How to tell when UPS is no longer protecting

I have a APC SUA1500RM in server 11 years. Nothing seems to be wrong except for replacing the battery. How do I know if the UPS still is protecting my servers?
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I'm not so sure about that.  I know there are some that will let you know if their MOV's are burned out but I can't find that about the SUA1500RM - might be because of it's age.

Sorry I can't help more...maybe a call to APC is warranted for a sure answer.
I'm not trying to be funny, but the easiest way is to unplug the UPS and see what happens.

The only other thing you could do would be to remove the UPS from powering your servers, plug something else into it, then unplug the UPS.

If you have monitoring software set up that should be able to tell you the health of the UPS...and if that looks good, unplug it.

I do this with mine every now and then, and the worst result is a power loss to the server - so you might want to do it off-hours when no one will be needing it if you have to restart.
katredrumAuthor Commented:
Thanks for the reply. I was wondering if there was a way to know other then trial and error. I've read about MOV and how each surge can degrade it, in my case, I'm wondering if the UPS still can protect against surges and not necessarily power loss.
you can always power the server off, and connect some lamps to the sockets for testing,  - then remove the AC line from it, and time how long it can power the load - with the given load in Watts
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