> -----Original Message----- > From: centos-bounces at centos.org > [mailto:centos-bounces at centos.org] On Behalf Of Marko Vojinovic > Sent: Saturday, July 02, 2011 13:10 > To: CentOS mailing list > Subject: Re: [CentOS] Power-outage > > On Saturday 02 July 2011 15:45:11 Robert Heller wrote: > > At Sat, 02 Jul 2011 14:52:27 +0200 CentOS mailing list > > <centos at centos.org> > wrote: > > > Emmanuel Noobadmin wrote: > > > >> It seems to me that it should be possible to have a simple, > > > >> torch-battery operated, system which will keep the > machine alive > > > >> long enough to make a graceful exit. > > > > > > > > The problem > > > > with your idea is that you'll need a DC to AC inverter that can > > > > handle the output current required by your server and > something to > > > > hold the batteries (you'll need more than one because > attempting > > > > to draw a huge current from a normal battery will > either kill it > > > > or at the very least cause it to have a shorter than expected > > > > capacity) and everything together, it's probably going to cost > > > > more in both money and time to have this thing. > > > > > > I'm sure you are right, as I know nothing at all about > power supplies. > > > But surely computers actually use DC, so couldn't my > torch-battery > > > device just supply the PC components directly? > > > > A PC uses several *different* DC voltages: +12, +5, +3.3, > and several > > others and they need to be *precise*. Some of these are > not an exact > > multiples of the standard 1.5V Carbon-Zinc cells typicaly used in > > torch batteries. > > I wonder, how is this issue solved in laptops? They use only > one DC battery, typically with a single voltage output, AFAIK. > (sorry ctrl-enter sends...) Laptops, google mother boards, etc have power supply circuits on board. Remember that a switching powersupply taking AC still has dc to dc converters in it after the conditioning stage. -- -=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=- - - - Jason Pyeron PD Inc. http://www.pdinc.us - - Principal Consultant 10 West 24th Street #100 - - +1 (443) 269-1555 x333 Baltimore, Maryland 21218 - - - -=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=- This message is copyright PD Inc, subject to license 20080407P00.