From owner-freebsd-questions@FreeBSD.ORG Fri Nov 28 23:15:25 2014 Return-Path: Delivered-To: freebsd-questions@freebsd.org Received: from mx1.freebsd.org (mx1.freebsd.org [IPv6:2001:1900:2254:206a::19:1]) (using TLSv1.2 with cipher AECDH-AES256-SHA (256/256 bits)) (No client certificate requested) by hub.freebsd.org (Postfix) with ESMTPS id BAA0F849 for ; Fri, 28 Nov 2014 23:15:25 +0000 (UTC) Received: from mail-vc0-x233.google.com (mail-vc0-x233.google.com [IPv6:2607:f8b0:400c:c03::233]) (using TLSv1 with cipher ECDHE-RSA-RC4-SHA (128/128 bits)) (Client CN "smtp.gmail.com", Issuer "Google Internet Authority G2" (verified OK)) by mx1.freebsd.org (Postfix) with ESMTPS id 6B9249E for ; Fri, 28 Nov 2014 23:15:25 +0000 (UTC) Received: by mail-vc0-f179.google.com with SMTP id le20so3237985vcb.24 for ; Fri, 28 Nov 2014 15:15:24 -0800 (PST) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=gmail.com; s=20120113; h=mime-version:in-reply-to:references:date:message-id:subject:from:to :cc:content-type; bh=wNmejxTyI4gI528r5KF4vMrWBQQLPK4gnppRgIWYlkA=; b=sDbCYHgimuP7CL5r4WFRXOczyvzrIOQ3mza8JBPn7xDSZEceJLg7YzYH7zV1NVwUPK 7OD2xGv7p3ZB9e5pRPqRWxtDms3FrwxSM+lrQAvNGim46O5UKPeZm0+GPp2dKJbvXp3G JIKy/SxsrVNAMGmLbS1uhvtxc5fM7goUZ8cSzOpNhtfe6iVtu5mHqXfScrT8omqGyKPI y8k8rh1pqqwlHk5jDJCOdxawlMp2tKD7qZM0enoqMHfeu4gwC6d2BMA5S+J8VeA9uP6U fbtZxAGxu+WO88J1MoQ8OdhJa+42vsWpI7RhJpwF3fwyWYT0ki5mIthEzKywdUgemxaK 7V+w== MIME-Version: 1.0 X-Received: by 10.52.7.98 with SMTP id i2mr20049797vda.18.1417216524468; Fri, 28 Nov 2014 15:15:24 -0800 (PST) Received: by 10.31.137.17 with HTTP; Fri, 28 Nov 2014 15:15:24 -0800 (PST) In-Reply-To: <5478F16A.80605@yahoo.com> References: <54777AB1.9010800@bluerosetech.com> <54779629.302@bluerosetech.com> <5478BD4F.7020306@yahoo.com> <5478BEE6.30308@bluerosetech.com> <5478CC08.9090307@yahoo.com> <20141128204722.561f948e@archlinux> <5478F16A.80605@yahoo.com> Date: Fri, 28 Nov 2014 15:15:24 -0800 Message-ID: Subject: Re: OT: UPS for FreeBSD From: Mike Starr To: Paul Pathiakis Content-Type: text/plain; charset=UTF-8 X-Content-Filtered-By: Mailman/MimeDel 2.1.18-1 Cc: freebsd-questions@freebsd.org X-BeenThere: freebsd-questions@freebsd.org X-Mailman-Version: 2.1.18-1 Precedence: list List-Id: User questions List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , X-List-Received-Date: Fri, 28 Nov 2014 23:15:25 -0000 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" >