Date: Fri, 28 Nov 2014 15:15:24 -0800 From: Mike Starr <starrtennis@gmail.com> To: Paul Pathiakis <pathiaki2@yahoo.com> Cc: freebsd-questions@freebsd.org Subject: Re: OT: UPS for FreeBSD Message-ID: <CABhTyc9m7fOoeV170dj=foAhmyYWphzc8KD8wBacu5gNRPhT%2BQ@mail.gmail.com> In-Reply-To: <5478F16A.80605@yahoo.com> References: <CAHieY7QGp2ELF-R91eu=vSrPsimVmVNJQ4kfucQ56PR7EEZmig@mail.gmail.com> <m57qdq$did$1@ger.gmane.org> <54777AB1.9010800@bluerosetech.com> <m581p1$65m$1@ger.gmane.org> <54779629.302@bluerosetech.com> <alpine.BSF.2.11.1411271433320.60866@wonkity.com> <5478BD4F.7020306@yahoo.com> <5478BEE6.30308@bluerosetech.com> <5478CC08.9090307@yahoo.com> <20141128204722.561f948e@archlinux> <5478F16A.80605@yahoo.com>
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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@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. > _______________________________________________ > freebsd-questions@freebsd.org mailing list > http://lists.freebsd.org/mailman/listinfo/freebsd-questions > To unsubscribe, send any mail to "freebsd-questions- > unsubscribe@freebsd.org" >
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