JK BMS Screen Comparison and Test - EXPOSING Problems??
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- čas přidán 5. 09. 2024
- Testing and comparing JK BMS screens connected to the new JK Inverter BMS. Problems identified... can they be fixed with software updates? or is it a hardware fault?
After seeing my review of the JK Inverter BMS, www.lithium-cells.co.za sent the large touch screen to me to test and play around with (I bought the small screens from them about a year ago), and they also gave me four promo codes to share with you, to use on their online store.
They have said there is 10% off for the first 4 people that use the promo code.
Use promo-code BurtonBuilds2024 during checkout.
If anything changes, or they give me additional promo codes to share, I'll update the description or leave them in the community section.
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The battery used to power the screen is a BlueNova 13v LiFEPO4 battery by the company @bluenovaenergy8352 @bluenovaenergy8352I purchased this battery a while back and I'm fairly happy with it so far.
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thank you for the video. i have a 4.3 screen and didn't know about the always on option. i switched it off and my screen works normal.
Thats good news, thanks for letting us know.
Thats really annoying with the 4.3 screen as mine discharges the life out of my battery. I suspect its because I had to make an extension cable for it. You can cut the white wire and make a switch for it, which turns the screen completely off and on again.
Hi Andy, thanks for the tip about the switch. I'm not sure how extending the cable would cause additional power draw on something like this, unless something went wrong with the extension... I suspect it would be something else though.
@@GrantBurton it discharges every few minutes when the screen is connected much faster than it does when it's disconnected. I'm due to reconnect it back on the boat soon. I'll let you know what i find and run a clamp meter on it and see if it's drawing any unusual current.
@@GrantBurtonwhere did you get a 3m cable from?
I just bought 2 of the 4.3 screens and they work directly with a 16 cell 48 volt pack. no need to run a 12 volt power.
Therfore when i push the off button the screen turns off, untill i restart the BMS with the push button.
I looked at the packaging and can't see any version numbers.
Hi Jeff, thanks for letting us know. I think the screen I have is just an old version.
No - the BMS has a separate DC output that the screen plugs into. I don't think it accepts 48-60V directly.
Mine as well. I have 16S LiFePo4 105A EVE cells and connects directly to the BMS port and power the screen without problem.
@@DroneSurf Thanks for the info 👍
me too. have 2 4.3"-screens and they work perfectly with the 16S-power packs...
now eel and another supplier came up with vertical and horizontal 16S-boxes where the big screen is now integrated.
The information of some chinese shops selling the 4.3" JK-screens that it runs only on 12V is false...
I got the same display and the JK inverter BMS but the cable doesn't fit into the BMS, because there is one pin more ...
My screen's plugs have 6 wires and 6 pins... how many do yours have?
I have the newer screen that powered directly from the BMS (24v system) is there a way to turn off the screen or an option to go on sleep mode?
There is only a 'Display always on' setting in the Control screen in the BMS app (version 15.27). Isn't the screen supposed to sleep / turn off by itself, and then wake again when there is a charge or discharge (thats what my small screens seem to do).
As for the screen blinkng problem, I was told it's a firmware problem, so no solution as firmware of the screen / BMS is not upgradeable, at least in the JK B2A20S20PR that I have
Hi Andrés, thanks for the comment.
Have you tried the inverter BMSs' in parallel, and then try to see them all in PC software v2.7.0? The CAN connection to my Victron Cerbo works well with my 4 JK BMS's
Hi, yes, the JK Inverter BMSs are running in parallel and at the same time, I was able to plug in the USB to RS485 adapter and use the PC software to view the data. No settings could be changed but I could see the realtime data for both batteries (address 0 and Address 1). The data seems to refresh every 7 to 8 seconds. The only data that was not working is 'Battery Capacity' and 'Remaining Capacity'... both showing zero on the PC software but showing correctly using the phone app. SOC Percentage shows correctly on PC software though.
Normal there is only one cable needed to connect the display to the bms. Then the display goes to sleep.
I like your reviews👍🏼
@@jcgcs Hi Jacco, thanks for your comment. Are you referring to the large touch screen normally having one cable that goes to the BMS? I know the small screen only has one cable but my large display needs to be powered separately... maybe mine is just an older model screen.
@@GrantBurton Yes, the large touch screen
@@jcgcs Cool, thanks for that info... I'm wondering if I cant just connect the power for this screen to where the 'single cable version' gets its power from... I guess the screen will be the same, just a different cable.
I have the 4.3 panel but the symbol that appears doesn't have this cloud, what I didn't like was the data refresh rate on the display, very slow.
Maybe the newer screens have a faster refresh rate? I think the screen I have is fairly old.
@@GrantBurton Infelizmente não, comprei recentemente e a taxa de atualização é lenta.
I've got the small screen and it stopped working a few months ago. the button on the side still functions but does not power on the display. Not sure if its the bms or not.
Hi, I think this is what I have heard is a common failure with these small screens... especially when being 'always on'. The backlight on the LCD stops working (or at least thats what I remember hearing). I don't think it's the BMS.
