A lot of mis-information on the net about active balancers & this puts it all to rest. Great program you have there on your PC too👍 Thanks heaps.

Respect

That is an excellent explanation of how this balancer works. Thank you very much for taking the time to explain it. I was hoping that the board had some means by which it would shut itself off when the balance was within specification, but that may be wishful thinking. I would like to leave the balancer connected with the BMS, but I was hoping it go to sleep when not needed.

shared for us this circuit archive, very good your apresetention

Did the online store get taken down? I'm getting "Sorry, this store is currently unavailable." when I click on the URL in the description.

Wow, thanks for sharing, just love it :)

Could you have used a B&W sensor and a color filter wheel in front of the camera to take 3 exposures/frame and then merge them later on? For the alignment maybe leave a gap in the wheel so that only a B&W image is captured for the sprocket detection and when aligned capture R, G & B frames.

Does this support an external contactor?

Hi Stuart, Nice project. I followed the instructions but don't see a "jlcpcbassembly" branch, but "MCP1502T-45E".

Hey Stuart, love your work! I'm currently in the process of building a LiFePO4 pack from CALB cells. I was thinking about using your diyBMS system for controller/managing the cells. However, I didn't want dangling off the side controllers for each pack. (Currently only 1P, expanding later). It was suggested I could potentially use the Leaf monitors to connect to the top of the cell. I also didn't want to run a bunch of balancing wires. Will these still work with the V4.90 board/firmware? Is there another design you would recommend? Thanks

Hey there, the shop site is down, will it come up again?

Could you tell me how the inverter behaves when it is night and the batteries are flat? Does the inverter consume energy from the grid?

Hi like to connect with you sir , I am also trying to make same circuit my question is that if you turns the gate on how can it charge the battery ? every mosfets gate is turned on at same time how it is possible ?

What if a boost converter or jewl thief is used to charge the capacitor or the low cell? If the capacitor is charged to 4.5-5v or even a capacitor doubler, charge two capacitors then put them in series to charge a cell. Its going to cost space and components, maybe it is worth it if it can work Soo much better, having a boost converter or jewel thief making noise may not be so acceptable. However a fet switching caps in series should be much more welcome.. possibly use a small micro controller to discharge the cap before connecting the call to charge it , so the high cell charges it faster. Then going in series as it connects to the low cell. I wish i had more knowledge about electronics, i could have started learning 30-35 years ago and know a ton more! Thank you soo much for all the effort , and for sharing this awesome project!

Great work. I am about to setup my own project with this knowledge. By the way, the second part of your Innsbruck movie is actually Salzburg in Austria.

these seem to come in different current ratings.. Should I be choosing one based on the overall size of battery or individual cell capacity or the max differential it could be shifting between cells (C rating ) ? or

Hey Stuart very nice update on the new boards. Amazing job on the instruction video as well. DIYBMS has got to be the most affordable and most feature rich BMS out there period and its all open source and open hardware to boot. Do you think you can add external AC CAN charging support. The most affordable and powerful one I can find is the TC Charger for 48v systems. tccharger-3.3kw-hk-mf-48-40-obc Would be nice for DIYBMS to have external AC CAN charging support. You can contact them for the protocol this is the official unit and its on its 4th generation

All sold out.

Thanks for great work still waiting for an update when these will be available on the store .. and the controller.

Stuart, this might be a really dumb question, but I can't find the DC input voltage range for the 4.90 monitoring board listed anywhere. Is it 5V like the controller? Also, is there a place where data-sheet like information for these boards exists? Thanks in advance, you've done an awesome job with this project and the videos are all super helpful.

I am working on a project that uses 21700 batteries in a 6s2p setup and I want future expandability up to 6s4p. I love your project and I am looking for something similar that would support my project and allow direct monitoring of each individual cell. It looks like this board requires a minimum of 8S. I am still digging through all your GitHub files but do you have something that may work with my project?

Hello, I know that we can add a CurrentShant.. but we can limit a current separate on charge and discharge or disable one of them ? I think DiyBMS is like MultiVoltmeter with addons as core system. This is critical for me when I think about doing HV system base on DiyBMS (192V for APC UPS).

