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Yes Bo is correct in what he says, another thing about upsized inverters is they apparently degrade the efficiency of the system so get an inverter to match the panels.
What the panels produce is used by the house first and any excess is what is fed back to the grid so you could conceivably have a situation where the house is running on half and half so to speak where everything the panels are making is being used but the house needs a bit more so it's pulled from the grid at the same time.
And of course it also works the other way round as well when feeding back.
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