As Mike pointed out, in PV watts one sets the DC size, and cannot explicitly set the inverter capacity. Changing the DC/AC ratio from 1.2 to 1.5 is implicitly decreasing the inverter max output by 20%.
Example: DC 4.8 kW DC/AC ratio 1.2 => inverter is 4 kW DC/AC ratio 1.5 => inverter is 3.2 kW Smaller inverter = more clipping DC/AC ratio 1.0 / 0.8 => inverter is 4.8 / 6.0 kW Less production because of inverter efficiency curve - inverter efficiency varies with load. Antony Tersol
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