OK, thanks. I could solve this by storing the Watt hours in the first place in the table. I just hoped I didn't have to, since everything needed (power, timespan) is already there and could be calculated. To be correct, I read the Wh from the inverter and calculate the power, since I want to have an idea about the currant solar conditions at the station (I don't have a radiation sensor). This is nice for a day's plot or even a week's plot, but doesnt make too much sense for month or year.
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