UPS Suggestions
Joel Jaeggli
joelja at darkwing.uoregon.edu
Tue Aug 30 20:28:57 UTC 2005
On Tue, 30 Aug 2005, Mike McMullen wrote:
>
> ----- Original Message ----- From: "aaron hirsch" <aaronh at uptime.net>
>
>>> 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 at darkwing.uoregon.edu
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