the general DIY battery build market cause you are pushing on everyone hard to get things done and deliver running hard- and software that should work flawlessly. Quite a long journey you had embarked to. The whole market of DIY builts and blueprints is shifting and more and more are pointing or linking to your channel. Hats off! Hopefully SEPLOS is listening and watching how far ahead the competition has pushed and that they finally neeed to catch up, not only working on the hardware improvement, but also on the whole system performance and issues. I can not really recommend the SEPLOS BMS anymore even though 1 year ago JK had nothing which came close to an inverter BMS (cause I had bought back then their CANBUS edition which was not capable at all, I mean running with a growatt inverter for example). And now it has flipped, JK far ahead of SEPLOS in such a short time and I bet SEPLOS is falling even more behind considering the progress JK has achieved since summer.
My idea of a master is that, beyond capacity and maybe a few other settings, all the slave BMS would have the same settings. Maybe there's a switch to have a slave follow the master BMS? Right now it looks like just a way to group a bunch of BMS's together and aggregate the data for your inverter.
So Andy connected jk in paralel , did jk swap. I have a question for everyone. Can we sonnect jk in series to be used as replacement for server rack HV battery? Acctualy which bms is in in all thise HV connected server racks?
Its probably just picking out the wrong field from the data packet on that "100AH" display on the PC. I also like how the voltage gauge goes all the way to 200V and the needle obscures the value display.
@@BobDevV The Victron will have a maximum amperage setting separate from all the BMS monitoring as well. Obviously that would be set to what the wiring, breakers, fusing, and devices can actually handle regardless of what the batteries themselves can handle. You are making an incorrect assumption about the shunt. If you look at Victron's product line-up, their smart shunts are 500A, 1000A, or 2000A. The smallest offering Victron has is the 500A shunt. Most people will be limited by the wiring they choose, not the shunt. In anycase, one always has breakers and fusing for the capabilities of the wiring, including the shunts. Whatever the worst-case winds up being, if you make a configuration mistake, you blow a fuse or trip a breaker. Nothing actually fries. For example, I have three batteries in parallel for 200Ah @ 51.2V, capable of discharging or charging 200A continuously and bursting for 400A. Great. But my cabling is 2 AWG so the actual maximum amperage is only 115A. My fusing is 100A and I have an 80A master breaker because my current system doesn't have the ability to charge or discharge more than 60A anyway. If I had a setup where the Victrons were under a centralized control system, I would thus set the global amperage limit to 60A. -Matt
@@OffGridGarageAustralia Is it advisable to parallel two lifepo4 battery packs with different BMS brands without linking the RS485 ports? just to increase the capacity of my ESS.
hi, there i have jk bms and i was trying to connect via usb on desktop?laptop , did`t recive any data from bms . There is any way how i can make thi to work , any advice will be much apricieted .Thanks
I think this could be important: Charging Settings should copy to slaves in case of the Master fails. (If the lowest ID becomes the master then… or only 0 is a master? Which would be a single point of failure) If the 200A version can’t see less than 0.8A the victron system still knows what it pulls, correct ? So SoC might be not correct but maybe better that shared current is not activated with this BMS
Hi Andy I have a quick question for you, my system has been built up over a few years now I have inverters to charge batteries and charge controllers of different makes none of which are victron would you bother to communicate with the inverters to charge or just set all the charge voltages the same as I have and call it done
Hi, i have Three JK-PB2A16S15P (v14.19) in parallel, but on the Cerbo I see that they keep losing the connection to each other, sometimes only one, two or all three are displayed.
Ah and Andy - coud you please test the calibration like calibrating at 10A and then going up to 30A for example? Also on dicharging please! Have a wonderful Weihnachten erstmal! VG Hannes
is there a good source for this bms? Since the offical Jk-Store on Aliexpress does not ship to germany. Some other shops seem to have the bms in stock an shipp to germany for a even cheaper price, but is that legit?
Good morning mister. Maybe you can help me with my issue. I have two batteries one deye rwm6.1 and seccond which I made is lifepo4 280Ah 16s. I TSH which I made myself I use jk BMS pb2a16s20p. Maybe you know how to make connectio between the batteries and my inverter deye 12kW hybrid? I'm be very appropriate. Thx.
It's really cool that you do the tests... Comparison.. and all but I prefer a much more simple approach. The complicated computer communication is just way to much effort
What is this green port written dct on communication plate? Is it dry contacts? If it is then what is itsfunctiolity of it? Does it really work in this bms? Kinly make video on its functions.
Hi Andy, Good video thank you. Mine has version15:5 and when I do exactly as you show and I select the software 15:10 for the JKPB2A-15S-15P which of course is what mine is, it just says "Device identify is not same as connected device!?? In fact I tried all four of the versions in case there was a different type in this box, same result with all. I have to update the firmware as 15:5 loses all the settings when you switch it off, has anyone the same problem and if so is there an answer please?
Amperage resolutions can push the ADC. +/-250A = 500A range. @ 8 bits it would be 1.9A resolution. @ 10 bits it would be 0.49A resolution. And @ 12 bits it would be 0.12A resolution. 500 / 256.0 (8 bit), 500 / 1024.0 (10 bit), and 500 / 4096.0 (12 bit).