Thanks, Stuart. Looks really good I may buy one to replace my 4.1 boards. Andy will give a good review. Your boards are bulletproof.

Awesome product! Thank you!

Thanks again Stuart for your great work, great video

I wait until 'OffGrid Garage' do a testing of your boards, after ppl will go for DiyBMS more oftern. For me best pro of DiyBMS is that with >4 of them we can switch from LV 48V into 192V who can replace a AGM battery pack in many UPS device and this is often first low level to onter HV PV Inverters. Many persons who have a car battery with broke internal BMS can use DiyBMS to reuse a battery and communicate with inverter . This is one of best pros of DiyBMS for me.

awesome project....can i put 6 of the to monitor a 96cell battery? for an ev car....i just need to balance and monitor

Amazing board and amazing work 🎉🎉

what program is used for the simulation? I am building a 48V battery pack that has 14 battery modules in series.

Thanks. Very helpful.

name of this simulation program

Hey Stuart, which connectors do you use for the UART (TX, RX) connection on the cell module board. The reason I am asking is because I can't find the connectors with the same pitch as in KiCad? Thank you

Which kind of JST connector does it have?

Hi Stuart. I believe my old Pylontech extra 2000 batteries need a Firmware update. Pylontech technology's are not helping as out of warranty.. I have managed to get a little bit of charge in them by setting my solis inverter to lead acid.. but am still getting can com fail. The batteries haven't been used for a few years as have only just got a house worth putting panels on. Do you have any idea where I could get Firmware for the extra 2000 batteries !! Regards Mark

What's the practical difference between the flying capacitor type (show in video) and the inductive type (the tiny type with inductors)? Is there any real reason to use one over then other? I know sort of the difference of using inductance vs capacitance, one uses capacitors, one uses the back EMF from inductors and changing currents like a buck or boost converter. But I don't know why you'd use one system over the other for an active balancer.

@StuartPittaway Just purchased the 4.61 Controller was planning on using it with a 96s Lifepo4 system. I just watched this video and reading the comments, I thought the controller wasn't limited by voltage but in away it is because the shunt is only capable of 85v.. I'm not sure what to do now, I thought this BMS was my solution.. Is there a way that I can incorporate something like the VISHAY HV-IBSS-USB shunt? This thing is pretty awesome, up to 850v.

Could this be modified for 16mm?

Great job Stuart. You are running out of stock fast ! Looking forward for you to restock to get few of your your "all-in-one"s

Thanks Stuart

what is the supported voltage range again ? would they work with Sodium Battery ? been swapping out my lithium

Just a note, still had trouble programming the boards this arvo, I have had these boards sitting around for a long while and gave up on them from JLCPB as no good, but I solved the problem, the RX and TX pins on the USB adapter were opposite, so had to join TX to TX and RX to RX, now I have the 4 blink LED error.

Hello Stuart. Do you have a battery charger solution to complement the DIY BMS? Thanks.

Need more of them in your store, Stuart ! :-)

It would be nice if the usb converter board and socket were included on the monitor board. That way, in two years, I won’t need to hunt down the pieces needed to reprogram it.

Thanks Stuart I have been looking forward to this video on the all in one board

Looks really good.

do the new 4.9 dont have two options for refrence chips like the first release one? now all with 4500? so the old ones must flashed wit 4096 if this chip is fitted?

What is the power consumption of the boards? I was thinking of doing the individual monitors, but the more I think about it, it's likely that this new 16s board uses less.

How is the depth of field on the camera? Is it super shallow? Or is it pretty forgiving?

Дорогой друг.Всем известно,что на переменной частоте ,емкость и индуктивность имеют разное результирующее сопротивление для протекающего через них тока.Неграмотные китайцы притулили на эту схемотехнику длинные провода мелкого сечения.Поэтому это работает в часть силы.Для обеспечения большого тока отдачи,выводы на самом аккумуляторе необходимо зашунтировать несколькими смд керамическими конденсаторами по 1 мкф.Обрати внимание,что аккумулятор может скушать большой ток,только при большой разнице напряжений.Гораздо правильнее ставить вместо аккумулятора резистор и смотреть на нем напряжение (ток) при тесте.