[Bulk] Re: OT: UPS for FreeBSD

[Ralf Mardorf]

On Sat, 29 Nov 2014 11:34:05 +0800
Erich Dollansky <erichsfreebsdlist at alogt.com> wrote:
> On Fri, 28 Nov 2014 17:26:03 -0800
> Michael Sierchio <kudzu at tenebras.com> wrote:
> 
> > I've always found it amazingly absurd that you use a UPS (a bank of
> > batteries charged by AC->DC conversion), invert it back to AC, which
> > gets converted to DC for the motherboard and peripherals.
> 
> a long time, this was not the case. It was the time when linear power
> supplies were the standard. A batterie was supplying electricity via a
> diode to the DC input of the voltage regulator.
> 
> As switching voltage regulators use a few hundred volts, it is a bit
> difficult to match this with a battery.

Instead of getting an UPS to feed the PSU, it would be smarter to
replace the computer's PSU with a combination of UPS and PSU. There's
no good reason for a double conversion.