A student asked me a question about the inverter output that I could not answer to my own satisfaction.

Why does the PV inverter (connected to the service panel) feed loads inside the building first then send excess power out into the grid?

Or, to put it another way, how does this dinky little 3 kw inverter push power out into the grid working against all those megawatts?

I could take a S.W.A.G. on this & I might even get it right, but I would like to know for sure.

Tom

Few things are harder to put up with than the annoyance of a good example.