The only way to reliably get the SOC correct is to perform a full charge where the controller reaches float and the SmartShunt synchronises to 100% or you set it to 100% mamually.
As you have made one of the two common mistakes, here is a link to the other, not setting the SmartShunt settings properly. Both ate covered in the manual.
This topic covers the reported SOC being out of sync with the actual battery voltage or state. It covers 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 and is often linked to mobile applications with small solar systems.
The SOC jum…
And for completeness
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…