They are other ways like op-amps circiuts with variable gain, or ready to go 16bit integrated ic for shunt measurements, you simply puts external shunt and it works , ect,etc someone just did not make his best when doing this
@@tomaszszczepaniak2101 If you want to double the build cost and calibrate a variable gain op-amp circuit, sure. Otherwise, no. 100% of designers will choose "no" for a product like this. Seriously. These types of products will almost universally use the ADC built into the micro-controller rather than a discrete ADC chip. 8 and 10 bits is easy. 12 bits exists but is less common. At some point getting higher accuracy cheaply requires switching from SAR to Sigma-delta. Things can get messy very quickly at higher ADC resolutions. Going higher than 12 bits, fully calibrated, generally adds too much expense for a product like this. Same thing for the op-amps. A simple level-shifter and fixed-ratio amplifier is just a few parts. Like 5 or 6. Two fixed-ratio channels would run 10-12 parts. The instant you try to get more fancy than that you will end up with 20 parts and still not be done with the design. Doing more than the basics quickly makes a device like this too expensive to be able to compete in the market. -Matt
Variable gain op amp is op amp with like 3 resistor and one connection to mcu processor its less than 0.1$ . They should do it , becouse soc is roc stable when 0.3A load exist
Generaly i understand your point of view and as person who work in embeded i understand what you say and why its like this, but as a customer i will complain , it don't work good enought for 200$ bms ;)
@@tomaszszczepaniak2101 You can't control the impedence of the micro-controller's I/O pin when trying to pull-down to create the resistor tree, plus there is leakage on the resistors that are "off", plus the microcontroller's output won't pull all the way down to ground. So at a minimum you would need N-channel FETs hanging off the resistors and then control the FETs from the microcontroller. As I said, calibration becomes a problem. Actually not just calibration, but also temperature compensation. They both become huge problems. I guess level shifting isn't required for a shunt since the battery cabling for the shunt is ground-referenced. But since current has to be measured in both directions, you would need two op-amp circuits at a minimum (one for each direction) to avoid having to generate a negative supply. -Matt
Hello Andy, thanks for the great videos about the new JK. Will this JK-BMS also work with RS485, did anyone test this? I don't want to install a CANHat on my RasPi if not necessary.
Hallo Andy Merry Christmas für dich und deine Familie und schöne Feiertage vielen Dank für deine tollen Beiträge Videos finde ich immer sehr interessant ich habe jetzt einiges sehr gut davon gebrauchen können und es hat mir sehr geholfen. Viele Grüße Wolfgang
I have 4 JK BMS's connected in parallel but can only see one of them (in the PC parallel mode). JK tells me I have to physically change the ethernet cable to the other BMS's to see them in the software, "really JK?". By the way I've outfitted the BMS's to the EEL box's made to accommodate the new JK inverter BMS.
you have to set the switches of the master, slave 1 at the dip switches. then connect to the right battery number according to the dip switch u set in the comm board of each jk bms
@@raffy323232 I do not get your answer completly. I have to set the number of batteries I have at each battery using the DIP switches? I thought that you set the ID. Because that is also reflected in the name in the App and in the settings you see that, too. But I am still struggling with paralleling two batteries. I have two JK BMS in version 15.17. I have a LAN cable going from one rs485-2 two port to the rs485-2 of the other bms and cannot see the 2nd bms in the software. If I connect to rs485-2 with the PC I only see the main battery or if I connect to rs485-1 I do not see anything. May it be that my protocol is wrong?
Hello Andy great seeing your videos. Keep looking at the sky. Question, have you ever heard of a 16s cells going to zero volts. All cells suddenly are at zero and after 3 to 5 hours later it goes to normal. Next day the same thing happens. Its a daly 100A. I've had this to over 1 year now. Thanks
Due to the wonkyness of JK I've had my battery builds on hold for over a year trying to figure out the issues with the various JK bms' I've purchased/installed. I tried to figure the issue from a logical standpoint and am still conflicted. The programmers at JK use some logic I'm not familiar with. And due to that I've been waiting for them or someone at another manufacturer to come up with a bms that doesn't use 'pretzel-logic'. It's very disheartening as a one off type buyer to continue to have to replace components and wait for deliveries. I often wonder how the makers of power stations, cope with this. Probably pallets of returns is my guess. I realize these are complex devices, but not enough quality control being used?*!
Hi Andy, another big JK software problem in parallel BMS: As you showed us in VenusOS/Cerbo under BMS/Details the number of BMS / batterypack is missing. As you said, this is NOT GOOD. But that's only the tip of the iceberg. My experiments show me that only voltages and temperatures of BMS #0 (the master with the CAN uplink) are transferred to Victron, no values from any other JK BMS (slaves) 😧 That's not bad, that's ugly. If cell voltages or temperatures of the other BMS / battery packs are running out of the secure range, Victron doesn't get the information, cannot for example ramp down the MPPT current. Can you cross check my results and if you confirm that, report this big bug to JK. Thank you for your great work 👍🍻 PS: I would be happy, if I made a mistake.
Ich schaue gerne deine Videos, obwohl sie so ungewöhlich lang sind 😄Dein Dialekt kommt mir bekannt vor. Wo kommst du den ursprünglich her? gruß Martin aus dem Saarland
Dear Andy, this is the sixth time I am trying to post questions on asking why I can't email Vincent before my posts were automatically removed by youtube. The email at jkbms site is invalid, I keep getting "email address not found" whenever I tried to send it to vincent email there
II think I seen one of the battery 100% SOC at 3.1V is why it showed 100% every time you click in battery type it resets a lot of settings. I found that out way back when I was first configuring mine.
Im looking for an nice housing/enclosrue that fits 16x 280Ah cells and this new JK BMS. Anyone experiences and/or recommendations? I'm not really looking for a box including BMS, as that is just waste of money.
You leave the garage door open but there are no bugs flying around the lights or mosquitos. Also it’s hot, but you don’t sweat much, your garage only has fans? Are you an AI?
I managed to connect to the rj12 connector with rs232 and 'use' the desktop app. Of course, the bms (100A/1A balance) has old firmware, so I couldn't see anything other than some zeroed voltage/current gauges. Tried to update firmware, but it said the firmware didn't match the device. "Device identity is not same to connected device!"
