That is nonsense. Best thing I did was a shunt delete. Voltage is king SOC does not mean anything. If exports are working and voltage is 56.5V the battery is full. Or if the battery voltage is 55V start reducing the charge current. From my experiance with a 450/100 and 100/50 100/30 there is nothing more reliable.
I doubt you will be able to get a curve like this with a shunt I was never able to. Only system that hit full charge with the weather was my 12V. Edit 24V hit 100% the other day as well after being low for many days have added it.
12V
24V
