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3.2 Operation Modes (after powered on)
Press the Power ON/OFF button to power on the inverter and the inverter will
automatically enter either of the operation mode according to the condition of
LINE MODE1
AC input power is present but there is no PV power (e.g. nighttime). Load is
supplied by AC input power directly.
LINE MODE 2
Both AC input and PV input are present. Load is supplied by either AC input
or PV input depending on the priority switch's setting.