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May I suggest that you include the type of UPS output. The some of cheaper off-line units display a distinctly non-sinusoidal waveform with large harmonic distortions. These cause localised heating in the computer's PSU.
Also if used with items such as CRTs you must take into account the large in-rush currents which can overload the UPS causing it to shut down.
Blue Skies
Pat Carpenter