OK, so I managed to update the firmware to .14. I realized that my rs485 adapter cable only had wires running to pins 4 and 5 on the rj45 connector, and the jk pinout description says pins 1,2 OR pins 7,8 are the rs485 A1 and B1. So I cut the cable and twisted on the brown and whitebrown wires from a cut end of a spare cat5 sitting around. Looking on the back of the jk connector board, it looks like there are only traces coming from pins 7 and 8, so I can't see 1 and 2 working. I measured the V coming out of the two wires from the usb adapter, and got ~3.5V when the leads were held with a certain polarity. I figured this would identify which one was the +, which I thought was the rs485B, but this didn't work. When I reversed the connection to pins 7,8, the brown/brownwhite on the rj45, I got things to work. I will mention that things did not work all at once - it seemed like I could see the overall cell voltage right away, but the rest of the desktop app showing me the controls tab took a minute or more to show up, and all of this was needed before I could actually update the firmware. I think I might have also needed to reboot the bms while the desktop app was running - not sure. A note to all trying to see anything in the desktop app for updating firmware - check the pinout of your adapter cable and don't be too quick to change connections around - things might take some time to load up. BTW I did have to set dipswitch 1 to ON. The led built into the rs485 adapter blinked a LOT brighter once I did this AND had made the polarity change. So all good. Deserve a dram. Merry xmas everybody!
Hello Andy, I have found one issue with the jk-bms. Every time I use the powerbutton to switch the bms off it lost all parameter who i have given them. And this are the answer off Hakinzor woh I by my bms. „Hello, this is a normal phenomenon, You can use sleep mode in the app so that it won't reset your parameters. You can wake up the BMS on the next use.“ For me it dos not work. Will this have others here at that channel? Greetings
Andy tests 2 BMS in // in full and complete recharge for a few days, you will see who there is big communication problem to give between the 2 BMS !!!! 😁🤣
The total SOC for a system using parallel batteries should use sum(remaining capacity of each) divided by sum(maximum capacities of each) & display as percentage. Averaging reported SOC% of a system using very different capacities capacities would be misleading. What to do when discharge has been turned off for a battery, is it still included for system SOC?
The new FW 14.15 fixes the SOC calculation. Not sure of it still calculates SOC correctly if one BMS has dc turned off. We never tested such things in any BMS. I would expect SOC is still correct as for this battery SOC remains constant.
Thank you for doing all these tests. In a few days I will receive the hardware to do the upgrade. Then I'll be able to install a second BMS Jk on the second battery. It's reassuring to know that there are few bugs to correct. And I didn't know that BMS were limited in accuracy. 0.7a is still a lot I think. Does that mean that if I use only 0.4a 24 hours a day, for example, it won't detect any changes? Or just that it can't see it but counts it by deducting the overall voltage? I'm a bit confused about this. Thanks again Andy. 😊
For lifepo4 there is no chance to calculate the SoC based on the voltage as long as the voltage is not close to a fully charged or almost empty state. Even with better accuracy the SoC reset is needed from time to time by charging to 100%.
It would be great to have one tab or one window with multiple views of all batteries connected in parallel, even if there are 2 or 15 of them. (The Sun Fun Kits V5 BMS app has a very nicely done multiple view in one window of their 12V batteries connected in parallel or series). It would also be great to be able to set up a Master BMS and simply have the possibility to propagate all the settings for all batteries connected in parallel at the one click of a Propagate BMS Settings button.
I had the same problem with jk bms when it got bricked, but fortunately resolved it. You need to keep pressed power button, press reset button (blue). It may hard reset the bms, if no then do the same with buttons and after that update the firmware (keep pressed power button during update)
@@OffGridGarageAustralia 1. Connect the cable, open PC software, select right address and press connect, it will show zeros 2. Select firmware file, but be carefull and select right file for your bms, press force update and enter 53122019 (If does not fit then request a new one from jk) 3. Turn off the bms, just reconnect red wire 5. Then you need to keep pressed the power button whole process and release after update. Press and keep pressed power button, press and release reset button and press update in the PC software.
Don't stop starting the videos looking outside. The few you haven't, I was like hey, what's the weather!?!?! I mean you kinda have a solar power channel so it makes sense to start with the sky!
Pull up the app and look how much Watt the panels generates kinda same nah
@@Bitcoinsahbi huh?
I really appreciate your video on programming this bms. Very helpful. I've built my own 'Frankenstein' battery a bit over a year ago using another of JK's bms'. And when I connect to another whole house power station as an auxiliary the bms disconnects on the inrush current flow upon start up. If I connect it in parallel to the power station's battery (which is an option as there are 2 Anderson ports) the inrush is overcome and it works beautifully. But if I only use my own battery build as the sole source of battery the power station shuts down due to the inrush issue. I saw in your video the newer bms by JK (inverter bms) has capability to determine whether it is a short or inverter power up amp draw and am intrigued enough to place an order for the newer inverter bms, which is on the way. I had to use Ali Express as that is the only source I could locate for a single unit.
Its a bit disconcerting to see this video with CAN issues and am wondering if the quality control at JK is up to snuff. Time will tell. Thanks again.
Hi Andy. In terms of the aggregated battery capacity. I think the best calculation would be for JK to use the weighted average of the battery packs.
If the battery packs are a different capacity, then their SOC could indeed be different, but their voltages the same as they are connected in parallel.
I think using the weighted average calculation is the most accurate for connecting different capacity batteries in parallel.
Agreed
Yup, definitely want to weigh SoC based on battery size for averaging purposes. Or even better: just calculate overall SoC based on the sum of available kWh divided by total storage.
Another Great Video Andy. You have verified my own finding. I have 2 of the 200A JK units. It only shows the Soc of the master to Victron. But I have over time noticed three issues.... 1. The PC software Suck Donkey B.... it doesnt show the correct battery into as you have found and you also cant change the Uart / Can protocol from the PC. Thanks goodness for the BT app.
2. A power cycle of the BMS looses all settings and you need to start over.. In the last video one of the last things you did after setting up the BMS in the Jaki was to power it off, hence this time all your capacity and voltages are out.
3. I have found the parallel to be a bit flaky. I have had several instances over the course of the past 2 weeks where the slave BMS drops off and Vic only shows the fata from the master. On the main screen of the BMS their is a value bottom right PCL:OFF. Helen Tells me this should be ON for parallel communications link, but cant tell me how to get it to turn on. There is a slide switch to disable it but nothing to turn it on.....Crickets since I reported this back.
