About Solar Energy | PV Technology: Cells and Modules | Solar Radiation | Solar Trackers | Solar Farms |

Characteristics | Solar Constant | Solar Irradiation Modelling | Solar Orbiting | Solar Sun Position | Atmosphere | Tilted Surface Solar Radiation | Solar Orbiting | Energy Yield | Standard Spectra | Radiation Effects & Solar Power |

Dual Axis trackers have two degrees of freedom that serve as axes of rotation. The axis that is set with respect to the ground is considered to be the primary axis. The secondary axis is the axis that is referenced to the primary axis.

Dual Axis trackers are able to follow the sun both horizontally and vertically, which allows for optimum solar energy. There are several implementations of dual trackers:

Azimuth-Altitude Dual Axis Tracker (AADAT)

This type of tracker has its primary axis set vertical to the ground. AADAT systems usually use large ring that is mounted on the ground, having the array mounted on a series of rollers. This allows an advantage over the Tip-Tilt Dual Axis Tracker (TTDAT) since it can distribute the weight of the array over a series of rings, allowing for larger arrays to be supported.

AADAT systems cannot be placed closer together than the diameter of the ring, which can reduce system density and cause inter-tracker shading.

Tip-Tilt Dual Axis Tracker (TTDAT)

This type of tracker has the panel array mounted onto the tip of a long pole. The East to West movement is typically caused by the rotating array on the top of the pole. These trackers would need to be placed at a low density, in order to avoid one tracker casting a shadow onto another.

Dual Orbit Solar Tracker

This is a type of tracker that stands no more than 8 ft high and can provide large amounts of electricity, either directly to the end user or into the electrical grid. It offers from 10kW to 80kW per array.

+ 2-Axis Tracking System
+ Dual Axis Azimuth & Elevation Tracking
+ Generate a large amount of electricity either directly to user or to the electrical grid