It is important to understand the RCV and RFV settings are just requests sent to inverter/charger to adjust the inverter/charger's charge parameters. The inverter/charger is still the master regulating actual charge rate. If inverter/charger does not understand the BMS requests due to inverter/charger not having the proper RS485 or CAN physical interface and matching comm protocol with the BMS, the requests will not be executed by the inverter/charger. The BMS does have a DC to DC converter (big toroid inductor visible) across the charge disable series pass MOSFET's. When charge MOSFET is disabled the DC to DC converter can activate allowing 0 to 10 amps charge into battery. This is helpful near full charge state where too much cell imbalance would cause a full charging shutdown due to a cell overvoltage condition. BMS can fine tune the charge rate down to low level still allowing balancing to continue but preventing a cell overvoltage shutdown by reducing charge rate. There must be comm with inverter/charger to use this because inverter/charger without BMS comm will likely interpret charge current drop off as a fully charged battery and drop inverter/charger down to float mode charging voltage level. During this BMS buck converter charge rate reduction it tells inverter/charger to maintain an absorb voltage level charge voltage.
I set my inverter to lead acid and charge voltage to 58v and float to 54.4V works good for me I get to 3.65v without a problem every battery is balanced. I don't see a need to use comms treat the inverter as a power supply. Some reduce the absorption to 56.4V for longer battery life I like faster charging.
Hi, you should just be able to plug an ethernet cable into the RS485 parallel port on each of the BMS's and it works. This video might also be of interest about how to connect up the communication ua-cam.com/video/iXuFI8-lFQ8/v-deo.html
Hi Alan, hello and thanks very much... have another two JK Inverter BMS related videos out already, and currently working on a fourth video, hoping to have it out over the weekend.
I bought 4 Apexium DIY battery kits with the JK Inverter BMS PB2A16S20P. The first one I built had a bad BMS right out of the Box and it looks like Jkung is not going to replace it. 34 days have gone by without a commitment to replace it. This is not good after sales support.
Hi Grant, Can you help me confirm a bit about the Dry contact relay settings? I need the BMS to activate the relay at certain SOC % And turn off the relay at certain SOC % Say I want to turn off the inverter Mains input as soon as Battery SOC reaches 70%. And then reconnect to mains as battery reaches 20% SOC. I mainly use solar for power saving. Thanks.
Hi, I think it may work. The dry contacts are Normally Open (NO). There are three settings for triggering these relays... Trigger, Trigger Value and Release Value. I tried the following -> Trigger set to 'Low SOC' and Trigger Value set to 21 and Trigger Release set to 69, the relay closes when the SOC reaches 20 (i.e. drops below the Trigger Value of 21) and the relay opens again when the SOC reaches 70 (i.e. rises above Release Value of 69). You'll likely have to use a contactor to reliably connect / disconnect mains input over a long period of time.
@@GrantBurton wow thanks for confirming. I'll probably use the dry contact to trigger a 2nd, much beefier relay which can take the mains load comfortably. Then use it to switch mains. Though I wish they should have given low soc as well as high soc trigger to make it even more flexible. BTW one more thing! Can we manually override or switch these relays using the mobile app? Say if I need to activate mains for charging?
@@ZenInnovations A workaround may be to use the Low SOC triggers to drive another relay with NC contacts... So when the Low SOC relay releases, the additional NC relay loses power and thus closes it's contacts acting like a High SOC trigger? and when the Low SOC relay triggers, the additional NC relay energises thus opening the additional NC relay contacts. Probably easier for JK to just add the feature in software though. I don't think the relays can be manually triggered (like with a software switch)... I'll need to have another look though.
Well this is a bit annoying...I was advised to go with a Seplos BMS as the JK will not work with my Sunsynk ECCO Inverter....I'd have much rather gone JK as well....Bugger ! I'll get the JK now and see if i can return the Seplos. Thanks for the vid.
Hi, I wonder if the @sunsynk ECCO inverters use different communication compared to the 'normal' SunSynk inverters. I've only has the JK Inverter BMS connected and communicating with our SunSynk inverter for a couple days now... so far, everything seems to be working but its still early days I guess. I am busy working on another video on how to connect the JK Inverter BMS to the SunSynk Inverter using CAN Communication, and showing the information it displays and testing how the Charge and Discharge Current limits and Charge Voltage Limits interact with the Inverter... should be out in another week or two (hopefully).
