[CentOS] Power-outage

[Christopher Chan]

On Saturday, July 02, 2011 09:42 PM, Timothy Murphy wrote:
> Jason Pyeron wrote:
>
>>> Could you (or anyone) suggest a cheap UPS?
>>> This is only a tiny server (HP MicroServer) on a home LAN.
>>
>> http://www.amazon.com/APC-Back-UPS-shutdown-software-UPS-
> BE350G/dp/B001985SWW/
>
> Thanks, I'll look into that.
>
>>> 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?
>
>> You will either need many different batteries for the different voltages
>> (1.2, 3.3, 5, 12, -12, -5) or a DC ATX power supply (not cheap and not
>> very powerful until the 48V input variety)
>
> Surely one 12v battery would do?
> It is only meant to last for 30 seconds or so,
> so wouldn't reducing the voltage be easy enough?
> I repeat that I don't know what I'm talking about ...
>

The PSU transforms incoming electricity to various voltages on multiple 
rails. You need more than just a 12V lead acid battery.