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AC coupled Fronius and Quattro, Fronius tripping on lower loads

Hi I have a problem on an AC coupled system with a generator as ac input and fronius on ac output. All works perfectly fine when the loads are high and as soon as the loads drops to around 700W the fronius trips and no errors showing on fronius. When the fronius startsup again the Quattro Humms and then again it trips the fronius. Can you please help me on this

AC PV CouplingFroniusQuattro-IIac ignore
2 |3000

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