@@GrantBurton Hi Grant... Thanks for the reply, a video on how to connect the JK using would be extremely helpful.....I'll look forward to it...Subbed.
@@GrantBurton Yep, there's nothing else for it mate lol....Deep dive imminent !!!! On a serious note though, It'll help a lot of users as there's not much out there when it comes to diy batteries and Sunsynk playing nice together...it'll be much appreciated.
@@kennyrodg Why do you need coms does that inverter have a lead acid setting? If your battery is 48V 16S set to absorption to 58V and float to 54.4V no issues. Let the BMS do the job of protecting the batteries and balancing treat the inverter as a power supply.
I was running firmware version 15.11 (on hardware version 15 or the JK Inverter BMS) but noticed SOC wasn't aggregating correctly with 2 batteries in parallel, but everything else was working well. I've upgraded to 15.17 and set 002 - PYLON-Low-voltage-V1.2 as the CAN protocol to communicate with SunSynk Inverter and everything so far seems to be working. I haven't run anything before firmware version 15.11 but I've heard of a few people reporting problems with earlier firmware versions... so maybe it's a good idea to update to at least 15.11? (or the equivalent firmware version if you have Hardware version 14 of the BMS)
@@GrantBurton i m experementing with the late version of the older b series with balancer right now.. i hope the inverter one locks the cold parameters better !!! long term problems.... it doesnt accept 123456 code unless i force it again without erase the numbers.. .... hope the new bms doesnt have that anoying bug .. i wont update my old one for those 2 tiny problems but wishes it doesnt show more bugs
@@panospapadimitriou3498 I think there were problems with the old firmware on the Inverter BMS, but those bugs have now been fixed... at least from 15.11 onwards that I know of. The password on the new BMS doesn't seem to be giving those problems on hardware version 15, but I do remember hearing some people were experiencing password problems with the old style JK BMS. I used two of those older ones for over a year and didn't experience any problems luckily.
Hi, the values you set depends on the specifications of the battery cells you are using, so best is to check the data sheet for your cells and make sure none of those limits are exceeded. Credit to Andy from Off Grid Garage... I started using the settings he talks about in his videos, but I set my own charge and discharge current limits appropriate for my cells, and over time make small changes to suit my exact setup... but I generally lean towards safe / conservative settings and not settings that run right up against the limits.
Thanks for your comment. I also used the previous style (non-inverter JK BMS) without communication for over a year and it also worked great. What inverter are you using?
@@mflo1970 Victron make great quality products. Have you checked that the CAN High and CAN Low wires are going to the correct pins on whatever is handling your communication (probably a Cerbo GX?). I think on the Victron systems, CAN high is on Pin 7 and CAN low is pin 8 but on the JK BMS, CAN high is Pin 4 and CAN low is Pin 5 so a standard ethernet cable won't work. You may have to make up your own cable.
@@GrantBurtonYou can also buy one off Victron. Victron can work with the Pylon protocol. Not sure if JK has Victron specific protocol. BTW loved the video. You sound like you're a professional presenter?
@@mondotv4216 Hi, there is a Victron CAN protocol that can be selected in the JK BMS app... I think it is 004 - Victron_CANbus_BMS_protocol_20170717. Thanks very much for your comment. I'm no professional presenter, just an average guy... but thank you.
Not sure if you missed it in the video? … but at 02:00 I say the model number of the BMS being reviewed (if you have the resolution set high enough and pause the video there, you’ll also be able to zoom into the product label on the BMS, which shows the model number).
Found this channel just now. Really good content- great job. I'm looking forward to further JK firmware updates to support other inverter brands like Luxpower. Also, I know this will more than likely require a hardware change but would be awesome if JK BMS' had wifi to allow the BMS to be monitored over the internet similar to Daly.
Thanks very much. I'm sure over time they will update and add support for other inverters... let's hope. I guess adding wifi monitoring is possible with a sort of 'wifi adapter' that plugs into the RS485 port, which pulls all the info and uploads to something like home assistant (or the JK app if its hardware made by JK). A couple weeks ago, I remember reading on one of the forums about somebody having programmed an ESP32, which plugs into the BMS RS485 port and draws the BMS info and streams it to Home Assistant... so i guess it could be indirectly monitored through Home Assistant.
