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APC Back-UPS Pro 1500S Producing a Coil Whine-Like Squeal Without Load | Back-UPS & Surge Protectors

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APC Back-UPS Pro 1500S Producing a Coil Whine-Like Squeal Without Load

Discussion in Back-UPS & Surge Protectors started by Maalik , 1/11/2021 1:54 PM
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APC Back-UPS Pro 1500S Producing a Coil Whine-Like Squeal Without Load

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  • I have just purchased an APC Back-UPS Pro 1500S uninterruptable power supply from Amazon the other day, and I've found a peculiar issue with it.
    Despite letting it to charge for almost a day, it produces a faint squeal still audible from about a meter away. This sound modulates between a lower and a higher pitch in a regular pattern.
    This occurs even when the UPS has no load placed on it, and while it is plugged into a presumably good outlet.
    • Is this an example of coil whine?
    • Is this normal for this model of UPS, or is this unit defective?
    • Is there a way to mitigate the sound without the need of hardware mods?
    • Do all UPS's of this power level produce this sort of sound, or are there any pure sine wave 900w+ UPS's on the market that can operate silently?
    Many thanks in advance for any advice y'all can give?
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