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Halogen lamp |
A special type of incandescent globe made of quartz glass and a tungsten filament, enabling it to run at a much higher temperature than a conventional incandescent globe. Efficiency is better than a normal incandescent, but not as good as a fluorescent light. |
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Harmonic content |
Frequencies in the output waveform in addition to the primary frequency (usually 50 or 60 Hz.) Energy in these harmonics is lost and can cause undue heating of the load. |
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HE |
High efficiency. |
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Head |
The vertical distance that water will fall from the inlet of the collection pipe to the water turbine in a hydro power system. |
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Hertz (Hz) |
Unit of measurement for frequency. Home mains power is normally 50Hz in Europe and 60Hz in the USA. The magnitude of the current is measured in Amps. |
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HF |
High-reflector. |
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High voltage disconnect |
Voltage at which the charge controller will disconnect the array to prevent overcharging the batteries. |
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Hot spot |
A phenomenon where one or more cells within a PV module or array act as a resistive load, resulting in local overheating or melting of the cells. |
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Hybrid system |
A PV system that includes solar PV and some other electricity generating power source. |
