OK. So, there is an App for both the MPPT controller and the BMV. Just clarifying ... because it is the BMV that tells you your battery SOC, not the MPPT.
I agree on SOC but I have watched just a volt meter long enough that I have a good idea where my battery's health is. That and it is on solar all the time. 250w - Victron 100/20 - two 12v AGMs. My batteries are original to my 2013 camper so I have been watching voltage drop when heater or fridge come on. Coming up on 7 year old batteries in a few months. Have to decide if I want to spend the $$$$ for lytham batteries.