“Is the battery backup supposed to make a humming noise even when shut off?”

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• Thank you for your inquiry. The UPS may make a small humming noise especially when the unit is on battery. It shouldn't be noticeable in an office environment though. Please reach out at to an APCbySchneider support team at your convenience so we can look into this issue further. We offer email and chat services through our support site and you may also contact us directly at 800-800-4272 option 4.

  Answered by APCProductSupport 7 years ago

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• IT HUMS...BECAUSE IT DOESN'T KNOW THE WORDS...AND NO, IT'S N O T NORMAL.

  Answered by JCJC1123 7 years ago

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