A complete PV power system composed of the module (or arrary), and balance-of-system (BOS) components including the array supports, electrical conductors/wiring, fuses, safety disconnects, and grounds, charge controllers, inverters, battery storage, etc.

A heat source, such as a space heater, used to provide more heat than that provided by a primary heating source.

A water heater that releases hot water from the top of the tank when a hot water tap is opened. To replace that hot water, cold water enters the bottom of the tank to ensure a full tank.

A system where heat is supplied to areas of a building from a single appliance through a network of ducts or pipes.

A device used to regulate motor speed, or, in a wind energy conversion system, to control the rotational speed of the rotor.

A self-contained toilet that use the process of aerobic decomposition (composting) to break down feces into humus and odorless gases.

A light control device that allows light levels to be manually adjusted. A dimmer can save energy by reducing the amount of power delivered to the light while consuming very little themselves.

The measure of closeness in shape between a waveform and it's fundamental component.

The device that reduces the pressure of liquid refrigerant thereby cooling it before it enters the evaporator coil in a heat pump.

The water content of a substance (a solid fuel) as measured under specified conditions being the: Dry Basis, which equals the weight of the wet sample minus the weight of a (bone) dry sample divided by the weight of the dry sample times 100 (to get percen ...

A smaller version of standard fluorescent lamps which can directly replace standard incandescent lights. These lights consist of a gas filled tube, and a magnetic or electronic ballast.

The process of changing the structure of the electric power industry from one of guaranteed monopoly over service territories, as established by the Public Utility Holding Company Act of 1935, to one of open competition between power suppliers for custome ...

A system in which a working fluid is used over and over without introduction of new fluid, as in a hydronic heating system or mechanical refrigeration system.

All the natural and living things around us. The earth, air, weather, plants, and animals all make up our environment.

Materials that prevent or slow down the movement of heat.

A device that removes airborne particles from breathable air. Negative ions are produced and give up their negative charge to the particles. These new negative particles are then attracted to the positive particles surrounding them. This accumulation proc ...

Technologies that pertain to the generation of electricity.

The temperature that a system is designed to maintain (inside) or operate against (outside) under the most extreme conditions.

An electric generator consists of an armature and a field structure. The armature carries the wire loop, coil, or other windings in which the voltage is induced, whereas the field structure produces the magnetic field. In small generators, the armature is ...

A complete lighting unit consisting of a lamp(s), housing, and connection to the power circuit.