I have found one other issue with the RCV and Float voltage. When my batteries got to the RCV and then changed to the float value the Victron through up an over voltage alarm from the BMS and triggered the Freq to 53hz so the Fronius Solar wouldn't charge anymore. it held this well below the 53v I had set and I eventually intervened and turned off the float swicth in the BMS and all was good again,.
Over all I am happy and I am confident enough that JK will sort out the issues in time, Hopefully issue 2 first, 3 second, then 1.
As always enjoy the SPATS and xmas looking forward to some excellent vids in 2024. Ty H.
Exactly the same what I noticed with the lost settings. On the initial V14.03 firmware it was fine.
@tyweb9264 So you were told that the PCL (Parallel Communications Link) should be on when paralleling batteries? I wish there was instructions somewhere. I have 4 of the new JK BMS 200a with the version 15. Who is Helen?
@@Braebyrn Hi Sorry for the late reply. Helen is the JKBMS lady I have been talking with on the support line. Yes I have upgraded my firmware to 14.20 a couple of days agao, and whilst the PCL is still showing as off, they seem to be working as a pair just fine. But I havnt been able to monitor it 100%
Andy I love getting the weather in amps outside at the begining of the the video. I really laughed the first few times I saw that! It's perfect for a vid about solar energy!!!!!!
Hello Andy,
Dear I already mentioned to you that the settings are resetting to default after restarting the bms whenever you turn off the bms it will reset unfortunately
And besides the batteries doesnt balance with each other for whatever reason
You are doing a great job here much appreciated and thanks a lot for sharing everything with us
Forget to tell you about the bricked BMS now welcome to the team I already got one
Awesome job and always appreciate the diligence you provide. My question is, how many of these BMS’s can be paralleled? I’ve have six DIY 16s LiFePo4 packs.
Does each additional BMS paralleled RS485 back to the master? Or daisy chain slave to slave back to master?
Hi Andy & community and thanks for this long waited test. I have complete new setup build with two (2) JK-PB2A16S-20P, (200A, with 2A balancer). Ordered them also among first ones when those became available. Both of them seems to be working via bluetooth OK (8S config). Both of them stand on V14.03 software version while hardware appear to be V14.XA.
Bought also RS485 (USB to RJ45) module for the firmware updates. Managed to install it OK to my laptop. At least I think so.
The problem is that there is no way I can connect these BMS's to laptop through latest JK PC software, it just simply dont bring anything on the screen even the module light is flashing, so likely "something" is happening. COM port should be OK as well as well as device ID. So I have now a bit questionmark if the issue is on the RS485 module (first time ever I use that) or do I have two similar faulty JK-PB2A16S-20P's as you Andy seems to also have. Honestly I have no idea what to do next, obviously I cannot stay on 14.03 version.
Is there actually anybody who could confirm success on updating software for 200A, 2A version?
UART1 protocol No. = 0 (if trying to change as 1, it will give "sending failure" message on bluetooth app.)
UART2 Protocol No. = 1
CAN Protocol No. = 0
Any ideas?
I found one of my BMSs is still virgin at V14.03. I will update it with version by version to see from which version it looses its settings when switched off.
Hi Andy! Thanks for all your videos, I discovered your channel recently and I'm learning a lot thanks to you! I have a project to assemble two 4S batteries that I would like to put in parallel. I was wondering if it was possible to put two 4S compatible JKBMS in parallel? Or are there other brands of 4S BMS that can be paralleled?
I was looking at cases that use the JBD bms and JBD seems to using the same communications board as the JK bms. However, on the JBD case the communications board is rotated 180 degrees (upside down from how Pace mounts it). If JK is copying that, then I can see why setting location 1 is set by moving the right switch on that DIP switch instead of the left switch.
Hallo tolles Video , habe eine Frage , welches Kabel Typ A ? Hast du vom jk bms zum cerbo gx genommen liebe Grüße aus Rot am See Andi Schindler
Always the finger in the wounds...perfect Andy, you will make them make the perfect BMS eventually ;)
Great video, it was very helpful for me. The new JK BMS has the ability to turn on heating/cooling of the batteries when needed. It would be interesting to make a video on this topic. I know it's very hot in your place right now, but I think it would be useful for all the other DIY enthusiasts on the other side of the equator.
So the new bms supports heating on every model?
@@RFDarter I think so. 150A and 200A for sure.
Wow, JK should be absolutely amazed with all bugs you are finding within a whim. Take a breath, calibrate a SPAT and let's hope JK watches (and understand all "not good"'s. Frohe Weinachten und ein guten rutsch im neuen jahr 🎉
Hi, I love your videos. They are great and very helpful. Do you have any information whether this JK invertor BMS can co-work with Victron Multiplus correctly with multiple parallel battery banks with own BMS ?
Great videos! Thanks a lot! I wonder if can connect jk bms in series and have some PLC connected via RS485 to get information from all boards?
Heya, nice test again thanks. still in the market for 3 BMS's hope they will upgrade the software for parralleling batteries soon. can't wait for the next test.
Hi Andy, is there no switch or button on the BMS for a kind of factory reset. So you can try to update it again?
Andy, just a stupid question: can with parallel a JK with a seplos V3? thanks for you fantastic videos that help us so much, cheers mate
Yes, absolutely. You can parallel all sort of BMS and batteries as long as the voltage and chemistry is the same.
@@OffGridGarageAustralia thank you, master!!!
merry christmas andy .. a funny fact is that 0.7 amps for the 200 amp bms wont get detected as charge and i thought the funny fact that 0.7 amps for almost 300 amp bank wont even charge it!!! i think it can just co exist as a tiny current !!! wishes for a happy new year too no point of waiting 5 days
Andy, could you please request a custom battery type tab where you can set and save, then load all your parameters
Hi Andy,and thanks again for this video..Andy i just want ask you (and i'm not remenber if you said it in your previous video?) the last version of the software with new setting added,match only with the "inverter BMS" or can match also with the previous BMS model (like the black one) Thanks.
