Arthur Britto wrote:
> On Sun, 2008-05-11 at 10:15 -0700, maxim wexler wrote:
>  
>> I did a search for UPS units and was overwhelmed by the diversity out there.
>>
>> What can the group recommend?
>>
>> I only need something that will give me about a minute's head start to safely turn of the box.
>>  
>
> You likely want more than a minute.  Most likely, you don't want your
> system to crash when coming back up when power fails soon after it is
> restored: your system could be in the middle of a fsck. Generally, you
> want enough capacity to: power off, power on, and then power off safely.
>  
True, but I find the main purpose of my UPS is to keep the computer
running throughout a short power-outage. That's what happens 90% of the
time, the other 10% of the time, the power outage lasts longer than the
UPS and it shuts the computer down.
> I am very happy with the CyberPower Intelligent LCD Series: CP*AVRLCD
> http://www.cyberpowersystems.com/
>
> The series has:
>
> NUT support:
> You want something that works with NUT. Instead of a vendor specific
> package. This way your acquired skills are portable and future proofed.
>  Network UPS Tools
>  http://eu1.networkupstools.org
> NUT is great. It safely powers off my system when the UPS is low.
> Additionally, I set it up to e-mail my cell phone when the power state
> changes. If I go out during a power outage, I can stay out longer if I
> know the power is not restored.
>  
Didn't know that existed. It has really good UPS support too. Guess I
can buy something other than an APC.
> USB interface:
> * A USB port is more future proof: serial ports are becoming rare.
> * Allows monitoring UPS state.
> * Allows powering off the UPS.
>
> LCD Display:
> At a touch know:
> * power consumption (don't need to pull out a Kill-O-Watt)
> * battery charge
> * estimated minutes remaining
>  
How much do you think this draws? Does it have any negative effect on
backup time?
> One thing to be wary of is like most inexpensive UPSes it does not
> provide a pure sine wave. This can damage a power supply that has
> active power factor correction. Luckily for my Silencer 750 Quad
> according to the manufacturer due to the short time in which the UPS is
> in use it is not an issue.
>  
Could this be why my computer makes this horrific buzzing noise when on
the UPS?

I have an APC XS800, the PSU is a Seasonic 330W with Active PFC.
> -Arthur
>
>  
-Hal
--
gentoo-user@(protected)