Solar Array Orientation Map for the United States
The directions of magnetic South and true South differ from one another depending on geographic location. This variance is called declination.
Check the declination for your region in order to extrapolate true South from a compass heading of magnetic South. The map below shows the magnetic declination for the US.
For example, true south in central Texas falls between the 7 degree East and the 8 degree East lines. This means that, for optimum exposure, the solar array should be aligned 7-8 degrees east of magnetic south (on a compass).
