Soc will not show an accurate percentage

[pwfarnell]

The SmartShunt should he working reasonable well. The discharge floor for lithium is typically 10% or 20%. If your system is going dead at 48% then you have some serious problems. Have you checked that each of the 12V batteries in series are balanced because one poor pack going off line because it is not balanced would be an issue. You really ought to do a monitored draw down if you are losing power at 48%. The other possibility is you have not wired the shunt up properly a d you have some power draw from the battery that is not being measured or you have a large zero error. See the manual for zero current calibration and this link for wiring.

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…