I had an APC Smart-UPS. It started acting a bit funny (it's been a few years, so I can't quite remember what it was doing, that was "funny", but I vaguely recall something about lights and beeping). I wound up changing the battery, and the issue went away.

I couldn't find the manual online for your unit, so this is a wild guess.

in my bedroom and wakes me up. It also doesn't matter if my PC is on or off, it still does the same thing. It's really really weird.

Was solved w/ battery replacement. APC has a pretty good website. They also provide UPS management software that may help you diagnose the problem.

Maybe there is some sort of nightly self test that is scheduled. The software may help.

Good luck, if none of this works, just change your clocks so the UPS thinks it's noon while you are sleeping.....kidding.

self-test. The only thing I can think of it's something with the frequency of the incoming power usually around 1 AM.

Drove me nuts. I bought a replacement battery. Probkem solved.

It drove me crazy every night. I shut them down totally for 12 hours and the tests stated happening during the day. I couldn't find any info on turning that off.

They would also do this when the utility was going into a load management period. The utility lowers the line voltage at the start of that period. I confirmed this as I was in charge of that load management at he factory where I worked. My diesel generators were starting up at the same time. The late night beeps were not load management periods.

ETA: Mine are about 17 years old now

happening here. They have been doing a lot of work on the power distribution lines because of the growth of a city down the way. I just thought of this when I read your email.

They completed the work on the lines about a month ago, but they might be doing some load balancing of sorts in the night. When it happens, it always happens around 1AM which makes me believe it's possibly some type of utility action.

I've noticed even if I shut the UPS off for a period of time, the cycling still starts about 1AM. I know this because of all things, I have the computer setup in my bedroom and the UPS wakes me up like an alarm clock. LOL Fortunately, it does not always do it, but when it does, it's about 1AM.

minutes before the hour. It rarely came at any other time. Typically this would be for the hottest or coldest hour of the day and happen more in the early parts of the month and less after the months peak had been set. One a.m. doesn't seem to fit this.

residential area here, but maybe there is a heavy load on the lines around 1AM? Also, they have been doing major upgrades to the power lines. Maybe there is some night crew activity someplace around 1AM? No idea.

Last time it did some weird things an underground feeder line blew up and the crews came out and replaced the lines, but that time the UPS went randomly into backup for a few seconds at a time. I was going to replace the batteries, but there is absolutely nothing to indicate it has bad batteries. It passes self test OK and if unplugged it goes into backup and supports the system with no problem at all, and the battery indicator lights stay on/stable. I think what I'll do is wait and see if it clears, eventually.

I'll post back in awhile and let you know what's happening! Thanks for your posts, really appreciate it!

Hi, it stopped, just like that. A couple of days after we last talked it just stopped. It now never goes into that peculiar repetitive back up around 1AM. Also, all the lights in the area were off for about half an hour a few days ago. It must have been some type of testing they might have been doing on the power lines at night. There have been some major upgrades going on. Phew, I'm glad that's over with. Thanks for your relies and all!