The highest in the Grove was Sunday 36.4C, cooler today 28C!
super video! the paralel function is the first time that I see it in action.
it really is the best function of the new jk bms.
they could increase the equalization current on the bms so I don't have to use the extra capacitor ones.
even thought the new feature with parallel settins is working and is a great achivement...I think I'll stick with the old JKs
thank you for the videos. great work
On your web site, the folder for DOCUMENTS for the JK smart BMS contains only a document about a relay. Were is the full manual? Thanks.
😢😂 hi andy a little clarification on the cerbo which takes into account the discharge and charge settings of the master and slave!!! is necessary! take the test! discharge at 80a on the master and slave yes it will display 160a but it only takes information from the master! if you discharge 120a you will see that the cerbo will create a significant discharge alarm because for him it will be 80a and no!!! 160a!!! a+
Well done Andy. I will buy 2 JK inverter BMS now. BTW, I have two battery's in parallel in different capacity and they are always in the same soc. No problem here. One with JK-BMS and one with qucc bms.
Great! I made the same observation with all my batteries, regardless what capacity they have, they are very close together and sync to 100% when fully charged.
@@OffGridGarageAustralia …but what‘s the explanation for that? Seems like then currents are proportional to the capacity - but why? 🙂 Functionality of bms, or some physics?
@@jlegen Because internal resistance changes based on state of charge and capacity. If you have a 100Ah and 200Ah pack, the internal resistance of the 200Ah pack is less than the 100Ah pack, therefor the 200Ah pack supplies more current than the 100Ah pack when both are in parallel. They keep each other in balance.
It does make sense that the Master always needs to be at address 0, so that any other(!) address signals to the relevant BMS-ses that they are Slaves & need to expect a Master. When using PC software compared to Bluetooth, I also noticed similar issues that communication is slow(er) and discrepancies on the PC compared to BT. I guess there are still some rough edges on the software, hopefully it can be fixed soon.
Wishing you happy holidays and a fully charged 2024!
PS: it is "normal" that when you chance the battery-type, the battery-capacity is "reset". I believe it is to protect the BMS in case you choosen the incorrect battery-type?
Hi Andy,
Can you do a video on battery fire prevention including best fire extinguisher for lifepo4 battery and any fire prevention steps.
Thaks
If i have two batteries and two JK 200a BMS connected to one inverter, in master and slave configuration - Can I draw up to 400 amps from the batteries in total? Or, is it limited to the max amps of the master bms, i.e. 200 amps total from both batteries?
EEL now offers their new V3 battery-box with the JK-Inverter-BMS included - i think other Brands will follow soon.
Very nice ! 🐸🐸🐸
Loved the deer, mate. I heard rain coming south from my mate on the gold fields north of you. Room finish, but having problems getting the right guys to connect my system to my house. Long story not here.
Nice work once again Andy, they’re listening to your recommendations 👌
Can I connect two 24v batteries in series to get 48v. I have 2 batteries made of 8s EVE 304ah using two JK 4s8s 200amp BMS. I wish I had bought 8s20s version. Now connected as parallel as I have 24v inverter. However now I got solis hybrid inverter which accepts 48v battery. Moreover, how can I get these two JK BMS communicate with each other and the inverter.
Is it possible to connect in parallel another models of JK BMS i.e. B1A8S20P, using CAN/RS485 3/4 pin connectors on it?
Hi Andy, Thanks for your very informative videos. I need a Bms capable of 400a max. Would i be able to achieve this by using 2x JK 200a BMS. I have 2 6s packs so could run 1 bms per pack and draw 400a right?
Hi Andy for your BMS problem block on request to JK a Provision Code to reinject it and it should go after your test it is not push because if you leave the 2 bms in // what days you will realize who sinceronizes more in upload and which loads the same thing it deregles and come back to factory alone tell me if you have seen that !!!! THANKS😂
You need a new (temporarily) sign : JK's Headquarter of Quality Control
It feels like they have not really done their job, the development of the windows software and the quality control that builds the releases.
it seems like you touch a topic and a bug jumps out of the screen into your focus / eyes
Luckily it is more or less fixable and nothing burnt into a rom which would require a chip exchange, just software or maybe firmware.
I still hope that this will be our next BMS cause I have more or less given up that SEPLOS will get their BMS right, which will mean I will have to add a Neey active balancer sooner or later depending on how long the new grade A cells stay so close together with a deviation of 0,005V - huge difference to the previous grade B lasered cells from EVE.
in 1 year we should have a bigger deviation after 200 to 240 charge cycles.
And I can not wait to see the whole system with the peter board working and the progress of the general DIY battery build market cause you are pushing on everyone hard to get things done and deliver running hard- and software that should work flawlessly. Quite a long journey you had embarked to.
The whole market of DIY builts and blueprints is shifting and more and more are pointing or linking to your channel.
Hats off!
Hopefully SEPLOS is listening and watching how far ahead the competition has pushed and that they finally neeed to catch up, not only working on the hardware improvement, but also on the whole system performance and issues. I can not really recommend the SEPLOS BMS anymore even though 1 year ago JK had nothing which came close to an inverter BMS (cause I had bought back then their CANBUS edition which was not capable at all, I mean running with a growatt inverter for example).
And now it has flipped, JK far ahead of SEPLOS in such a short time and I bet SEPLOS is falling even more behind considering the progress JK has achieved since summer.
My idea of a master is that, beyond capacity and maybe a few other settings, all the slave BMS would have the same settings. Maybe there's a switch to have a slave follow the master BMS? Right now it looks like just a way to group a bunch of BMS's together and aggregate the data for your inverter.
Will the SOC decrease in winter time even there is no current flowing? Or does it need to trigger the 0% SOC voltage?
So Andy connected jk in paralel , did jk swap.
I have a question for everyone. Can we sonnect jk in series to be used as replacement for server rack HV battery?
Acctualy which bms is in in all thise HV connected server racks?
❤great question!
Good question!
Wondering about same thing..
