No external power neede other than the battery cells.
Are you using the OEM wires and all modules connected? How does your RX lines look in the scope?



Thanks for the reply, I found the main problem, I had the transmit from the master to transmit on the slave "Doh", I've corrected it and am now ...

Hi,
I have been following this subject with interest for a while now as I am using Kia Niro/Hyundai Ioniq PHEV batteries for a solar energy storeage system(personal use), I have just built the BMS master following the drawings kindly shared by bexander(very much apreciated thanks).
unfortunately I ...