[mythtv-users] Uninterruptible Power Supply

John Drescher drescherjm at gmail.com
Tue Dec 22 06:42:39 UTC 2009

On Tue, Dec 22, 2009 at 1:36 AM, Raymond Wagner <raymond at wagnerrp.com> wrote:
> On 12/22/2009 1:23 AM, Tom Sparks wrote:
>> are UPS worth the cost?
>> How many hours should I am for?
>> should I connect my wireless router to the ups?
> What exactly do you think a UPS is for?  They are designed to run for
> several minutes during a moderate power outage, and then inform the machines
> to cleanly shut down before the battery goes critical.  Under full load on
> fresh batteries, you likely won't get much more than about 10 minutes out of
> one.

The key to long UPS runtime is never go above 1/4 of the recommended
power. And get a UPS with at minimum 2 9AH batteries.

>If you are looking for *hours* of operation running one or more Myth
> boxes and their attached TVs, you need to invest in a generator.

In the past I got over 1 hour of runtime with a 2.83GHz core2 quad
backend on a ~$100 PCM King Pro 1000VA UPS. I am talking of just the
backend running and nothing else connected to the UPS. I have since
upgraded to a APC 1400XL that has 2 18AH batteries and supposedly I am
supposed to break 2 hours with that. However I have not tested that
yet. The power has not been off for more than 30 minutes since I have
installed the new UPS...


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