Repeated charging and discharging when battery is full - multi voltage reading inaccurate?

[TheTerribleTriplet]

@plonkster explained this the other day.

Grid import here seems higher than needed?

Oh hang on… your minsoc is set to 20%. This is a completely different issue. So let’s start with the basics. The MPPT doesn’t care about the battery’s state of charge. It doesn’t even know what the state of charge is. It cares only about the voltage. If the battery voltage has reached the voltage the MPPT is aiming for, it will stop charging. It has to, otherwise bad things happen. Conversely, the Multi will simply power the loads from the battery. As the battery starts discharging, the voltag…