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The figures displayed in your AGL IQ show the total surplus power that you've not used in your household and have instead exported to the grid.
Can I ask to confirm if the figures shown in your Fronius app show the total power your system has generated overall, or the total power exported to the grid?
No Worries Kai!
In this case, the differences in the figures in your AGL IQ (power exported to grid) and Fronius app (total power generated) would be the amount of energy that your system has generated that you've then used within your property.