On Tue, 30 Aug 2005, Mike McMullen wrote:
----- Original Message ----- From: "aaron hirsch" <aaronh@xxxxxxxxxx>
I'm looking to buy a UPS with greater than 90 minute battery life
for 3 servers I have. The servers are Athlon XP 2900+ with 2 EIDE
drives in each. Nothing else in the boxes.
I'm not looking for exact numbers etc, just feedback on experiences
with >90 minute UPS. What brands work well for you.
[aaron hirsch]
To provide you with more info we really need to know what the power
supply is rated at. i.e. 400w, 700w, etc...
Regardless I'd look at the APC products.
Duh... that would help wouldn't it? ;-)
Well sort of, first off switching power supplies don't typically draw as
much as their maximum fused load under normal circumstances. second their
conversion efficiency increases as the load does, typically from around
60% to 90%
The only real way to measure the power consumption of a pc is at that the
wall. you want to measure it at power on, idle and at peak load.
90 minutes for a 400-500 watt load, which might be 3 typical pc's or one
very powerful dual processor machine is going to be a fairly large ups...
in an apc product the smart ups 2200 is probably about the right size... a
runtime calculator is here:
http://www.apcc.com/products/runtime_for_extendedruntime.cfm?upsfamily=165
400-500 watt power supplies.
Thanks,
Mike
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Joel Jaeggli Unix Consulting joelja@xxxxxxxxxxxxxxxxxxxx
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