- Irradiance is the sun’s power in kW/m2.
- Insolation is the sun’s energy (power integrated over time) measured in kWh/m2.
- Solar access is the percentage of insolation available to an array—shading versus no shading. Only insolation and shade within the array’s field of view is considered in calculating solar access.
- Azimuth angle is a compass heading.
- Elevation angle is the angle above the horizon.
- Magnetic declination is the deviation of true south from magnetic south.