Hello and congratulations again for your great video I had a question: can the JK-PB2A16S20P communicate easily with a victron multiplus II 5000VA? what equipment do you need special cable in addition? I'm trying to find out about the bms because as I have a large 24 volt 1300AH battery pack I would like it to work perfectly before investing in the BMS and the victron multiplus II! laurent
Hi Laurent, thanks very much. I've never tested it with a Victron system (can't afford Victron unfortunately), but Andy from @OffGridGarageAustralia has done extensive testing with the JK BMS connected to his Victron system (48v system). I think you need a Cerbo GX to get the communication working between the JK BMS and the Victron System. You'll also need a VE.Can to CAN-bus BMS cable. I think you can also make this cable up yourself if you have the correct tools... Andy explains this pretty well in his videos... you'll just have to scroll through his video list and look for the JK related videos because he has a lot of useful and informative videos.
hello and thanks again for your quick and concrete answer! I'll see with Andy he's very nice! for the victron I'm currently looking to find a way to switch to self-consumption not sure I'll switch to victron because it's very expensive! but maybe there's an equivalent in a reliable inverter? thanks again laurent
Is there a list of hybrid inverters that are compatible with this bms? I couldnt find a list anywhere. I have a SolaX LV Hybrid inverter. I know from experience the inverter works with LG Chem communication protocol (but i dont know if it does or doesnt work with any other communication protocols) Thanks
Hi, I think this was an issue with the old firmware... this has since been fixed with later versions of the firmware. I know it was fixed in V15.11 and later. Did you manage to update your firmware?
Hello . sorry for my bad English.i just received this model and victron multiplus,mppt and cerbo.is this bms only for DIY 48V box or can i work it with my cells without box? Thank you
Hi, JK Inverter BMS should be able to work with the Victron Inverters 👍 Andy from the Off-Grid Garage channel does a lot of testing with Victron inverters and the Jk Inverter BMS.
Hi, thanks for the info... I think it's only available for the 200A version at the moment? My BMS's are 150A versions so i'll have to wait. I believe Andy said there should be a version 15.33 out soon.
Hi George, I'm not 100% sure if it will work because I only have a SunSynk inverter to test with, but if the Lux Power inverter has CAN communication and is able to work with the Pylon CAN protocol, and if you set the BMS to the Pylon CAN protocol... I think it might work??? To be 100% sure it will work, somebody would need to test it.
Hi Grant, I have Solis hybrid 5KW inverter, and I'm using it with 16 EVE 304 cells and the same (as you are showing) JK inverter BMS with an active balancer. I've been running this setup for the past five months. The JK BMS communicates the state of charge (SOC) to the inverter, but the SOC keeps drifting over time. Here's the issue: even when the BMS indicates a 100% SOC, the voltages drift slightly lower with each cycle. Over the weeks, the SOC gradually drifts, so while it shows 100%, each cell and the overall pack voltage are slightly lower than the previous cycle. If I adjust the battery capacity settings, the BMS resets to 70% SOC, and the inverter charges another 3 or 4 kWh. This SOC drift is frustrating because on cloudy days, my 16 kWh battery effectively only charges to 11 or 12 kWh. The remaining 4 kWh stays uncharged because the BMS incorrectly reports 100% SOC to the inverter. To fully charge the battery, I have to keep changing the capacity settings in the BMS back and forth. Is there a way to use this inverter without CAN communication or by setting it as a generic battery? If anyone else has the same issue or knows a solution, please comment and suggest how to fix this problem. Thanks!
Hi, are you allowing your battery to fully charge each day... as in reaching the RCV and then holding the RCV for 1 or 2 hours each day? I have heard of the SOC drifting over time when a battery bank is charged and discharged a few times, and isn't fully 'bulk' charged each time... kind of a SOC calculation error that compounds over time... or at least until the next full charge where SOC resets to 100% again according to one of the cells reaching the 100% SOC reset voltage. Does your inverter stop charging your battery when '100% SOC' is reached (whatever voltage that may end up being) or does it charge according to the RCV the BMS sends to the inverter, and only stop charging (or reduce to 'float' charge voltage) when the RCV is reached and the RCV Time is reached / exceeded? Because if it's charging according to RCV, I don't see how the voltage should drift lower with each charge cycle because the charge should be charging the cells up to your specified voltage each time, and not stop charging until it reaches that voltage.... Unless there is something I'm not understanding (I'm no expert though... haha). What is your 100% SOC Voltage, RCV and RCV Time set to? Also what firmware version are you currently using? I think it is better to continue using it with communication as that will give you the most accurate SOC... it's accuracy (or inaccuracy) at the moment will probably still be more accurate than running in 'voltage' mode without communication.
