
Development: Design considerations of photovoltaic systems 149
All trackers require a motor or a hydraulic system to enable the motion of the
system, with few exceptions. Most commercial systems make use of electrical motors
connected to auxiliary power lines. These auxiliary lines take power from the grid,
not from the photovoltaic system.
The HSATs are the most widely used trackers in the North American market.
Increased energy yields over fixed mounted systems range from 15 to 30 percent depend-
ing on the solar resource available at the location of the project. In these trackers, the
modules are mounted on a horizontal structure parallel to ...