Can not get the smartshunt to autosyncronise

[pwfarnell]

Two thoughts which I have seen before.

1. Your MPPT is going to float before the synchronisation so the battery current goes negative before the 3 minutes are up. The SmartShunt stops counting as charge has stopped. The battery current has to be below tail current AND above 0 for the 3 minutes. Either make sure your MPPT tail current is lower than 2% or the absorption time is long enough or try 4% on the SmartShunt.
2. The SmartShunt is counting back up to 100% before it gets to the auto synchronisation, hence it does not count as an auto synchronisation.

Your SmartShunt settings seem OK.

More info in the following link although this is not your issue

Battery monitor jumping to 100% or reporting a high SOC with low Volts / the BMS shuts down

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…