Man I'm almost retired and would love to be able to do what you do. I learned solid state electronics and later PLC programming but hacking like you're doing is way over my head ATM. I was thinking of something simpler like a programmable Watlow temp controller I used n the 90's. Simple...
Have you eliminated the heating issue if over 13.2V? I'm looking for solutions to only heat when the cells are below 35F or AND charging voltage is present. Also need a BMS capable of interrupting 1000 amps. None of the JK units that I'm aware of have an output you can program for...