DiyBMSv4

[Stingy49]

Pretty neat for those of us comfortable with assembling pcbs and loading Arduino code.

Fully modular, web interface, programmable relay outputs.

Here is someone's video on it vs the last gen.

A link to the GitHub with firmware and boards. https://github.com/stuartpittaway/diyBMSv4/blob/master/README.md

Also the inventor's release video.

Sorry if the links are broken, posting mobile.

 

[Keith_PDX]

Can you buy completed boards? All I see is the bill of materials on the github.
Thanks for sharing.

 

[Stingy49]

Not that I know of. Gotta assemble them yourselves. The creator said he was in talks with some mfgs about getting premade boards.

 

[electric]

Something to watch out for in the distributed BMS design using serial comms between cell boards. Under heavy inverter load there will be tons of ripple current thru the battery and BMS comms could get scrambled. Many BMS designs like this work perfectly on the bench with simple DC loads, but when you add a high power inverter, all the comms go to hell.
I'm not saying this specific BMS is like that, since I haven't analysed its design, but it's a common issue to watch for.
Ask yourself why bother with distributed boards when you can get a 16S single BMS board, which doesn't have such issues.
I'm not promoting anything or putting anyone down, just sharing my experience.

 

[Stingy49]

I totally hear you. Actually the major change from v3 to v4 was a comms issue. The i2c communication was struggling so he switched to opto-isolated serial.

For me the internet-less web interface and programmable relay controls are a big selling point versus the off the shelf stuff. Same with open source code so I can write my own logic if it doesn't quite have what I need.

I ordered enough components to make 25 boards and 2 controllers yesterday. I'll order the PCB's sometime today. I'll let y'all know how it works out for me. I'm doing 1 bench-top 12v setup and a small house 48v setup.

 

[Keith_PDX]

I think there's a market for easy-to-do makers kits for these. Gimme an easy button, I'd enjoy the experience but don't have the time to build or deal with loading code. I'm sure I'm not the only one who feels this way. I enjoy the open source natural and customization but lack the spare time.