> -----Original Message-----
> From: centos-bounces@xxxxxxxxxx
> [mailto:centos-bounces@xxxxxxxxxx] On Behalf Of Marko Vojinovic
> Sent: Saturday, July 02, 2011 13:10
> To: CentOS mailing list
> Subject: Re: 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@xxxxxxxxxx>
> 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
>
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