OT: UPS for FreeBSD

[Mike Starr]

I haven't thought too much about this either, but how much does power
supply have to do with which os one uses?

Just a thought.

On Fri, Nov 28, 2014 at 2:04 PM, Paul Pathiakis via freebsd-questions <
freebsd-questions at freebsd.org> wrote:

> I guess I'm just that old. ;-)
>
> I used to see a lot of issues with the power coming in.  You could never
> tell if it was the initial power unless you got it at the junction of where
> it connected into the building.  About 50% of the time, it was horrible due
> to terrible, old infrastructure. (I'm in New England and some of it is
> STILL that way except I'll get an Electrical guy to run the power through
> an oscilloscope (so, yes, I still see them occasionally.) and prove to me
> it's clean coming in.)  After that, right after the main junction of where
> you will be drawing power for your UPS - mainly, I deal with floor mounted
> units. (The large building breaker(s)), is the next place to test. The
> worst place of the 'unclean' power I've ever seen was a renovated gun
> barrel machining factory.  Get this, the main junction breaker, was a piece
> of bimetallic chunk of metal 1500 kVA circuit designed to melt upon
> overload.  *shiver*)
>
> And, yes, switching UPS are a bane.  The early ones had a seriously loud
> audible 'click' upon switch over.
>
> I was educated by an Electrical Engineer (I'm CompSci) about 'simulated'
> sine wave. Good ones can even look like a real sine wave not square or
> stepped but they still are not.  However, 'truth in advertising' won't
> allow them to put 'double conversion sine wave' on it without it being
> true.  He told me that was the key and everyone tries every type of wording
> but will fall short of that phrase.  Words like 'simulated' 'sine wave'
> 'sine wave conversion' (this last one is the attempt to just have a single
> conversion, usually the second which is less expensive) etc are just
> marketing games.
>
> After this thread, I had to revisit locations to make sure I wasn't
> spouting crap or misinforming.  I started to have a doubt.
>
> I found this which seems to be pretty solid.  I believe it someone
> mentioned UltraUPS.
>
> http://www.controlledpwr.com/whitepapers/uutopla1.pdf
>
> "miles of power lines to your building" aren't the issues nowadays, the
> power switching supplies inside our buildings pollute the mains.
>
> Regards, Ralf
>
> PS: 99,999999999999% when I needed to repair broken gear in the last
> years, I needed to repair a f...ine switching power supply.
>
> Anyhow, everyone have a good day/night and weekend,
>
>
> P.
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