Glossary: G

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Gassing

The production of hydrogen and oxygen gas from one or more of the electrodes in the cells of a battery. Gassing commonly results from the electrolysis of water in the electrolyte during charging.

Generator

A device that converts mechanical energy into electrical energy.

Geothermal Heat Pump

A type of heat pump that uses the ground, ground water, or ponds as a heat source and heat sink, rather than outside air. Compare to HEAT PUMP.

Gin Pole

Either of two different types of devices used with wind generator towers. With a tilt-up tower, it describes the lever that helps tilt the tower up. With a fixed tower, it describes a temporary crane used to raise tower sections or the wind generator.

Glycol (Propylene Glycol)

An antifreeze, heat transfer fluid that is circulated through closed loop solar hot water collectors.

GND

Ground: A conductor connected between a circuit and the soil.

Governing

Limiting the output of a device. In respect to small wind generators, governing normally happens through furling.

Governor

A device that limits the output of another device, such as a wind generator.

Graphic User Interface (GUI)

A computer system using graphics images on the screen rather than text to display applications information for the user.

Grid

Transmission line network used to distribute electrical energy, generally by a commercial power utility.

Grid Lines

Metallic contacts fused to the surface of a solar cell to provide a low resistance path for electrons to flow out to the cell interconnect wires.

Grid Tie System

A renewable energy system that is connected to the utility grid, selling excess energy back to the utility. Also called a utility-interactive system.

Grid-Tie System

A renewable energy system that is connected to the utility grid, selling excess energy back to the utility. Also called a utility-interactive system.

Ground

The connection of electrical components to the earth and/or each other for the purposes of dissipating static charge or protecting against a short circuit or lightning.

Ground (GND)

A conductor connected between a circuit and the soil.

Ground Fault

Unwanted current path to ground.

Ground Mount

A photovoltaic (PV) rack designed to be installed on the ground or other flat surface.

Ground Rod (Electrode)

A metal rod (typically 5/8 inch diameter) that is driven into the earth (typically 8 feet deep) and is electrically connected to the negative conductor and/or any metal parts, wiring enclosures, or conduit of an electrical circuit.

Guy Wires

Steel cables that support a tower.