On Saturday 28 October 2006 19:51, Dale wrote: > I'm thinking you could make the capacitors on the high voltage side > MUCH larger so it would last longer. It would still have to be a > fast shutdown though. Something like shutdown -h -t -5 minutes ago. > LOL The only thing about that is charging them when you first turn on > the computer.
Your average psu uses around 5000 - 15000 uF caps on the mains side. That lasts about 3 mains cycles. I suppose you *could* rig up a 25F array but the caps will cost more than an average desktop machine (!) Batteries = much cheaper. The main reasons no vendor builds a UPS into the power supply: 1. Weight 2. Extra cost 3. Lead/acid battery = presence of sulphuric acid = bad news for motherboards alan -- gentoo-user@gentoo.org mailing list
