If you don't have power issues, you will never hear it, but when it kicks into battery backup mode, the fan will run the entire time and then for a while after while it recharges

I've had lots of UPS, and when there's no power issues, they're like bricks, just out of the way

we appeared to have no power issues with our critical gear.

I do not believe that there were actually any mains power issues as none of the four other UPS's kicked over to battery (I receive five emails, one from each system when there is a legitimate power issue).Yesterday, after less than a month of use, my friends unit has now started to experience the same issue.

I have had 2 power issues since purchase without failure.

That's plenty of time for the system to shut itself down (which happens at 30 minutes of outage), or just ride through dirty power issues which we have

We live in a tropical climate with constant power surges, power outages, and all other matters of power issues due to the bad summer weather

You can track long term power issues and usage by using the software.

Again, no power issues (storms, outages, etc).

Never worry about power surges, brown-outs, or other typical power issues again.

I wish the PowerChute software allowed me to have more control over the voltage levels and a few other little things, but it gives me access to everything essential that I need to run and report on the unit and power issues, so I am happy with it and plan to continue to use it as my primary back-up UPS for years

It keeps me informed of any power issues.

Not as bad as I first thought

Other companies are certainly improving, but when it's critical I always go with APC.

Power outage at the house (Storm), lost connectivity (router, etc.)...the "U" in UPS is false with this thing