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We moved around some circuits in the panel to ensure all critical circuits are on the same phase. This is not important if you will power both phases.
Connecting to the Panel
To connect our inverter to the panel, we simply connected our inverter to a receptacle which was running on the desired phase (L2 in our case). Ideally, this receptacle should not be on a circuit containing a GFCI or arc fault breaker. It will still work but if the GFCI/Arc Fault trips, you won't be able to reset the circuit.
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