![Rolling Eyes :roll:](./images/smilies/icon_rolleyes.gif)
The data bus error was an easy one to miss, but I suppose a little jiggery pokery with the interconnecting leads would have fixed it if it had gone to PCB.
I had a quick look for current sensors (coulomb counting would be nice) but it seems if you need up to 500A then the resolution might not be too good (my zilla z1k has a 500A fuse in it). Luckily with lead acid, voltage is a better indication of SOC than it is with Lithium so that's a refinement for the future in my case
![Smile :)](./images/smilies/icon_smile.gif)