BMV 712 Smart Shunt Incorrect State of Charge

[pwfarnell]

Your settings are fine, charged voltage is ideally 0.1V below absorption set on the chargers.

Your problem is the Inverter must he connected to the load side of the shunt. The shunt counts power in during charging and power out when using loads to get to the SOC, so you have not been counting your inverter load.

See the diagram in the post below

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…