I think it is quite easy as it work as a switch. You start it with “Durchführen” and stop it with “Abbruch”.
There is a binding for aWATTAR (aWATTar binding: Anybody already working on it?) that get all the prices for the next day and also calculates the best time range and provides a switch that turns on when that time range start and turns off when its over. Everything else is doable as a rule.
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