From owner-freebsd-questions@FreeBSD.ORG Sat Nov 29 04:05:50 2014 Return-Path: Delivered-To: freebsd-questions@freebsd.org Received: from mx1.freebsd.org (mx1.freebsd.org [8.8.178.115]) (using TLSv1.2 with cipher AECDH-AES256-SHA (256/256 bits)) (No client certificate requested) by hub.freebsd.org (Postfix) with ESMTPS id EF6E3AFB for ; Sat, 29 Nov 2014 04:05:50 +0000 (UTC) Received: from nm36.bullet.mail.ir2.yahoo.com (nm36.bullet.mail.ir2.yahoo.com [212.82.96.61]) (using TLSv1 with cipher ECDHE-RSA-RC4-SHA (128/128 bits)) (Client did not present a certificate) by mx1.freebsd.org (Postfix) with ESMTPS id 3E1F2EB5 for ; Sat, 29 Nov 2014 04:05:49 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=rocketmail.com; s=s1024; t=1417233846; bh=a5cnJi7lAyXn3R+TPiiiSS/YxdMo8+muOVBOuj0F9sU=; h=Date:From:To:Subject:In-Reply-To:References:From:Subject; b=nCblO9g0nEaevv1OInDuQhx8uZCoabb3XlxVi8o6YX7Hga8cCm0GZ/3VIIxwPKiorGWL0XYPXk+4WyFGee6QgABo0b7RMq1SBnUhc5BEkekh78abffZTE4uXwkXPVZa/Pg1SWPJzGc2yHx0olnrKvuNMxZBo3Kz97JNakldgkOs= DomainKey-Signature: a=rsa-sha1; q=dns; c=nofws; s=s1024; d=rocketmail.com; b=bSdIYq+8hSBG8HrLw1cvSttCR3pFGDtawm8iurr3giuFOLJ4+ieFUXygcvfx1IedIAb3ISFNISCyJCrVYfhZHujnUbioC+xo9aDR/YxIRovTPn0fjmydzW7iZ1VUJfLvc/BOtjZY1OEBu4x5d3dBYbOWCBuhH22JfwqeaMINaAw=; Received: from [212.82.98.59] by nm36.bullet.mail.ir2.yahoo.com with NNFMP; 29 Nov 2014 04:04:06 -0000 Received: from [46.228.39.90] by tm12.bullet.mail.ir2.yahoo.com with NNFMP; 29 Nov 2014 04:04:06 -0000 Received: from [127.0.0.1] by smtp127.mail.ir2.yahoo.com with NNFMP; 29 Nov 2014 04:04:06 -0000 X-Yahoo-Newman-Id: 607175.35987.bm@smtp127.mail.ir2.yahoo.com X-Yahoo-Newman-Property: ymail-3 X-YMail-OSG: n5j9r7IVM1nGtPGNwxdJKlgGVu63tz2QnFKTTQg.Dw7Uj43 RF_3XHsyAmgIwTKnkpLYyR8ZJyZWm69D0Obd70TnXAyNqshH.xV6GEqHxvY6 9y4KF_i.rKl4H8MXL90_NQ2emSV1nZbwk2jyZoYmskyzrURvzBqzGRau2gon YKJ5toqm_0ZbOVsLSTuPVQql8i54JnhYqPwUu5GvmemBpLQTiLsU9EZYxFqk 1sLo3NH_2FeWhW.pMVPI6mBiFIaf4YAJmF62iiaFH2gcGwDx.gYtQ7jbwIe5 xCfkaPTcb0hAMRXjzj6uCRQvcKG83XgoWRo2dPOzpXoVuoaOU.WJMrtqh_4W y0Lcxdc4ghhn2eUjo_WayfbF9p9cIDEZDS.QRHJd9zhKKyH2qXrsunlaZ81h nlfWehwvS5p0sWHZKH3ZiqiFB8tAdxZ7RKOvgHv.Eo42bj9q4nsIcFV6KJ5l bPqyV_kGrQhGjrKxJVeHoDPmTDMc5mqYvH.6nR0WeJtq0_reGxpxpTqsbD8s 18WKpLQJELzGS4UItCrPIqVr6S4IdxhK_7XXA.Uad8mpLzyy8atZ7gXrRWuW I0P7fhgU- X-Yahoo-SMTP: BeMCPs2swBABTJ3kAeEiC_hE0mz8jRexLddJfD8pI2j32fOacjBmXg-- Date: Sat, 29 Nov 2014 05:04:05 +0100 From: Ralf Mardorf To: freebsd-questions@freebsd.org Subject: Re: [Bulk] Re: OT: UPS for FreeBSD Message-ID: <20141129050405.0a17ca3a@archlinux> In-Reply-To: <20141129113405.3d1bd1d6@X220.alogt.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> <54791d3a.w/pI0kak03d+3nKC%perryh@pluto.rain.com> <20141129113405.3d1bd1d6@X220.alogt.com> X-Mailer: Claws Mail 3.11.1-34-g5c904ff (GTK+ 2.24.25; x86_64-arch-linux-gnu) MIME-Version: 1.0 Content-Type: text/plain; charset=US-ASCII Content-Transfer-Encoding: 7bit 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: Sat, 29 Nov 2014 04:05:51 -0000 On Sat, 29 Nov 2014 11:34:05 +0800 Erich Dollansky wrote: > On Fri, 28 Nov 2014 17:26:03 -0800 > Michael Sierchio wrote: > > > I've always found it amazingly absurd that you use a UPS (a bank of > > batteries charged by AC->DC conversion), invert it back to AC, which > > gets converted to DC for the motherboard and peripherals. > > a long time, this was not the case. It was the time when linear power > supplies were the standard. A batterie was supplying electricity via a > diode to the DC input of the voltage regulator. > > As switching voltage regulators use a few hundred volts, it is a bit > difficult to match this with a battery. Instead of getting an UPS to feed the PSU, it would be smarter to replace the computer's PSU with a combination of UPS and PSU. There's no good reason for a double conversion.