Here is my current flow, which is quite extensive.
First part: Triggers and general decision on battery mode based on current prices. The variable “Ladeleistung Steuerung aussetzen” is true if the car charges at full speed, i.e. not following PV yield. “PV Batterie Gesamtentnamekosten” are the costs for electricity from the battery, in my case I use 0.10€ plus the feed-in tariff (“PV Einspeisetarif”).
Second part: Override the mode in special cases. “PV Batterie Laden vermeiden” will be true if I want to prevent battery charging, i.e. usually in summer when I want to reserve some space in the battery to charge PV yield over the maximum inverter power. “PV Eigenverbrauch vermeiden” will be true if I want to avoid self consumption, i.e. usually in winter, when I want to charge the battery with all the PV yield I can get during times of cheap electricity prices, so I can use the battery when electricity prices are high. And last but not least I don’t want to discharge the battery below 10%.
Third part: Actually setting the battery mode. I also have a “special” battery mode (1.5), which prioritizes self consumption and only charges the battery with excess PV yield, but never discharges the battery. I simulate that by using “Maximize self consumption” and limiting the battery discharging power to 10W (my inverters doesn’t accept lower values).
Enough inspiration? 
