From owner-freebsd-questions@FreeBSD.ORG Tue Nov 28 13:35:26 2006 Return-Path: X-Original-To: questions@freebsd.org Delivered-To: freebsd-questions@FreeBSD.ORG Received: from mx1.FreeBSD.org (mx1.freebsd.org [69.147.83.52]) by hub.freebsd.org (Postfix) with ESMTP id 25B6A16A40F for ; Tue, 28 Nov 2006 13:35:26 +0000 (UTC) (envelope-from nathan@vidican.com) Received: from wmptl.net (mail.wmptl.com [216.8.159.133]) by mx1.FreeBSD.org (Postfix) with ESMTP id 9D61543CD5 for ; Tue, 28 Nov 2006 13:33:26 +0000 (GMT) (envelope-from nathan@vidican.com) Received: from [10.0.0.104] (r3140ca.wmptl.net [10.0.0.104]) by wmptl.net (8.13.4/8.13.4) with ESMTP id kASDXNvr085755; Tue, 28 Nov 2006 08:33:23 -0500 (EST) (envelope-from nathan@vidican.com) Message-ID: <456C3AA2.6040402@vidican.com> Date: Tue, 28 Nov 2006 08:33:22 -0500 From: Nathan Vidican User-Agent: Thunderbird 1.5.0.7 (X11/20061027) MIME-Version: 1.0 To: a@zeos.net References: <20061128074440.GA670@localhost> In-Reply-To: <20061128074440.GA670@localhost> Content-Type: text/plain; charset=utf-8; format=flowed Content-Transfer-Encoding: 7bit X-Scanned-By: MIMEDefang 2.54 on 10.0.0.80 Cc: questions@freebsd.org Subject: Re: How to choose an UPS? X-BeenThere: freebsd-questions@freebsd.org X-Mailman-Version: 2.1.5 Precedence: list List-Id: User questions List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , X-List-Received-Date: Tue, 28 Nov 2006 13:35:26 -0000 a@zeos.net wrote: > I am going to buy an UPS. > What should I know and take into account to choose a proper one? > > Elisej Babenko > _______________________________________________ > 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" > > > Aside from the obvious (that it matches the power type you use; ie North American vs european, aka 50 vs 60 cycles)... You should look to the overall capacity, (to make sure it can operate your hardware), and then the runtime... for example, you probably want something larger than 500va on a dual-cpu server loaded with goodies... however a 500va unit is just fine for the average desktop system. My advice, would be to calculate the maximum draw for everything you want on the UPS combined, (ie: 450watt desktop pc, 250watt monitor = 700watts total), and then find a UPS with a suitable runtime for that wattage, ie: decent 1000va should give about 20mins for a 700watt load. Bear in mind, that's at maximum draw and maximum charge on the UPS' battery... so your runtime will vary and almost never maxes at what the box it came in may say ;) Be liberal about it is all, and remember to leave monitor (if any) off when you're not around. Unless of course you're talking about larger (datacenter-oriented) UPS'... in which case, if you're asking this generally - it'd be my advice to you to seek out an electrician. -- Nathan Vidican nvidican@wmptl.com