SoC not updating data upon alternator chargin

[pwfarnell]

Simple one seen often, answered in the FAQs in the sticky post at the top of the DIY section. Your chassis connection to the service battery needs to go to the system side of the shunt. The alternator charges through the chassis so it bypasses the shunt.

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…