Battery Charging Properly

[pwfarnell]

The batteries are full, they are at 14.4V according to the SmartShunt and the MPPT is saying it is pretty full. I do not think you have a charging issue, I think you have a SmartShunt measuring issue not measuring the solar input so it is not increasing, nor setting to 100%. I have a feeling that you have connected the negative wire from the MPPT direct to the battery negative, this wire needs to go to the SmartShunt system terminal so the current flows through the SmartShunt so it can be measured. See

Shunt / battery monitor not reading the correct SOC/ Amps, missing solar, decreasing daily or other misreading problems

This topic covers the SOC / Amps reported by BMV battery monitors, SmartShunts, Lynx BMSs and Lynx Shunts and will just be called shunt below. It is also assumed that the shunt is monitoring the domestic / house / cabin battery bank and not engine start / bow thruster / winch / caravan mover battery banks. The problems may be one or more of the following The SOC decreases daily despite the solar charger or other charger(s) working. The SOC increasing when discharging and falling when charging…