Hi Grant, Good video, all info about this bms is very welcome 👍 Can you confirm the settings data now being stored in flash memory (IF present at the bms at all)? Andy from the offgrid garage posted a warning on this JK BMS systems resetting to li-ion settings after loosing all the data after being shut off for some days. this because the data was stored in RAM. The firmware update changed this in LTO being selected after a "reset" due to being swithed off for some days but nothing beats flash! Did you test two to five of them as two to five different but equal batteries in the Victron Cerbo? Soon, my ordered 40 extra cells will arrive and buying 3 extra 123smartbms BMS systems, each costing € 500 and more is, together with 3 relais or trip fuses, where the jk bms has all inside, kind a of dealbreaker for me. Keep up the good work!
On old firmware the BMS switched back to stock LTO settings when the input parameters made no sense. This was intended by JK. After many concerns they changed the firmware and give a direct warning if you type in stupid values. So you cannot store stupid settings anymore and therefore the BMS does not reset back to base settings.
I have a cable supplied with the BMS, it is a bundle of 4 or 5 green wires connect all to a lug, and also a red and black wire. Other end has a connector, I think it fits in the left over port on the BMS, maybe for heating pad? We dont use this green wire-bundle?
Can't say that I've seen the green wire bundle you are referring to, but if it connects into the heating port plug on the BMS at 02:52 (the plug next to where the balance leads plug into), it could be for the heating pad connections. Not sure why they would all be connected to a single lug though.
@@GrantBurton i have info from my supplier, its indeed for the heating pad. These green wires will be tied to ground, offering current to flow and active the heating if this is in use. We dont have to connect this port.
@@GrantBurton i have my first of 3 packs now live. Its on a Deye 12kw hybrid. We select lithium-00 right? In the Deye. In JK we select canbus deye protocol? So far this seems to work here now with 1 pack. Fw 15.26.
Yes, On the Inverter select Lithium as battery type and Protocol should be 0. On the BMS, set CAN protocol to 001:Deye or 002:Pylon... both should work. I haven't used firmware 15.26 yet... Both my BMS's are on 15.27 at the moment. Also set BMS address to 0 (all 4 dip switches off) so that it is the master BMS. Make sure to check on the Li-BMS screen on the Inverter that the BMS is communicating with the Inverter and that all the limits that are set in the BMS are being reported correctly to the Inverter.
Hi, I'm not 100% sure if it will work because I only have a SunSynk inverter to test with, but if the Lux Power inverter has CAN communication and is able to work with the Pylon CAN protocol, and if you set the BMS to the Pylon CAN protocol... I think it might work??? To be 100% sure it will work, somebody would need to test it.
Hi, it can be used like any other standalone BMS, it doesn't need the communication to be connected to the BMNS for it to work, however you'll need to set the 'dumb' charger so you don't overcharge your battery/cells and set the Inverter to stop discharging the battery before it gets to low.
I’m not 100% sure what all the requirements for a BMS on an electric bicycle would be but I guess it would work… it basically has all the same functions as the other ‘non inverter’ BMS with a couple of additional features… but I don’t think these extra functions would need to be used. The downside is that the Inverter BMS is much larger and I would think that space on an electric bicycle is at a premium. Are you busy building an electric bike?
I ordered on Aliexpress a few days ago, it is already on the way, after I realized that it is designed for solar panels and performs a lot of functions, now I will have to study the bms before connecting
It is important to understand the RCV and RFV settings are just requests sent to inverter/charger to adjust the inverter/charger's charge parameters. The inverter/charger is still the master regulating actual charge rate. If inverter/charger does not understand the BMS requests due to inverter/charger not having the proper RS485 or CAN physical interface and matching comm protocol with the BMS, the requests will not be executed by the inverter/charger.
The BMS does have a DC to DC converter (big toroid inductor visible) across the charge disable series pass MOSFET's. When charge MOSFET is disabled the DC to DC converter can activate allowing 0 to 10 amps charge into battery. This is helpful near full charge state where too much cell imbalance would cause a full charging shutdown due to a cell overvoltage condition. BMS can fine tune the charge rate down to low level still allowing balancing to continue but preventing a cell overvoltage shutdown by reducing charge rate. There must be comm with inverter/charger to use this because inverter/charger without BMS comm will likely interpret charge current drop off as a fully charged battery and drop inverter/charger down to float mode charging voltage level. During this BMS buck converter charge rate reduction it tells inverter/charger to maintain an absorb voltage level charge voltage.
