Didnt know this would be publish to public.
How do you send private messages??
Gday Brett
Thanks for the email, its great talking to other Australian who know our supply problems and other issue we face.
I am in Melbourne, VIC. Wow $35. i was hoping to get my below $20. I have done my components list and i have that below $15. I am a bit worried about SMD, never soldered them before. So i am wondering how many will end up in the bin.
Couple things that i would like to know is where did you get the solder paste from and the small needle points?
Also did you find an order to solder the parts in which was easy?
However when it comes to putting it all together and getting the modules up and running i recon i will need some help when that happens.
nice project (I learned about it via the GreatScott video), unfortunately my hands are not steady enough to make SMT soldering a very practical thing to do, is there anyone who is manufacturing these?
After the GreatScott YouTube video, this project has a lot of interest once again!
Today I’ve merged the code @Colin_Hickey produced back into the core GitHub repository and also made the smaller PCB style the default.
Just so you are all aware, there isn’t anything inherently wrong with the v3 design - however I am working on a v4 which uses a different chipset and module design, the main benefit of this v4 model is the reduced power consumption - less than 1mA compared to 10-12mA on the v3.
V4 is not ready for public use yet. I’ve no confirmed dates for release and I do this on a part time/project basis and life/work gets in the way
Hey, GreatScott bought me here, Im coming from the ESK8 community and there is a “shortage” of small bmss like yours that have a feature to edit the voltages and see them without taking the whole skateboard apart and measuring by hand
Could a 10 and 12s version of this bms be made easily?
Yes, there isn’t really a limit on the number of modules you can string together - however you might find the physical space is more restrictive on a skateboard so no room for all the PCBs
Nice idea to reduce power consumption! And hugh thanks for this wonderfull project!
But actually 11 mA * 3.7 V * 14 modules (for my 14s li-io-setup) means 0.57 Watts. For me this is fine as I use it for my DIY-powerwall. I will lose 5 kWh per year. Thus, not even one 1 EUR per year. So I keep on building the v3 (already ordered the pcb’s…)
What I really would like to see are two dry contacts as many inverters have two input ports. One to detect a high cell or too much heat and one for low cell.
Any idea how to add this feature?
You can use the controller - it has several unused I/O pins available. This would probably need to have an interface board made with optoisolators and relay components connected.
The controller software would also need to be changed to spot the conditions when you want to shut things down (or start things up!)
Not that difficult in reality, but not something I’ve got spare time to take a look at now.