Install a nice Hybrid Solar Air Conditioner Andy..... Like the EG4 :)
Its probably just picking out the wrong field from the data packet on that "100AH" display on the PC. I also like how the voltage gauge goes all the way to 200V and the needle obscures the value display.
@@BobDevV The Victron will have a maximum amperage setting separate from all the BMS monitoring as well. Obviously that would be set to what the wiring, breakers, fusing, and devices can actually handle regardless of what the batteries themselves can handle.
You are making an incorrect assumption about the shunt. If you look at Victron's product line-up, their smart shunts are 500A, 1000A, or 2000A. The smallest offering Victron has is the 500A shunt.
Most people will be limited by the wiring they choose, not the shunt.
In anycase, one always has breakers and fusing for the capabilities of the wiring, including the shunts. Whatever the worst-case winds up being, if you make a configuration mistake, you blow a fuse or trip a breaker. Nothing actually fries.
For example, I have three batteries in parallel for 200Ah @ 51.2V, capable of discharging or charging 200A continuously and bursting for 400A. Great. But my cabling is 2 AWG so the actual maximum amperage is only 115A. My fusing is 100A and I have an 80A master breaker because my current system doesn't have the ability to charge or discharge more than 60A anyway.
If I had a setup where the Victrons were under a centralized control system, I would thus set the global amperage limit to 60A.
-Matt
did you get an reply on the average of SoC, or will jk inverter bms still report SoC only from the connected board?
i found out if i choose pylontech protocol instead of deye protocol i get an average SoC.
Good day Sir Andy. I just want to ask: Can i parallel Pace BMS and JK Inverter BMS thru RS485?
No, they will not talk to each other. We have to wait for the CAN to CAN Multiboard Peter is currently developing.
@@OffGridGarageAustralia Is it advisable to parallel two lifepo4 battery packs with different BMS brands without linking the RS485 ports? just to increase the capacity of my ESS.
You can use batteryaggregator with the help of the setuphelper tool. Than you can have multiple batteries from different vendors. works for me.
Thanks for the video. Very educative. Is it also possible to connect a 150A (or 200A) as a slave to a 100A (JB-PB1A16S10P) to a Victron CerboGX?
Yes, you can mix different JK BMS, PB2A16S20P and PB1A16S10P. Make sure both have the same new FW 14.15 which fixes the SOC calculation.
Hi Andy, do you know if the hardware version needs to be the same.
Mine is V15.XA
hi, there i have jk bms and i was trying to connect via usb on desktop?laptop , did`t recive any data from bms .
There is any way how i can make thi to work , any advice will be much apricieted .Thanks
Good morning.
I have 3 BMS JK-BP2A16S-20P.
I set them to 0000 1000 and 0100.
I connected the RJ45s but I can't get them to communicate together
I think this could be important: Charging Settings should copy to slaves in case of the Master fails. (If the lowest ID becomes the master then… or only 0 is a master? Which would be a single point of failure)
If the 200A version can’t see less than 0.8A the victron system still knows what it pulls, correct ? So SoC might be not correct but maybe better that shared current is not activated with this BMS
Hi Andy I have a quick question for you, my system has been built up over a few years now I have inverters to charge batteries and charge controllers of different makes none of which are victron would you bother to communicate with the inverters to charge or just set all the charge voltages the same as I have and call it done
Hi, i have Three JK-PB2A16S15P (v14.19) in parallel, but on the Cerbo I see that they keep losing the connection to each other, sometimes only one, two or all three are displayed.
Ah and Andy - coud you please test the calibration like calibrating at 10A and then going up to 30A for example?
Also on dicharging please!
Have a wonderful Weihnachten erstmal!
VG Hannes
Sure, will do! More testing coming...
Regarding the state of charge being reported to the inverter. What are the chances that the lowest value of the 2 is the one being shown?
is there a good source for this bms? Since the offical Jk-Store on Aliexpress does not ship to germany.
Some other shops seem to have the bms in stock an shipp to germany for a even cheaper price, but is that legit?
Good morning mister. Maybe you can help me with my issue. I have two batteries one deye rwm6.1 and seccond which I made is lifepo4 280Ah 16s.
I TSH which I made myself I use jk BMS pb2a16s20p. Maybe you know how to make connectio between the batteries and my inverter deye 12kW hybrid?
I'm be very appropriate. Thx.
It's really cool that you do the tests... Comparison.. and all but I prefer a much more simple approach. The complicated computer communication is just way to much effort
What is this green port written dct on communication plate?
Is it dry contacts? If it is then what is itsfunctiolity of it?
Does it really work in this bms?
Kinly make video on its functions.
Hi Andy, Good video thank you. Mine has version15:5 and when I do exactly as you show and I select the software 15:10 for the JKPB2A-15S-15P which of course is what mine is, it just says "Device identify is not same as connected device!?? In fact I tried all four of the versions in case there was a different type in this box, same result with all.
I have to update the firmware as 15:5 loses all the settings when you switch it off, has anyone the same problem and if so is there an answer please?
I see the jk BMS has 14.14 now. Any ideas what changed?
Could you ask JK to have the BMS to have a web server for control and this then would not need any remote software.
Amperage resolutions can push the ADC. +/-250A = 500A range. @ 8 bits it would be 1.9A resolution. @ 10 bits it would be 0.49A resolution. And @ 12 bits it would be 0.12A resolution. 500 / 256.0 (8 bit), 500 / 1024.0 (10 bit), and 500 / 4096.0 (12 bit).
They are other ways like op-amps circiuts with variable gain, or ready to go 16bit integrated ic for shunt measurements, you simply puts external shunt and it works , ect,etc someone just did not make his best when doing this
@@tomaszszczepaniak2101 If you want to double the build cost and calibrate a variable gain op-amp circuit, sure. Otherwise, no. 100% of designers will choose "no" for a product like this. Seriously.
These types of products will almost universally use the ADC built into the micro-controller rather than a discrete ADC chip. 8 and 10 bits is easy. 12 bits exists but is less common. At some point getting higher accuracy cheaply requires switching from SAR to Sigma-delta. Things can get messy very quickly at higher ADC resolutions.
