Two-Axis Tracking

Two-axis tracking allows the array to be pointed normal to the Sun in order to maximize the irradiance hitting the array.  This results in an angle of incidence equal to zero.

At Sandia National Laboratories, we have a two-axis tracker that we use to characterize PV modules, shown below.

Image of SNL-2-axis-TrackerB1-300x200-1
There are a number of different types of two-axis trackers based on the orientation and configuration of the axes of rotation: