HOMER Energy Support

Solar radiation scaling

Last Updated: Jul 25, 2016 02:25PM MDT

The issue of scaling the solar resource data is independent of the PV array.  By "fixed location" I mean a particular latitude and longitude, but especially latitude.

The latitude has a strong effect on the amount of solar radiation received at a site, but at any particular latitude, what determines the quantity of solar radiation received at ground level is the cloudiness.  The higher the cloudiness, the lower the average solar radiation.  At a particular latitude, the difference between a sunny site and a cloudy site is not the intensity of radiation on a clear day, but rather the number of clear days.

My point is that HOMER's simplistic approach to scaling the solar radiation data is to change the intensity of radiation in each hour, without changing the patterns of cloudiness.

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