I set my inverter to lead acid and charge voltage to 58v and float to 54.4V works good for me I get to 3.65v without a problem every battery is balanced. I don't see a need to use comms treat the inverter as a power supply. Some reduce the absorption to 56.4V for longer battery life I like faster charging.
Please make a tutorial video on how to connect and communicate between two JK BMS through the RS485 port.
Hi, you should just be able to plug an ethernet cable into the RS485 parallel port on each of the BMS's and it works. This video might also be of interest about how to connect up the communication ua-cam.com/video/iXuFI8-lFQ8/v-deo.html
Great vid mate, hi from downunder 🇦🇺🤙
Hi Alan, hello and thanks very much... have another two JK Inverter BMS related videos out already, and currently working on a fourth video, hoping to have it out over the weekend.
I bought 4 Apexium DIY battery kits with the JK Inverter BMS PB2A16S20P. The first one I built had a bad BMS right out of the Box and it looks like Jkung is not going to replace it. 34 days have gone by without a commitment to replace it. This is not good after sales support.
Hi Grant,
Can you help me confirm a bit about the Dry contact relay settings?
I need the BMS to activate the relay at certain SOC % And turn off the relay at certain SOC %
Say I want to turn off the inverter Mains input as soon as Battery SOC reaches 70%. And then reconnect to mains as battery reaches 20% SOC.
I mainly use solar for power saving.
Thanks.
Hi, I think it may work. The dry contacts are Normally Open (NO). There are three settings for triggering these relays... Trigger, Trigger Value and Release Value.
I tried the following -> Trigger set to 'Low SOC' and Trigger Value set to 21 and Trigger Release set to 69, the relay closes when the SOC reaches 20 (i.e. drops below the Trigger Value of 21) and the relay opens again when the SOC reaches 70 (i.e. rises above Release Value of 69).
You'll likely have to use a contactor to reliably connect / disconnect mains input over a long period of time.
@@GrantBurton wow thanks for confirming.
I'll probably use the dry contact to trigger a 2nd, much beefier relay which can take the mains load comfortably. Then use it to switch mains.
Though I wish they should have given low soc as well as high soc trigger to make it even more flexible.
BTW one more thing!
Can we manually override or switch these relays using the mobile app?
Say if I need to activate mains for charging?
@@ZenInnovations A workaround may be to use the Low SOC triggers to drive another relay with NC contacts... So when the Low SOC relay releases, the additional NC relay loses power and thus closes it's contacts acting like a High SOC trigger? and when the Low SOC relay triggers, the additional NC relay energises thus opening the additional NC relay contacts.
Probably easier for JK to just add the feature in software though.
I don't think the relays can be manually triggered (like with a software switch)... I'll need to have another look though.
Well this is a bit annoying...I was advised to go with a Seplos BMS as the JK will not work with my Sunsynk ECCO Inverter....I'd have much rather gone JK as well....Bugger ! I'll get the JK now and see if i can return the Seplos. Thanks for the vid.
Hi, I wonder if the @sunsynk ECCO inverters use different communication compared to the 'normal' SunSynk inverters. I've only has the JK Inverter BMS connected and communicating with our SunSynk inverter for a couple days now... so far, everything seems to be working but its still early days I guess.
I am busy working on another video on how to connect the JK Inverter BMS to the SunSynk Inverter using CAN Communication, and showing the information it displays and testing how the Charge and Discharge Current limits and Charge Voltage Limits interact with the Inverter... should be out in another week or two (hopefully).
@@GrantBurton Hi Grant...
Thanks for the reply, a video on how to connect the JK using would be extremely helpful.....I'll look forward to it...Subbed.
@@kennyrodg Guess I'll have to get stuck in then... haha. Thanks for the sub.
@@GrantBurton Yep, there's nothing else for it mate lol....Deep dive imminent !!!!
On a serious note though, It'll help a lot of users as there's not much out there when it comes to diy batteries and Sunsynk playing nice together...it'll be much appreciated.
