Return-Path: Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1751497AbWEUWkW (ORCPT ); Sun, 21 May 2006 18:40:22 -0400 Received: (majordomo@vger.kernel.org) by vger.kernel.org id S1751542AbWEUWkW (ORCPT ); Sun, 21 May 2006 18:40:22 -0400 Received: from mail.gmx.net ([213.165.64.20]:54227 "HELO mail.gmx.net") by vger.kernel.org with SMTP id S1751497AbWEUWkW (ORCPT ); Sun, 21 May 2006 18:40:22 -0400 X-Authenticated: #2308221 Date: Mon, 22 May 2006 00:40:12 +0200 From: Christian Trefzer To: Pau Garcia i Quiles Cc: linux-kernel@vger.kernel.org Subject: Re: [IDEA] Poor man's UPS Message-ID: <20060521224012.GB30855@hermes.uziel.local> References: <200605212131.47860.pgquiles@elpauer.org> Mime-Version: 1.0 Content-Type: multipart/signed; micalg=pgp-sha1; protocol="application/pgp-signature"; boundary="mJm6k4Vb/yFcL9ZU" Content-Disposition: inline In-Reply-To: <200605212131.47860.pgquiles@elpauer.org> User-Agent: Mutt/1.5.11 X-Y-GMX-Trusted: 0 Sender: linux-kernel-owner@vger.kernel.org X-Mailing-List: linux-kernel@vger.kernel.org Content-Length: 2732 Lines: 67 --mJm6k4Vb/yFcL9ZU Content-Type: text/plain; charset=iso-8859-1 Content-Disposition: inline Content-Transfer-Encoding: quoted-printable Hi there, On Sun, May 21, 2006 at 09:31:30PM +0200, Pau Garcia i Quiles wrote: > [interesting idea with complex implementational problems] I think it would be cheaper ("costs" for your solutin in terms of required I/O power and hard disk space) to use two or more lead batteries which are charged and discharged in a round-robin fashion, controlled by some smart home-brew circuitry, and connect the beast to some control/monitoring software via RS-232 ; ) The logic should at least completely drain the battery before recharging, and maybe even do a quick-and-hot charge-discharge-charge cycle every now and then to reduce chemical byproducts at the cathode - or was it the anode? Well, one of them is dissolved over time, and the other one collects some sulfate or sulfide or something. If you want it really complicated and robust, you might want to monitor the electric parameters of the batteries at all times, to estimate the minimum remaining time once the power is cut. You'd then have to shut down, or better hibernate, the system cleanly within that time frame to be safe =66rom data loss. I'd love to do something like that sort of in-between the PSU for a single machine, for this would avoid the need to go from AC to DC and back, but lacking the electrotechnical skills I'm not self-confident enough to try and waste my PSU. Anyway, this has gone way off-topic by now. Kind regards, Chris --mJm6k4Vb/yFcL9ZU Content-Type: application/pgp-signature Content-Disposition: inline -----BEGIN PGP SIGNATURE----- Version: GnuPG v1.4.2.2 (GNU/Linux) iQIVAwUBRHDsS12m8MprmeOlAQK96Q//UYfr/UnLrwsGhurTLhkAh/Hn6gKOU0RO NOKeOGjBJQELq84wqeCjhUMC8Tg6JsysffLTsjPUQdCgISAP9WSRkw43N8oXXEcN qpQXBCkWRbT8f6CXbafO8DT277sEoOaRsFK2JvVaVXfUEwWmmUPVpUJaFBm/O7OR rr49zjcjTDe8H2bKTRNNEFCxaCyhvk3/G/JYDApyls55Gkw9lnVIuwGSkSwMehc0 Fek3lzq/FsZOhvB0s5dPB2m314acc1WxVIj0kkZYc9LzNPSdVF0mi04TVNyPZs5N uXdJKLhgdIBSVNZgrJ/Ha44EZ6EcosJq33jMBOvGMjvKHjY2w+XFGN+5/6BHswfy j5N7sE8KHXwLQWjreD+3lAIrXffB4ZttkF4jdeYM/A19x2o4VPC2eKtGpH5n8UJ+ xJ9pRxMlZiIiQzpBRhw5mGkM0hbnHltNM8e5/fssRJQB3Ne2M0OzG11F2/oz+D5i EMZXmZOvRI+1qdOnvRZM/tQkTZX16BhZMSt1KJ4+SFF1GPlN96cRK5akl27Y5d7c TTrGPJewOgRcVKN2QwKqt6WZwwolWcAhtMV8hzpSwNcZLOXoXktidC7Bdba7hT4N /H6zhm7cngo8SF6GSoERA44qWhZ3IZaQzeeJJacc0KCu/SAd88W+218Tx/XuGy/P HaJ+Qq6IElg= =/m2O -----END PGP SIGNATURE----- --mJm6k4Vb/yFcL9ZU-- - To unsubscribe from this list: send the line "unsubscribe linux-kernel" in the body of a message to majordomo@vger.kernel.org More majordomo info at http://vger.kernel.org/majordomo-info.html Please read the FAQ at http://www.tux.org/lkml/