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
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