Solar Exposure ranges from 100%, meaning fully exposed to direct sun at all times of the day and year, to 0%, meaning always in shadow. Solar exposure represents approximately how much solar energy is received by the surface compared to a solar tracking surface with no shading and perfect orientation.
A value of 100% would only occur for a tracking solar array, and 0% would occur for down-facing and/or highly-obstructed surfaces. Surfaces always in full shadow (0) are not considered for PV analysis and are not listed in the table.