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Anyone with APC smt lcd 1000 (or 1500)? is this noise normal?

APC UPS for Home and Office Forum

Schneider Electric support forum for our APC offers including Home Office UPS, Surge Protectors, UTS, software and services and associated products designed to share knowledge, installation, and configuration.


Anyone with APC smt lcd 1000 (or 1500)? is this noise normal?

This was originally posted on APC forums on 5/22/2012

I have bought a STM1000l,
When the batteries are at 100%, this noise start and it's go ahead every 20 seconds (you can hear it at the start of this audio file and 2 times after around 20 and 40 seconds).
It is possible to hear it also when the smart UPS is off, but with the current attached.
Is there anyone with this model? is there this noise?

The seller has sent another ups, but there is the same noise..