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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