[CentOS] Power-outage

[Marko Vojinovic]

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.

Best, :-)
Marko