Great thread. Awesome idea. I just started soldering some PCBs ordered from jlcpcb. Most of the components were sourced from http://tme.eu many times way less expensive compared to Mouser, Farnell or RS. Unfortunately they don’t stock everything needed for this project. Will see how it goes. I’ll be building 7S40P for a start. Testing will be done on 7S10P as it’s already in use.
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It could very well be normal (or a bug) just that I’ve not experienced that (yet!)
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I’ve just published a Youtube video on the history of the DIY BMS and also a new design
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Im a member of diy powerwall myself been watching you video and colins as well.
working my own diypower wall using lipo 3.7v 10ah 20/5 amp discharge/charge looking at the bms boards looks great to test on my system and build a bms with arduino open source other than a batrium.
wondering where i could get 12 boards to build and test.
The design is opensource so you can download the board design and submit that to a PCB factory (JLCPCB is a common one).
Might be worth another video showing how to do that.
this is the first i have heard of download ing the disgn. im new to this site.
To get the pcb files if you download the zip from github then there shall be a folder called gerber under the BMS-Cell-Module-Circuit folder, if you zip the gerber folder up you can then upload that zip file to the the jlcpcb website. I’d recommend jlcpcb as well and using their panalise option then you can get your boards for $2 as they have an offer on and if you choose slow delivery it’s around $8 or so. By doing the options below you’d get 20 boards.
If i were you though i’d wait for the new board design as it’s even smaller though so you could fit even more in the order so have plenty spares or share with someone if you know someone else working on the project.
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Although if you have a 4p configuration the “old” boards fit well on a cell so going smaller is only a good option if it has different functions aswell. And per my understanding its only smaller right?
Correct - although does have different spacing for other types of connectors if that’s important for you
Probably only on a new set, i have 20 boards, 13 are finished. So if i build a second setup i’ll need more boards to get to 13 nodes again 
How the board as it stand handle bigger loads other than an 18650 cell or bank as i have 6 cells in series then paralle 2 packs to make 12 cell bank total 24 cells. But thinking for changing 6 cell parallel by 12 in series. as i see the board would have to run in 3.7v config. what would the board handle if any one has any idea.
Guys is D2 supposed to light up as soon as I connect 18650 battery?
If you haven’t provisioned the module yet - the LED should light on power up.
Shouldn’t be a problem as long as the voltage is with in the allowed range - the size or chemistry of the pack won’t matter.
Hi guys as i live in australia and trying to find parts for the build of the boards but as i have looked so far 5 items i cant find and 3 of the links to parts dont come up with items
But of course I need to put Arduino code on Attiny85 for this to happen?
I used ALIEXPRESS for all my items - which ones are you struggling with?
Yes you do - however depending on where you got the ATTINY from it may already have a “blink” type program installed on it which may be causing the LED to be ON.
Get it programmed with the correct DIYBMS code and see what happens
Thanks heaps for that stuart will look there mite be cheaper to get them in bulk form