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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.

This entry is located in the following unit: Photovoltaic Conversion Efficiency Terms + (page 10)
total harmonic distortion
The measure of closeness in shape between a waveform and it's fundamental component.
This entry is located in the following unit: Photovoltaic Conversion Efficiency Terms + (page 22)