Re: Re: HP Power Trust UPS Info?

[Dave McLaughlin <dave@xxxxxxxxxxxxxxxxxxxxxxx>]

Thanks for that Andy. Useful info indeed.

I only bought this one as I needed something to backup a 12V 5A power
supply that is used to power my control network so I therefor didn't
need anything fancy or expensive.

I did try it on the PC and as you say, the runtime was way less than
they quoted. I only got about 5 mins at most and that didn't even
include the monitor plugged in either. Very poor.

I use multi-battery units on my PC equipment and use something that
gives me at least 30 mins of run time. Have only ever had a major outage
once in the 3 years I have been here and that was about 4 hours long.
Most have been about 5-10 mins on average.

Regards
Dave...

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Very funny Scotty, now beam down my clothes...!!
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http://www.embeddedcomputer.co.uk
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Andy Whitfield wrote:

> Some small UPSs are cheap because....
> 1) They cut back on batteries.  Eg. use a single 12v5Ah instead of
> two 12v7Ah (a third of the runtime!).
> 2) When running on batteries they output a crude square wave instead
> of a sine wave.  Square wave output can cause interference on some
> equipment.
> 3) Minimal front panel info.  Eg. One on/off button and one LED.
>
> And lastly they are greatly misleading on battery runtime by not
> stating the load.  You'd never achieve anything like their stated
> runtimes if using a standard PC + monitor.
> Regards
> Andy
>