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.