Do you know if the JK has a precharge function when turning on the bms? Thanks
Where the BMS limits the current while the Inverter caps are charged... I don't think it has this function.
@@GrantBurton thanks. I will hook it up next week and find out. Cheers
Already have it in use and didn't use 12v supply it is supplied by bms and I hope I won't burn it long term.. Bad thing is I can't change monitor sleep sensitivities.. After. 0.3 amps in or out it works or permenantly by app..
I came across a PDF document (published on JK's website) about the larger 4.3 inch touch screen... it shows a minimum input voltage of 6v and maximum input voltage of 36 volts. I haven't tried anything higher than 12v so not sure how accurate that claim is. It also claims that at 12v, the screens current draws is 116mA.
I've also heard that the 'always on' function for the small screen has been disabled by JK... supposedly because the smaller screens were failing when powered on all the time (I can't confirm this though).
The documents for the small 2.5 inch screen indicates that as soon as discharge is greater than 0, the screen will turn on. As far as i remember, both of my 2.5 inch screens (plugged into the Inverter BMS) turn on when the charge or discharge is greater than 0, but they do turn off again after a while.
@@GrantBurton i am sure my 4.3 is half month now connected to bms maybe late version of the older pb series has some kind of converter at the jst style connectors,,, if anything makes a weird smell i ll let ya know... setup reached 57v and will reach a bit more soon.. didnt do propper slow charging high voiltage shutdown yet...keep up man
@@panospapadimitriou3498 Thanks very much. I've see pictures of a third type of large screen... it has a power button built into the right side of the screen. Not sure if it's a JK screen or a third party screen that works with the JK BMS.
@@GrantBurton bought it as a jk from their sellers with the inverter bms but used it on a last gen pb or B only !!! so i guess it is jk or they just run out of stock and restock from no name!!!! yup the buton which i m curious of how it operates .. maybe a tiny capacitor in series making more than the voltage it reads.. it blown my last thin voltage sense and balance cable.... i guess it had to do when operate or else my crimping was too bad!!!...
I’ve been og 2 1/2 years with no problems JKBMS the old style and 4.3”
how can I fix that the 4.3inch screen dosent show battery green but show the percentage
Hi, I don't really use this large display so unfortunately I'm not sure what might fix the problem... I mainly have the two small screens connected (the 2.5" displays).
@@GrantBurtonjust reset the BMS configuration by selecting the type of battery and setup again your Cells amount and AH.
hi, i have the same bms but the battery does not show any bars like yours and the charge/discharge indicators are "OFF" even after turning it on from the app. when i turn those two options on the BMS works also and provides power.
Are you using the small or big screen?
@@GrantBurton big one. The battery is just a red logo but system is working and SOC is also shown.
@@SaberToothSL1 I'm not sure what could be the problem... I guess it could have something to do with the firmware on the older screens not being compatible with the newer Inverter BMS. I haven't played around with mine anymore... just plugged in the small screens and have been using those and all is working well.
@@GrantBurton this is the same thing my installation vendor told me. I will be getting a new screen for this as that's the easier thing to do for now than replacing the bms.
@@SaberToothSL1Nice… let us know once you get it and if it’s working 👍
What is the SD card slot for?
I'm not sure, possibly to load firmware to the screen?
Can BMS charge and discharge simultaneously?
Hi Francis, both the charge and discharge control can be set to 'On' at the same time but it can't charge and discharge simultaneously (as in at exactly the same time)... the battery will either be charging or discharging, but it will allow current flow in both directions 'automatically' if both the charge and discharge control is 'On'. I think thats what you are asking?
is the display-off issue solved already?
Hi Philippe, do you mean for the large 4.3" screen? I think the screen I have is old because I've heard that other people have newer screens that are powered directly from the BMS, and those don't have any problems.
Hernandez Daniel Jackson George Wilson Sarah
I just got the big screen and it is useless. it has no power button for the screen. Just a power button to turn the whole BMS on/off. I still need my phone to change anything. If I need to get out my phone, open the app, from no more than 15 feet away due to the garbage Bluetooth, to turn on the damn display, what good is it. It just blinks of off randomly, always, NO SETTINGS. LOOKS LIKE IT TAKES A mini SD card which it di not come with. NO INSTRUCTIONS. Absolutly useless. I so mad . while everyone here, pretends to be thrilled to loss money. I WAS, AND STILL WILL BE , JUST USING AN OLD CHEAP PHONE THAT I LEAVE NEAR THE BATTERY. .
Hi, I’ve been using the small 2.5” screen for almost 2 years now and it’s been working perfectly, and also has a BMS power button on the side… only shows basic information, but that’s ok for a quick look when walking by, anything more it’s better to use the app. I’m not sure if the new large screens are trouble free with the new BMS’s (I assume they should be), but the older large screens seem to be problematic with the new Inverter BMS’s… maybe I need to check mine again since updating the BMS firmware.
So stupid to have to get your phone and go to the app with all the info you bought the screen for. It is useless. the "always on" or at least an ON BUTTON needs to be on the screen.
I've been pretty happy with my small screens so far, they have an ON/OFF button on the side of the screen with a basic info display... anything more and I just go to the app.