Trackers can also be incorporated with pole-mounted systems to increase energy production in areas with wide-open solar windows. AllEarth Renewables offers its AllSun Tracker, a pole-mounted, dual-axis active tracker for 20- or 24-module systems. Dual-axis trackers follow the sun’s azimuth and altitude angle. AllSun Trackers include a string inverter mounted on the pole, and a GPS-enabled sun-tracking mechanism that replaces irradiance sensors common on residential trackers. Array Technologies manufactures dual-axis trackers, as well as residential-scale, single-axis tilt and roll trackers—also known as horizontal linear-axis trackers.
Zomeworks is a long-time manufacturer of reliable, single-axis passive trackers. These passive trackers use the sun’s heat and the weight of a phase-changing gas that flows through tubes to keep the rack following the sun’s azimuth (east-to-west path). Zomeworks focuses on small trackers, made for residential or remote ranch applications.
AllEarth Renewables AllSun Tracker is a dual-axis tracker with pole-mounted string inverter. [Courtesy AllEarth Renewables]
Four Zomeworks passive trackers, aligned from north to south to avoid potential shading from the long shadows each casts in the morning and afternoon. [Courtesy Zomeworks]