Eli5 How do hybrid solar systems work

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To be more specific, I have seen when solar is installed in a home, the output from the inverter is fed into a breaker which is attached into bus bar in the service panel and the mains remiain live. How does the system decide where to draw power from? How does it know to use power from the solar panels/batteries but then use power from the grid when solar/battery power is unavailable?

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