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In Generator:PVWatts, how do you know what surface the solar panels are on if you choose TiltAzimuth for Array Geometry Type?

Also, is the size of the solar array determined by the surface it's on?

I've tried changing the Surface Name input, which clearly has an effect when Geometry Type is surface, but isn't required for TiltAzimuth. Even then, though, the output doesn't seem to be determined by the size of that surface, only by its orientation. Are the orientation, shade, and rated capacity all that determine output of the panels?

In Generator:PVWatts, how do you know what surface the solar panels are on if you choose TiltAzimuth for Array Geometry Type?

Also, is the size of the solar array determined by the surface it's on?

I've tried changing the Surface Name input, which clearly has an effect when Geometry Type is surface, but isn't required for TiltAzimuth. Even then, though, the output doesn't seem to be determined by the size of that surface, only by its orientation. Are the orientation, shade, and rated capacity all that determine output of the panels?