Hi Tim, On 21 October 2011 16:47, Tim <[email protected]> wrote:
> > I have and APC 3000 UPS <http://www.apc.com/resource/** > include/techspec_index.cfm?**base_sku=sua3000rmi2u<http://www.apc.com/resource/include/techspec_index.cfm?base_sku=sua3000rmi2u>>(see > link below) at work and it is causing a few problem. APC tech support want > me to run the UPS on battery on at least 30% load (but not using the current > server that are connected as the load for obvious reason). Now as this is a > 3000va UPS how many basic PC will I need to plug into the UPS to attain a > 30% load (I am assuming most PC have a 300w PSU?) > > http://www.apc.com/resource/**include/techspec_index.cfm?** > base_sku=sua3000rmi2u<http://www.apc.com/resource/include/techspec_index.cfm?base_sku=sua3000rmi2u> > > Any help would be appreciated > > Tim > The simple answer of 30 % of 3000 is 900 VA so 3 PC's is definitely wrong. This is because PC's nowadays generally have PSU's of anything from 250 W to 1000 W, AND because the load they draw from the mains is dependent on what they are doing. I suggest that a 1 KW electric fire would give a constant load of approximately the right size, and if the APC tech wants a more precise load then you need to look at other comparable electrically powered items. If APC want a REALLY precise load, then you also need to take into account Power Factor, which is a subject that needs considerably more space than a simple email, so I'd suggest 15 x 60 Watt incandescent light bulbs, or, (if you can find them), 9 x 100 W. You certainly can't use Compact Fluorescent bulbs though, it's that Power Factor thing. I hope this helps. -- Cheers Peter -- Next meeting: Bournemouth, Tuesday 2011-11-01 20:00 Meets, Mailing list, IRC, LinkedIn, ... http://dorset.lug.org.uk/ How to Report Bugs Effectively: http://goo.gl/4Xue
