An angle correction factor would be pretty meaningless. The panels are on the south facing roof surface and should get the maximum amount of insolation. The angle of the sun relative to the panels is continually changing from hour to hour and day to day.
A panel installed horizontally will get a totally different amount of sun from a panel installed at 90 degrees... if you catch my drift... Also the clouds can make a huge difference in the output. Looking at »lwf.ncdc.noaa.gov/oa/climate/onl···ldy.html it appears that you will have an average of 101 clear, 101 cloudy and 164 partially cloudy days pretty evenly distributed month to month - so expect to produce only 55-60% of your assumed output. In fact this is one main reason for which I passed solar myself - at 55-60% it will never pay for itself in my location.
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