@@kennyrodg Why do you need coms does that inverter have a lead acid setting? If your battery is 48V 16S set to absorption to 58V and float to 54.4V no issues. Let the BMS do the job of protecting the batteries and balancing treat the inverter as a power supply.
it is a nice piece but never forget to do the correct updates... did not updated mine yet
I was running firmware version 15.11 (on hardware version 15 or the JK Inverter BMS) but noticed SOC wasn't aggregating correctly with 2 batteries in parallel, but everything else was working well. I've upgraded to 15.17 and set 002 - PYLON-Low-voltage-V1.2 as the CAN protocol to communicate with SunSynk Inverter and everything so far seems to be working.
I haven't run anything before firmware version 15.11 but I've heard of a few people reporting problems with earlier firmware versions... so maybe it's a good idea to update to at least 15.11? (or the equivalent firmware version if you have Hardware version 14 of the BMS)
@@GrantBurton i m experementing with the late version of the older b series with balancer right now.. i hope the inverter one locks the cold parameters better !!! long term problems.... it doesnt accept 123456 code unless i force it again without erase the numbers.. .... hope the new bms doesnt have that anoying bug .. i wont update my old one for those 2 tiny problems but wishes it doesnt show more bugs
@@panospapadimitriou3498 I think there were problems with the old firmware on the Inverter BMS, but those bugs have now been fixed... at least from 15.11 onwards that I know of.
The password on the new BMS doesn't seem to be giving those problems on hardware version 15, but I do remember hearing some people were experiencing password problems with the old style JK BMS. I used two of those older ones for over a year and didn't experience any problems luckily.
Greeting
How to value recommend for jk bms setting
For battery litheum 51.2vdc
(16 cells 307 Ah
Hi, the values you set depends on the specifications of the battery cells you are using, so best is to check the data sheet for your cells and make sure none of those limits are exceeded.
Credit to Andy from Off Grid Garage... I started using the settings he talks about in his videos, but I set my own charge and discharge current limits appropriate for my cells, and over time make small changes to suit my exact setup... but I generally lean towards safe / conservative settings and not settings that run right up against the limits.
Andy is the best
Yeah, Andy has some really good information and a great channel 👍
Lo tengo pero no comunicado pero de momento funciona fenomenal
Thanks for your comment. I also used the previous style (non-inverter JK BMS) without communication for over a year and it also worked great. What inverter are you using?
@@GrantBurtonestoy usando un multiplus 48v 5000w
@@mflo1970 Victron make great quality products. Have you checked that the CAN High and CAN Low wires are going to the correct pins on whatever is handling your communication (probably a Cerbo GX?).
I think on the Victron systems, CAN high is on Pin 7 and CAN low is pin 8 but on the JK BMS, CAN high is Pin 4 and CAN low is Pin 5 so a standard ethernet cable won't work. You may have to make up your own cable.
@@GrantBurtonYou can also buy one off Victron. Victron can work with the Pylon protocol. Not sure if JK has Victron specific protocol. BTW loved the video. You sound like you're a professional presenter?
@@mondotv4216 Hi, there is a Victron CAN protocol that can be selected in the JK BMS app... I think it is 004 - Victron_CANbus_BMS_protocol_20170717. Thanks very much for your comment. I'm no professional presenter, just an average guy... but thank you.
Model number
Of what?
New jk bms
Not sure if you missed it in the video? … but at 02:00 I say the model number of the BMS being reviewed (if you have the resolution set high enough and pause the video there, you’ll also be able to zoom into the product label on the BMS, which shows the model number).
Found this channel just now. Really good content- great job. I'm looking forward to further JK firmware updates to support other inverter brands like Luxpower. Also, I know this will more than likely require a hardware change but would be awesome if JK BMS' had wifi to allow the BMS to be monitored over the internet similar to Daly.
Thanks very much. I'm sure over time they will update and add support for other inverters... let's hope. I guess adding wifi monitoring is possible with a sort of 'wifi adapter' that plugs into the RS485 port, which pulls all the info and uploads to something like home assistant (or the JK app if its hardware made by JK).
A couple weeks ago, I remember reading on one of the forums about somebody having programmed an ESP32, which plugs into the BMS RS485 port and draws the BMS info and streams it to Home Assistant... so i guess it could be indirectly monitored through Home Assistant.
Hello and congratulations again for your great video
I had a question: can the JK-PB2A16S20P
communicate easily with a victron multiplus II 5000VA? what equipment do you need special cable in addition?
