At Sat, 02 Jul 2011 15:42:38 +0200 CentOS mailing list centos@centos.org wrote:
Jason Pyeron wrote:
Could you (or anyone) suggest a cheap UPS? This is only a tiny server (HP MicroServer) on a home LAN.
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?
Actually not. You need both positive and negative voltages. You cannot just use a 12v battery with a voltage divider resistor network. And because the voltages needed have to be precise, you really need a properly regulated power supply. Like Jason said, it would be a 48VDC input unit and will cost you many times what a cheap UPS would cost.
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 ...