[RE-wrenches] PV watts question

[Antony Tersol]

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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