A solar array that follows the path
of the sun to maximize the solar radiation incident on the photovoltaic
surface. The two most common orientations are:
Tracking arrays use both direct
and diffuse sunlight. Two-axis
tracking arrays capture the maximum possible daily energy. Typically, a
single-axis tracker will give 15% to 25% more power per day than a fixed
array, and dual-axis tracking will add about 5% to that. The exact gains
will depend somewhat on latitude and season.
- One-axis where the array tracks the sun east to west – used
mostly with flat-plate systems and occasionally with concentrator systems.
- Two-axis tracking where the array points directly at the sun at all
times – used primarily with PV concentrator systems.
For more information, see solar tracker.
ENERGY AND POWER