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CIGS
Copper indium gallium selenide (CIGS) is a new semiconductor material composed of copper , indium, gallium, and selenium. The material is a solid solution of copper indium selenide (often abbreviated "CIS") and copper gallium selenide, with a chemical formula of CuIn x Ga (1-x) Se 2 where the value of x can vary from 1 (pure copper indium selenide) to 0 (pure copper gallium selenide). It is a tetrahedrally-bonded semiconductor, with the chalcopyrite crystal structure, and a bandgap varying continuously with x from about 1.0eV (for copper indium selenide) to about 1.7eV (for copper gallium selenide).

Capacity
The maximum amount of power a system or its component parts is expected to be capable of producing over a short time period.

Charge Controller
A component of a photovoltaic system that controls the flow of current to and from the battery subsystem to protect batteries from overcharge, overdischarge, or other control functions. The charge controller may also monitor system operational status.

Current (I)
The flow of charge through an electrical conductor, usually measured in Amperes (A). The relationship between power, current and voltage is expressed in the Power Equation, P=IV. The relationship between voltage, current, and resistance is expressed in Ohm's Law, V=IR. In fluid systems current is analogous to the flow rate (measured, for example, in gallons per minute).