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#39698
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Detonator
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avben1 –

Over a span of 8 years using 3 different cheap APC units (500, 550va), I have had no issues, they have always regularly passed the UPS “test” (pull the plug on the UPS with the system running) and have been dead quiet. I opine you had a bad UPS, and suggesting from a single experience these units all produce a buzz is unwarranted. Certainly any unit bought new that is defective should be returned, any unit bought used can be risky.

-Tim T