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What voltages did you choose for 20%, 40%, 60% & 80% SOC settings? My understanding is that the method 1 you describe is used whenever Reset Capacity is triggered or a settings change is made or when reaching full (and maybe also when reaching empty). Method 2 is used during normal use...

I just happened to notice that BC0 carried load current so I didn't use it. Since then, I found the wiring diagrams that support what I did. Same instructions here...

I got it here: https://www.pgyer.com/Bzt1 There used to be a link to that site on Jiabaida's website. 3.1.1026 (build 5) 2021-06-05 3.1.1026 (build 4) 2020-12-07 3.1.1021 (build 3) 2020-08-21 3.1.1020 (build 2) 2020-08-17 3.1.1015 (build 1) 2020-02-17

These resistors or maybe diodes look new to V1.7: Re: mounting the LCD, there are tactile switch caps that could be used to raise the switch heights. I've also seen keyhole like cut-outs in acrylic that might work.

From the document in the previously posted link: First, does charging have to be present to meet the Heating On condition? Also, it's not clear to me if Heating On and Off is affected by low temperature protection and recovery settings in the app or not. We know that low temperature...

@Mako74 - We'll all have different opinions as to best settings and how hard to push the batteries etc. so my ideas & settings will be different than others. For 20%, 40%, 60%, 80% & Full, I currently have: Full: 3.45V 80%: 3.332V 60%: 3.293V 40%: 3.29V 20%: 3.24V Undervoltage: 2.9V Pack...

There are buttons for navigating through the screens. View only, no programming as far as I know. LCD turns off automatically after 20 seconds or so. Mounting it shouldn't be too difficult. The supplied wire plugs into the Bluetooth / UART/USB connector. I don't know if that could be split...

I did not expect the temperature switch to be a safety Off switch! Is there continuity between J2-2 & J2-3 when nothing is connected? The Off safety switch does make sense. It's important to have. 35C seems high for heating so it seems that it is dual purpose maybe. For DIY, I had thought...

Function Setting is on the Android app main menu.

When the battery is in active use SOC must be a direct result of the beginning SOC and then coulomb counting. I say must be because SOC% doesn't plummet when a very large load pulls the voltage down. It's smart enough to ignore the temporary voltage drop. I've settled on using - FUNCTION...

I don't see a way to do that.

http://www.jiabaida.com/appdown/xiaoxiang-customer.apk

The instructions here https://www.lithiumbatterypcb.com/product/4s-lifepo4-battery-bluetooth-bms-with-100a-constant-discharge-current-for-12v-lfp-battery-pack/ indicate that BC0 is not to be used but that is a V1.2 board. It also applies to V1.3 boards. I found that the tiny BC0 wire carried...

There's the old xiaoxiang 2.0.1006.4.apk here: https://diysolarforum.com/attachments/xiaoxiang-protection-enterprise-apk.4224/ that gives access to settings. When I switched over to the new green color Bluetooth modules that old app no longer connects to any of my BMS. It worked with the old...

For this particular BMS board, the 5-wire connector is: Pin 0 to ground, pin 1 at 3.2V, pin 2 at 6.4V, pin 3 at 9.6V and pin 4 12.8V. However, I'd suggest not using Pin 0 at all, ground comes from B- buss instead. See...

Try calibrating voltage if you haven't already. Cell voltages, current and temperature can all be checked for accuracy and calibrated.

The BMS would handle a 15A load easily. I've put instantaneous 100A load (toaster oven) on mine no problem. You can add or change the password, might as well try that.

FUNCTION SETTING -> RESET CAPACITY brings it back inline with your 20/40/60/80% voltage set point choices. Tested & confirmed resting voltages accurately reflect SOC (24hrs or so at rest). That's the only time voltage is useful for determining SOC in my opinion. With cylindrical cells, I'm...

Maybe try version 3.1.1015 from Google Play https://play.google.com/store/apps/details?id=com.carplounge.bms It offers full access to settings. Also, there's the old xiaoxiang enterprise version 2.0.1006.4.apk here...

There are blue color and also green color compatible Bluetooth modules. The green color modules are newer I think and have JBD printed on the board. I posted some info here: https://diysolarforum.com/threads/jbdpcb-overkill-bms-bluetooth-mod-and-observations.23124/#post-272932

Yes. Both charge & discharge low temp protection didn't work unless actually charging or discharging. You can temporarily change the temperature set points to facilitate the testing to confirm basic functionality. I worked with alkaline batteries for all that initial testing also, 8 AA...

Yes. (I edited my post to make sense!)

Are you prompted for a password with Carplounge & xiaoxiang apps? Polinovel is view only & doesn't require password.

It's likely a temperature switch and not a temperature probe on the 4 wire connector. Probably not a good idea to put the switch directly in brine. On https://www.wohnmobilforum.de/ I found this link: https://drive.google.com/file/d/1WWIoawTwGnlkrRYxR4b7H3B0cFgkGjOZ/view If it is a...

For anyone interested in the heater connections there's info here: https://diysolarforum.com/threads/testing-jbd-150a-v1-5-low-temp-cut-off-issues-help.19734/#post-230421

Voltage per cell, current per cell & even temperature all need to be calibrated during BMS setup if you want a high level of accuracy. Medium-high end multimeter means little when it comes to accuracy. Meters need to be calibrated periodically. If you're interested in accuracy then maybe buy a...

I have three blue PCB BT modules & one came with a flexible wire antenna soldered on. Performance wasn't great, a bit more range on the antenna equipped module, but range was poor compared to other BT things I have. I took a chance ordered the green PCB BT modules from JBD. Much better range...

V1.5 boards have a MOSFET that my V1.3 boards don't have. I wonder if the additional temp probes you have allow a heat pad to work? The MOSFET might cut or allow power through H+/H-. Have you tested H+ & H- with a voltmeter? If 0V then maybe try putting a temp probe in ice to see if that...

Clearing app data also works to get the new name to show. That's a bit easier/quicker than uninstalling the app. It works the same in v3.1.1015 and v3.1.1026 for me.

The Carplounge app on Google Play: https://play.google.com/store/apps/details?id=com.carplounge.bms works great with this BMS. Full access to all settings.