On 22/10/11 09:25, Peter Washington wrote:
Hi Tim,
On 21 October 2011 16:47, Tim<xendis...@gmx.com> 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.
Thanks Peter
After posting this last night I thought about a 1kw heater in
conjunction with a meter that will measure the va for me. I am going to
get one of these
http://www.maplin.co.uk/plug-in-mains-power-and-energy-monitor-38343
APC tech support say the load should be +\-5% so I think should be able
to give it a go with those bits.
Tim
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