I'm trying to find out about the bms because as I have a large 24 volt 1300AH battery pack I would like it to work perfectly before investing in the BMS and the victron multiplus II!
laurent
Hi Laurent, thanks very much. I've never tested it with a Victron system (can't afford Victron unfortunately), but Andy from @OffGridGarageAustralia has done extensive testing with the JK BMS connected to his Victron system (48v system). I think you need a Cerbo GX to get the communication working between the JK BMS and the Victron System. You'll also need a VE.Can to CAN-bus BMS cable. I think you can also make this cable up yourself if you have the correct tools... Andy explains this pretty well in his videos... you'll just have to scroll through his video list and look for the JK related videos because he has a lot of useful and informative videos.
hello and thanks again for your quick and concrete answer!
I'll see with Andy he's very nice!
for the victron I'm currently looking to find a way to switch to self-consumption not sure I'll switch to victron because it's very expensive! but maybe there's an equivalent in a reliable inverter?
thanks again
laurent
Is there a list of hybrid inverters that are compatible with this bms? I couldnt find a list anywhere. I have a SolaX LV Hybrid inverter. I know from experience the inverter works with LG Chem communication protocol (but i dont know if it does or doesnt work with any other communication protocols)
Thanks
If you switched off this BMS for, let's say, a week and start again, the settings will be reset. I'm not sure when the manufacturer will fix it?
Hi, I think this was an issue with the old firmware... this has since been fixed with later versions of the firmware. I know it was fixed in V15.11 and later. Did you manage to update your firmware?
Hello . sorry for my bad English.i just received this model and victron multiplus,mppt and cerbo.is this bms only for DIY 48V box or can i work it with my cells without box? Thank you
Hi, JK Inverter BMS should be able to work with the Victron Inverters 👍 Andy from the Off-Grid Garage channel does a lot of testing with Victron inverters and the Jk Inverter BMS.
15.32 is out
Hi, thanks for the info... I think it's only available for the 200A version at the moment? My BMS's are 150A versions so i'll have to wait. I believe Andy said there should be a version 15.33 out soon.
@@GrantBurton I hope all is still working fine, with 3 BMS in parallel, and with Deye. And with the SOC fixer solution :)
Good video thanks
You're welcome
Will it work on the Lux power inverter
Hi George, I'm not 100% sure if it will work because I only have a SunSynk inverter to test with, but if the Lux Power inverter has CAN communication and is able to work with the Pylon CAN protocol, and if you set the BMS to the Pylon CAN protocol... I think it might work??? To be 100% sure it will work, somebody would need to test it.
good vid
Hi Greg, thanks very much.
Hi Grant,
I have Solis hybrid 5KW inverter, and I'm using it with 16 EVE 304 cells and the same (as you are showing) JK inverter BMS with an active balancer. I've been running this setup for the past five months. The JK BMS communicates the state of charge (SOC) to the inverter, but the SOC keeps drifting over time.
Here's the issue: even when the BMS indicates a 100% SOC, the voltages drift slightly lower with each cycle. Over the weeks, the SOC gradually drifts, so while it shows 100%, each cell and the overall pack voltage are slightly lower than the previous cycle. If I adjust the battery capacity settings, the BMS resets to 70% SOC, and the inverter charges another 3 or 4 kWh. This SOC drift is frustrating because on cloudy days, my 16 kWh battery effectively only charges to 11 or 12 kWh. The remaining 4 kWh stays uncharged because the BMS incorrectly reports 100% SOC to the inverter. To fully charge the battery, I have to keep changing the capacity settings in the BMS back and forth.
Is there a way to use this inverter without CAN communication or by setting it as a generic battery? If anyone else has the same issue or knows a solution, please comment and suggest how to fix this problem.
Thanks!
Hi, are you allowing your battery to fully charge each day... as in reaching the RCV and then holding the RCV for 1 or 2 hours each day? I have heard of the SOC drifting over time when a battery bank is charged and discharged a few times, and isn't fully 'bulk' charged each time... kind of a SOC calculation error that compounds over time... or at least until the next full charge where SOC resets to 100% again according to one of the cells reaching the 100% SOC reset voltage.
Does your inverter stop charging your battery when '100% SOC' is reached (whatever voltage that may end up being) or does it charge according to the RCV the BMS sends to the inverter, and only stop charging (or reduce to 'float' charge voltage) when the RCV is reached and the RCV Time is reached / exceeded? Because if it's charging according to RCV, I don't see how the voltage should drift lower with each charge cycle because the charge should be charging the cells up to your specified voltage each time, and not stop charging until it reaches that voltage.... Unless there is something I'm not understanding (I'm no expert though... haha).
