16S DIYBMS All-in-one boards

[hallkbrdz]

Stewart has released his initial 16S cell monitoring board design, and it now allows for 4.2v cells. This really makes his system much more attractive to me since I no longer have one board per cell and all the connections required for 42S and larger packs. A little work to complete the assembly and program, but great design and features for the price IMHO.

Anyone else doing a build with these?

 

[amberwolf]

Who is "Stewart", and what website would these be found on?

 

[lnanek]

Hmm, it says all in one, but the video says it still needs to communicate with a separate controller board. So it seems like it's still twice as many boards as a generic, off the shelf ebike BMS. Nice learning opportunity how he describes every bit of the circuit and has hardware and software GitHub projects shared, though. Too bad he seems to be building power walls instead of bikes.

 

[hallkbrdz]

Hmm, it says all in one, but the video says it still needs to communicate with a separate controller board. So it seems like it's still twice as many boards as a generic, off the shelf ebike BMS. Nice learning opportunity how he describes every bit of the circuit and has hardware and software GitHub projects shared, though. Too bad he seems to be building power walls instead of bikes.

All in one cell monitoring board, as long as 16S works for you. Still better than a board per cell. The seperate master / slave cell arangement works best for things with removeable battery packs where the slaves are in the pack.

Having looked at many of these things in depth, I'm reasonably impressed with his product. Much more so than any generic BMS. I'm not sure it's quite to the level of something like a Dilithium or Orion, but at least you know how it works and what limitations it has. And you are free to modify the design or software to suit, which is nice.

Who is "Stewart", and what website would these be found on?

TLDV; stuartpittaway - Overview

 

[hallkbrdz]

This 16S design should easily be extended to 24S by using a 6803-4 and just adding 4 more channels for each chip.

But first I have asked some more questions about canbus charger interface code, contactor support, and the use of Hall effect current sensors, all of which I will need for even a 24S build. It does seem he is now aiming the design at battery walls. Not a bad thing in itself, but not what I need at the moment.

 

[Kta22]

Stewart has released his initial 16S cell monitoring board design, and it now allows for 4.2v cells. This really makes his system much more attractive to me since I no longer have one board per cell and all the connections required for 42S and larger packs. A little work to complete the assembly and program, but great design and features for the price IMHO.

Anyone else doing a build with these?

I've developed an all-in-one BMS board for LiFePO₄ batteries, and while it's functioning well overall, I'm somewhat disappointed by the lack of true current and voltage protection with proper cutoff mechanisms.
I'm curious—what approach are you considering for implementing this functionality? Are you planning to use contactors, or are you leaning toward a back-to-back MOSFET configuration?