[Bulk] Re: OT: UPS for FreeBSD

[Erich Dollansky]

Hi,

On Sat, 29 Nov 2014 05:04:05 +0100
Ralf Mardorf <ralf.mardorf at rocketmail.com> wrote:

> 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.

have you ever tried to make two voltage regulators feed the same output?

Erich