Are negative values correct when just charging battery?

[pwfarnell]

The BMV normally shows positive when charging and negative when discharging. Have you got the shunt wired the correct way around with all negatives to the shunt system side and only the shunt connected to the battery. The other issue may be a slight out of calibration error, the manual has a zero current calibration method.

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…