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Planning a PV sytem for my home. Using microinverters. Output AC is going to go through a backfeed breaker in the Main Panel. All the the videos and things I have read say to put the breaker at the bottom of the bus bar. Except my panel includes the schematic below which calls out the top of...

Awesome thanks for the replies. Makes sense now. I am using the 120% rule. I need a 50A breaker, have a 100A main breaker and the bus bar max rating is 125A. So I will be putting the solar backfed breaker at the bottom of the bus bar (panel has power coming into the top).

It is at the top, power comes in at the top (A/B lugs on the diagram)