Ga — See gallium.
GaAs — See gallium arsenide.
Gallium (Ga) — A chemical element, metallic in nature, used in making certain kinds of solar cells and
semiconductor devices.
Gallium Arsenide (GaAs) — A crystalline, high-efficiency compound used to make certain types of solar cells and
semiconductor material.
Gassing — The evolution of gas from one or more of the electrodes in the cells of a battery. Gassing commonly
results from local action self-discharge or from the electrolysis of water in the electrolyte during charging.
Gassing Current — The portion of charge current that goes into electrolytical production of hydrogen and
oxygen from the electrolytic liquid. This current increases with increasing voltage and temperature.
Gel-Type Battery — Lead-acid battery in which the electrolyte is composed of a silica gel matrix.
Gigawatt (GW) — A unit of power equal to 1 billion Watts; 1 million kilowatts, or 1,000 megawatts.
Grid — See electrical grid.
Grid-Connected System — A solar electric or photovoltaic (PV) system in which the PV array acts like a central
generating plant, supplying power to the grid.
Grid-Interactive System — Same as grid-connected system.
Grid Lines — Metallic contacts fused to the surface of the solar cell to provide a low resistance path for electrons
to flow out to the cell interconnect wires.
H
Harmonic Content — The number of frequencies in the output waveform in addition to the primary frequency (50
or 60 Hz.). Energy in these harmonic frequencies is lost and may cause excessive heating of the load.
Heterojunction — A region of electrical contact between two different materials.
High Voltage Disconnect — The voltage at which a charge controller will disconnect the photovoltaic array from
the batteries to prevent overcharging.
High Voltage Disconnect Hysteresis — The voltage difference between the high voltag disconnect set point and
the voltage at which the full photovoltaic array current will be reapplied.
Hole — The vacancy where an electron would normally exist in a solid; behaves like a positively charged particle.
Homojunction — The region between an n-layer and a p-layer in a single material, photovoltaic cell.
Hybrid System — A solar electric or photovoltaic system that includes other sources of electricity generation,
such as wind or diesel generators.
Hydrogenated Amorphous Silicon — Amorphous silicon with a small amount of incorporated hydrogen. The
hydrogen neutralizes dangling bonds in the amorphous silicon, allowing charge carriers to flow more freely.
GaAs — See gallium arsenide.
Gallium (Ga) — A chemical element, metallic in nature, used in making certain kinds of solar cells and
semiconductor devices.
Gallium Arsenide (GaAs) — A crystalline, high-efficiency compound used to make certain types of solar cells and
semiconductor material.
Gassing — The evolution of gas from one or more of the electrodes in the cells of a battery. Gassing commonly
results from local action self-discharge or from the electrolysis of water in the electrolyte during charging.
Gassing Current — The portion of charge current that goes into electrolytical production of hydrogen and
oxygen from the electrolytic liquid. This current increases with increasing voltage and temperature.
Gel-Type Battery — Lead-acid battery in which the electrolyte is composed of a silica gel matrix.
Gigawatt (GW) — A unit of power equal to 1 billion Watts; 1 million kilowatts, or 1,000 megawatts.
Grid — See electrical grid.
Grid-Connected System — A solar electric or photovoltaic (PV) system in which the PV array acts like a central
generating plant, supplying power to the grid.
Grid-Interactive System — Same as grid-connected system.
Grid Lines — Metallic contacts fused to the surface of the solar cell to provide a low resistance path for electrons
to flow out to the cell interconnect wires.
H
Harmonic Content — The number of frequencies in the output waveform in addition to the primary frequency (50
or 60 Hz.). Energy in these harmonic frequencies is lost and may cause excessive heating of the load.
Heterojunction — A region of electrical contact between two different materials.
High Voltage Disconnect — The voltage at which a charge controller will disconnect the photovoltaic array from
the batteries to prevent overcharging.
High Voltage Disconnect Hysteresis — The voltage difference between the high voltag disconnect set point and
the voltage at which the full photovoltaic array current will be reapplied.
Hole — The vacancy where an electron would normally exist in a solid; behaves like a positively charged particle.
Homojunction — The region between an n-layer and a p-layer in a single material, photovoltaic cell.
Hybrid System — A solar electric or photovoltaic system that includes other sources of electricity generation,
such as wind or diesel generators.
Hydrogenated Amorphous Silicon — Amorphous silicon with a small amount of incorporated hydrogen. The
hydrogen neutralizes dangling bonds in the amorphous silicon, allowing charge carriers to flow more freely.
GLOSSARY OF TERMS
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