David,

You probably need to clarify how the office is wired.
Seems to me like each ups is sitting on a different power source (different phase and different breakers).
It's common with kplc in cases of 3 phase supplies to have a brown/blackout on one phase only.

some ups have high voltage sensitivity and transfer capabilities that makes them capapble of working with a varying input voltage including brownouts.

When selecting a ups, count your pc's determine how much runtime u want then go for it. In the long run it's easier t handle 1 big ups instead of many small ones. but a 650va ups on a desktop pc is just enough time to finish up and shutdown safely.

hth
Ken

On 15 November 2010 08:05, Job Muriuki <muriukin@gmail.com> wrote:

There is a difference in the two UPSs. The higher the rating in VA the more power can be provided

to yo PC so it lasts longer. Just multiply that value with the power factor of your UPS for APC its

about 0.6 to get power in watts. For the reboots its the circuits in the UPS that are giving in.

Where are you located? I noticed some of my routers in upperhill are rebooting especially yesterday.

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