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Thick-crystalline Materials
Semiconductor material, typically measuring from 200-400 microns thick, that is cut from ingots or ribbons. same as 'Bulk-crystalline Materials.'

Thin-film
A layer of semiconductor material, such as copper indium diselenide, cadmium telluride, gallium arsenide, or amorphous silicon, a few microns or less in thickness, used to make photovoltaic cells. Commonly called amorphous.

Tilt
The inclination of a PV array in the direction of the azimuth, in degrees, in which 0 refers to horizontal and 90 refers to vertical.

Total kWh
The sum of the Locked kWh and Adjust kWh columns.

Tracking Array
PV array that follows the path of the sun to maximize the solar radiation incident on the PV surface. The two most common orientations are (1) one axis where the array tracks the sun east to west and (2) two-axis tracking where the array points directly at the sun at all times. Tracking arrays use both the direct and diffuse sunlight. Two-axis tracking arrays capture the maximum possible daily energy. Typically, a single axis tracker will give you 15% to 25% more power per day, and dual axis tracking will add about 5% to that. Depends somewhat on latitude and season.

Transformer
Steps AC voltage up or down, depending on the application.

Two-axis Tracking
A system capable of rotating independently about two axes (e.g., vertical and horizontal) and following the sun for maximum efficiency of the solar array.