Going higher than 12 bits, fully calibrated, generally adds too much expense for a product like this.
Same thing for the op-amps. A simple level-shifter and fixed-ratio amplifier is just a few parts. Like 5 or 6. Two fixed-ratio channels would run 10-12 parts. The instant you try to get more fancy than that you will end up with 20 parts and still not be done with the design.
Doing more than the basics quickly makes a device like this too expensive to be able to compete in the market.
-Matt
Variable gain op amp is op amp with like 3 resistor and one connection to mcu processor its less than 0.1$ . They should do it , becouse soc is roc stable when 0.3A load exist
Generaly i understand your point of view and as person who work in embeded i understand what you say and why its like this, but as a customer i will complain , it don't work good enought for 200$ bms ;)
@@tomaszszczepaniak2101 You can't control the impedence of the micro-controller's I/O pin when trying to pull-down to create the resistor tree, plus there is leakage on the resistors that are "off", plus the microcontroller's output won't pull all the way down to ground. So at a minimum you would need N-channel FETs hanging off the resistors and then control the FETs from the microcontroller.
As I said, calibration becomes a problem. Actually not just calibration, but also temperature compensation. They both become huge problems.
I guess level shifting isn't required for a shunt since the battery cabling for the shunt is ground-referenced. But since current has to be measured in both directions, you would need two op-amp circuits at a minimum (one for each direction) to avoid having to generate a negative supply.
-Matt
Happy Christmas Andy!
Thank you very much for your support!
Is there a dedicated software for monitoring the Seplos BMS?
Hello Andy, thanks for the great videos about the new JK. Will this JK-BMS also work with RS485, did anyone test this? I don't want to install a CANHat on my RasPi if not necessary.
About the state of charge, It should make his own calculation with the reported remaining and total capacity
Hi ! Great job.... Well done Andy....
Have you tested and so are you sure that the new JK works with 8s and 24 Volt? Greetings from former „West-Berlin“
Hallo Andy Merry Christmas für dich und deine Familie und schöne Feiertage vielen Dank für deine tollen Beiträge Videos finde ich immer sehr interessant ich habe jetzt einiges sehr gut davon gebrauchen können und es hat mir sehr geholfen.
Viele Grüße Wolfgang
I have 4 JK BMS's connected in parallel but can only see one of them (in the PC parallel mode). JK tells me I have to physically change the ethernet cable to the other BMS's to see them in the software, "really JK?". By the way I've outfitted the BMS's to the EEL box's made to accommodate the new JK inverter BMS.
you have to set the switches of the master, slave 1 at the dip switches. then connect to the right battery number according to the dip switch u set in the comm board of each jk bms
@@raffy323232 I do not get your answer completly. I have to set the number of batteries I have at each battery using the DIP switches? I thought that you set the ID. Because that is also reflected in the name in the App and in the settings you see that, too. But I am still struggling with paralleling two batteries. I have two JK BMS in version 15.17. I have a LAN cable going from one rs485-2 two port to the rs485-2 of the other bms and cannot see the 2nd bms in the software. If I connect to rs485-2 with the PC I only see the main battery or if I connect to rs485-1 I do not see anything. May it be that my protocol is wrong?
Hello Andy great seeing your videos. Keep looking at the sky. Question, have you ever heard of a 16s cells going to zero volts. All cells suddenly are at zero and after 3 to 5 hours later it goes to normal.
Next day the same thing happens. Its a daly 100A. I've had this to over 1 year now. Thanks
Thank you. That can only be a software glitch in the Daly BMS. Does the BMS turn off during that time?
Due to the wonkyness of JK I've had my battery builds on hold for over a year trying to figure out the issues with the various JK bms' I've purchased/installed. I tried to figure the issue from a logical standpoint and am still conflicted. The programmers at JK use some logic I'm not familiar with. And due to that I've been waiting for them or someone at another manufacturer to come up with a bms that doesn't use 'pretzel-logic'. It's very disheartening as a one off type buyer to continue to have to replace components and wait for deliveries. I often wonder how the makers of power stations, cope with this. Probably pallets of returns is my guess. I realize these are complex devices, but not enough quality control being used?*!
Hi Andy. can you do a video on the new Xiao app . the old version was great . Now my bms Jiabaida want discharge.
Hi Andy, another big JK software problem in parallel BMS: As you showed us in VenusOS/Cerbo under BMS/Details the number of BMS / batterypack is missing. As you said, this is NOT GOOD. But that's only the tip of the iceberg. My experiments show me that only voltages and temperatures of BMS #0 (the master with the CAN uplink) are transferred to Victron, no values from any other JK BMS (slaves) 😧 That's not bad, that's ugly. If cell voltages or temperatures of the other BMS / battery packs are running out of the secure range, Victron doesn't get the information, cannot for example ramp down the MPPT current.
Can you cross check my results and if you confirm that, report this big bug to JK. Thank you for your great work 👍🍻
PS: I would be happy, if I made a mistake.
Ich schaue gerne deine Videos, obwohl sie so ungewöhlich lang sind 😄Dein Dialekt kommt mir bekannt vor. Wo kommst du den ursprünglich her? gruß Martin aus dem Saarland
Andy, will JK have official support page (app and PC software) or we have to rely on you? /end of sarcasm
I hope they will get it right at some stage🤷♂️😄
Dear Andy, this is the sixth time I am trying to post questions on asking why I can't email Vincent before my posts were automatically removed by youtube. The email at jkbms site is invalid, I keep getting "email address not found" whenever I tried to send it to vincent email there
Anyone knows if this parallel feature makes it possible for one nmc bank parallel to one lfp bank or not recommended as usual?
Great Video again as always Andy!
Voltage gauge from zero to 200V in the PC-App.
Also gib ihm. 😂
Frohe Weihnachten, Andy.
II think I seen one of the battery 100% SOC at 3.1V is why it showed 100% every time you click in battery type it resets a lot of settings. I found that out way back when I was first configuring mine.