What is your 100% SOC Voltage, RCV and RCV Time set to? Also what firmware version are you currently using?
I think it is better to continue using it with communication as that will give you the most accurate SOC... it's accuracy (or inaccuracy) at the moment will probably still be more accurate than running in 'voltage' mode without communication.
Hi Grant,
Good video, all info about this bms is very welcome 👍
Can you confirm the settings data now being stored in flash memory (IF present at the bms at all)?
Andy from the offgrid garage posted a warning on this JK BMS systems resetting to li-ion settings after loosing all the data after being shut off for some days. this because the data was stored in RAM. The firmware update changed this in LTO being selected after a "reset" due to being swithed off for some days but nothing beats flash!
Did you test two to five of them as two to five different but equal batteries in the Victron Cerbo?
Soon, my ordered 40 extra cells will arrive and buying 3 extra 123smartbms BMS systems, each costing € 500 and more is, together with 3 relais or trip fuses, where the jk bms has all inside, kind a of dealbreaker for me.
Keep up the good work!
On old firmware the BMS switched back to stock LTO settings when the input parameters made no sense. This was intended by JK. After many concerns they changed the firmware and give a direct warning if you type in stupid values. So you cannot store stupid settings anymore and therefore the BMS does not reset back to base settings.
I have a cable supplied with the BMS, it is a bundle of 4 or 5 green wires connect all to a lug, and also a red and black wire. Other end has a connector, I think it fits in the left over port on the BMS, maybe for heating pad? We dont use this green wire-bundle?
Can't say that I've seen the green wire bundle you are referring to, but if it connects into the heating port plug on the BMS at 02:52 (the plug next to where the balance leads plug into), it could be for the heating pad connections. Not sure why they would all be connected to a single lug though.
@@GrantBurton i have info from my supplier, its indeed for the heating pad. These green wires will be tied to ground, offering current to flow and active the heating if this is in use. We dont have to connect this port.
Thanks for the information 👍
@@GrantBurton i have my first of 3 packs now live. Its on a Deye 12kw hybrid. We select lithium-00 right? In the Deye. In JK we select canbus deye protocol? So far this seems to work here now with 1 pack. Fw 15.26.
Yes, On the Inverter select Lithium as battery type and Protocol should be 0. On the BMS, set CAN protocol to 001:Deye or 002:Pylon... both should work. I haven't used firmware 15.26 yet... Both my BMS's are on 15.27 at the moment. Also set BMS address to 0 (all 4 dip switches off) so that it is the master BMS.
Make sure to check on the Li-BMS screen on the Inverter that the BMS is communicating with the Inverter and that all the limits that are set in the BMS are being reported correctly to the Inverter.
Do u know if the jk bms will work with a luxpower inverter to read correctly with the communication
Hi, I'm not 100% sure if it will work because I only have a SunSynk inverter to test with, but if the Lux Power inverter has CAN communication and is able to work with the Pylon CAN protocol, and if you set the BMS to the Pylon CAN protocol... I think it might work??? To be 100% sure it will work, somebody would need to test it.
Do you need to connect this to an inverter to use it? Or can you use it like any other BMS too, with a dumb charger and inverter?
Hi, it can be used like any other standalone BMS, it doesn't need the communication to be connected to the BMNS for it to work, however you'll need to set the 'dumb' charger so you don't overcharge your battery/cells and set the Inverter to stop discharging the battery before it gets to low.
@@GrantBurton thank you!!
hello, is it possible to use this new-style BMS on electric bicycles
I’m not 100% sure what all the requirements for a BMS on an electric bicycle would be but I guess it would work… it basically has all the same functions as the other ‘non inverter’ BMS with a couple of additional features… but I don’t think these extra functions would need to be used.
The downside is that the Inverter BMS is much larger and I would think that space on an electric bicycle is at a premium.
Are you busy building an electric bike?
I ordered on Aliexpress a few days ago, it is already on the way, after I realized that it is designed for solar panels and performs a lot of functions, now I will have to study the bms before connecting
Anyway, thanks for responding.
@@ДенисШапшников It's a pleasure... let us know how your project turns out.
I will definitely tell you, but it won't be soon.