Power Quality – Total Harmonic Distortion

All generators are relatively unclean power when compared to utility generated power. The level of ‘uncleanliness’ is called Total Harmonic Distortion” (THD). A generator of 6% THD or lower is considered a high quality generator. If you are intending on powering computers and expensive stereo equipment, then investing in a cleaner generator with lower THD will possibly prevent damage to the equipment. It seems that if a generator is cheaper than others for the same power level that they do not advertise the THD of the motor. So it is probably true that a dirtier motor will not state the THD and will cost your less, but if it causes electronics to be damaged it may cost you more in the long run.