Re: OT: UPS

I'm enjoying this discussion.  Is a high start-up current requirement an 
issue for home users?  I guess it may vary but I wouldn't start-up my PC 
during a power failure.  What used to kill me was the high start-up 
current for my old CRT monitor.  I would turn on the monitor to turn off 
the computer and then overload the UPS.  Now with the APC daemon, that is 
not an issue.


Dennis

On Thu, 27 Aug 2009, Raj wrote:

> Keep in mind that computers (or anything with a switching power supply for 
> that matter) also tend to have a very high start-up current requirement.  If 
> you cut the UPS specs too close to the running current, it may not be able to 
> provide the required start up current and may trip with an overload when you 
> start up the computer.
>
> --Raj.
>
> On 08/23/2009 09:19 PM, Charles MacDonald wrote:
>> James wrote:
>> 
>>> Do I need a UPS as powerful as kill a watt says?
>>> Or would a lesser UPS just not last as long powering my computer?
>>> 
>> 
>> There are two different concepts to keep in mind. The "kill-a-watt" will
>> tell you how many watts the unit needs at any instant. Your UPS MUST be
>> able to provide that much power (plus a bit to spare as the load may vary)
>> 
>> The UPS will also have an watt-Hour rating, say your system draws 200 w,
>> and the UPS is rated for 400Watt-hours So it could run the computer for
>> 2 hours. if it was good for 100 watt hours you would have a half hour to
>> get things shut down, BUT if the load capacity was less than the 200W
>> the system would draw, you would either blow a fuse in the UPS or let
>> out the famous "magic smoke" that Alan of Red Hat always used to blog
>> about.
>> 
>> (note that 200w at 115V is equivalent 1 3/4 AMPS, which is how your
>> fuses are rated, and how the UPS may be listed)
>> 
>> 
>
-- 
OCLUG general discussion list
[email protected]
http://oclug.on.ca/mailman/listinfo/oclug