Hi David,

there is one other option i see.

The types of UPS in the market can fall in two broad categories.
1. line interactive
2. online

i work with DELTA UPSes and they are the latter type. the difference?

online UPSes allow power to go through the UPS into the equipment whether or not the mains are working while line interactive kick in once power fails (blackout, brownout etc....)

line interactive UPSes therefore usually need a few seconds to minutes to kick in unlike the online UPSes which just switch supply to battery and continue working without effect. no dip in power, no flickering.

add to this the double conversion technology available in such system and you get filtered/Clean  power free of spikes and noise.......

i suggest, you look for an online double conversion ups of the same rating.

one last point, to get extended back up time does not necessarily require a bigger ups. if the UPSes you have serve your requirements then than is the right size of ups for you. what you need is to dimension a battery bank that can support longer back up.

that,s my take!

Date: Mon, 15 Nov 2010 09:30:41 +0300
From: daudi.were@gmail.com
To: skunkworks@lists.my.co.ke
Subject: Re: [Skunkworks] Power fluctuations and UPSes

Thanks guys
So if I understand correctly:
  1. a higher VA power will give me more time to back up etc if power fails completely
  2. my situation where the comps reboot each time the power fluctuates in probably because the UPS circuits are damaged and nothing to do with the VA power of  the UPS
  3. Therefore to deal with my situation I should be looking for a UPS with extra strong circuits rather than higher VA?
On 15 November 2010 09:02, Kenneth Ndirangu <kendirangu@gmail.com> wrote:
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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