Im looking for an nice housing/enclosrue that fits 16x 280Ah cells and this new JK BMS. Anyone experiences and/or recommendations?
I'm not really looking for a box including BMS, as that is just waste of money.
Best cases are from my perspective still from seplos. you might buy one case from them and modify it for the jk bms.
It's our shortest day tomorrow, which means for you Andy, its your longest day.
Thanks for the video. I really use a lot of the new BMS.
I'm having trouble with my JK BMS, was working fine, left the house and now the battery voltage is all over the shop 😢
You leave the garage door open but there are no bugs flying around the lights or mosquitos. Also it’s hot, but you don’t sweat much, your garage only has fans? Are you an AI?
I managed to connect to the rj12 connector with rs232 and 'use' the desktop app. Of course, the bms (100A/1A balance) has old firmware, so I couldn't see anything other than some zeroed voltage/current gauges. Tried to update firmware, but it said the firmware didn't match the device. "Device identity is not same to connected device!"
OK, so I managed to update the firmware to .14. I realized that my rs485 adapter cable only had wires running to pins 4 and 5 on the rj45 connector, and the jk pinout description says pins 1,2 OR pins 7,8 are the rs485 A1 and B1. So I cut the cable and twisted on the brown and whitebrown wires from a cut end of a spare cat5 sitting around. Looking on the back of the jk connector board, it looks like there are only traces coming from pins 7 and 8, so I can't see 1 and 2 working. I measured the V coming out of the two wires from the usb adapter, and got ~3.5V when the leads were held with a certain polarity. I figured this would identify which one was the +, which I thought was the rs485B, but this didn't work. When I reversed the connection to pins 7,8, the brown/brownwhite on the rj45, I got things to work. I will mention that things did not work all at once - it seemed like I could see the overall cell voltage right away, but the rest of the desktop app showing me the controls tab took a minute or more to show up, and all of this was needed before I could actually update the firmware. I think I might have also needed to reboot the bms while the desktop app was running - not sure. A note to all trying to see anything in the desktop app for updating firmware - check the pinout of your adapter cable and don't be too quick to change connections around - things might take some time to load up. BTW I did have to set dipswitch 1 to ON. The led built into the rs485 adapter blinked a LOT brighter once I did this AND had made the polarity change. So all good. Deserve a dram. Merry xmas everybody!
A solstice video :) did you see mine with your cameo?
Deer is Reh, Hirsch ist Stagg (the one with the Hirschgeweih (Antlers)).
With all the deer you got today you can easily pull a sleigh, Andy 😂🤣😂🦌🦌🦌🦌🦌
Hello Andy, I have found one issue with the jk-bms.
Every time I use the powerbutton to switch the bms off it lost all parameter who i have given them.
And this are the answer off Hakinzor woh I by my bms.
„Hello, this is a normal phenomenon,
You can use sleep mode in the app so that it won't reset your parameters. You can wake up the BMS on the next use.“ For me it dos not work.
Will this have others here at that channel? Greetings
Are you running the latest firmware ?!
@@andreasw5925 yes 14.14 👍🏻
I noticed exactly the same. With the initial V14.03 my 3 BMS didn't loose their settings!
@@stephanklasen2928 Thx for confirm I’m thing I’m stupid with the all time data losts.
Andy tests 2 BMS in // in full and complete recharge for a few days, you will see who there is big communication problem to give between the 2 BMS !!!!
😁🤣
The total SOC for a system using parallel batteries should use sum(remaining capacity of each) divided by sum(maximum capacities of each) & display as percentage. Averaging reported SOC% of a system using very different capacities capacities would be misleading. What to do when discharge has been turned off for a battery, is it still included for system SOC?
The new FW 14.15 fixes the SOC calculation.
Not sure of it still calculates SOC correctly if one BMS has dc turned off. We never tested such things in any BMS. I would expect SOC is still correct as for this battery SOC remains constant.
Thank you for doing all these tests. In a few days I will receive the hardware to do the upgrade. Then I'll be able to install a second BMS Jk on the second battery. It's reassuring to know that there are few bugs to correct. And I didn't know that BMS were limited in accuracy. 0.7a is still a lot I think. Does that mean that if I use only 0.4a 24 hours a day, for example, it won't detect any changes? Or just that it can't see it but counts it by deducting the overall voltage? I'm a bit confused about this.
Thanks again Andy. 😊
For lifepo4 there is no chance to calculate the SoC based on the voltage as long as the voltage is not close to a fully charged or almost empty state.
Even with better accuracy the SoC reset is needed from time to time by charging to 100%.
Thanks !!!! Was waiting for that ❤
It would be great to have one tab or one window with multiple views of all batteries connected in parallel, even if there are 2 or 15 of them. (The Sun Fun Kits V5 BMS app has a very nicely done multiple view in one window of their 12V batteries connected in parallel or series).
It would also be great to be able to set up a Master BMS and simply have the possibility to propagate all the settings for all batteries connected in parallel at the one click of a Propagate BMS Settings button.
That's what Seplos does now with their V3 BMS. One page shows the important parameters.
Thanks Andy, Merry Christmas
Merry Christmas🎄
Merry Christmas
I had the same problem with jk bms when it got bricked, but fortunately resolved it. You need to keep pressed power button, press reset button (blue). It may hard reset the bms, if no then do the same with buttons and after that update the firmware (keep pressed power button during update)
What is the exact order you followed?
I got instructions from them which don't work or are inconsistent.
@@OffGridGarageAustralia
1. Connect the cable, open PC software, select right address and press connect, it will show zeros
2. Select firmware file, but be carefull and select right file for your bms, press force update and enter 53122019 (If does not fit then request a new one from jk)
3. Turn off the bms, just reconnect red wire
5. Then you need to keep pressed the power button whole process and release after update. Press and keep pressed power button, press and release reset button and press update in the PC software.
Please can anyone tell the mean of 10p, 15p or 20p in jk inverter bms. Thanks