Is this normal behaviour? Discharge 31 > 27% within 8 hours and such a difference between charge/discharge?
The difference between charge and discharge is normal. What you see there is the overall roundtrip efficiency of the the system, including every self-consumption (inverter, bms, mppts), cable losses and ofc. conversion losses etc.
80% is a pretty common figure, but not unusual for systems to run bellow at 70ish percent.
4% discharge in 8h? You are meaning during idle? Depends on your batterie size.
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ok, if it is overall, then it should be ok. Thanks!
Capacity is just 6 kWh.
Ok, then 4% is “only” 240 Wh ( 0.24 kWh), divided by 8 hours, that’s about 40 wh, absolutely normal as well.