SOC/battery voltage desynchronization problem

Q&A and troubleshooting
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1

Hello,
3 phases installation Multiplus II 48/5000/70-50 with Batteries 14kVA
The smart shunt data is incorrect and shows a discrepancy between the SOC and the voltage: after synchronizing at 58.4V = 100% SOC, the SOC drops by a few percent every day in a linear fashion, reaching 58.4V = 80% SOC after 8 days. What is the cause of this problem? Clarification: lithium battery, no communicating BMS. Thank you.

2
  1. You have not correctly installed it and have an unmeasured drain. See Shunt / battery monitor not reading the correct SOC/ Amps, missing solar, decreasing daily or other misreading problems
  2. You are not synchronising correctly, see Battery monitor jumping to 100% or reporting a high SOC with low Volts / the BMS shuts down
  3. Your settings are for lead acid and are not suitable for lithium, post screenshots of your settings.
  4. Very unlikely, but you have a zero calibration error. Procedure in the manual to reset this, needs everything disconnected. This is a very rare thing so do 1 to 3 first.