SV: RE: [sdiy] Multiple Voltage Power Supply / design problem!

[Roy J. Tellason]

On Tuesday 15 May 2007 17:53, Magnus Danielson wrote:
> > Soon that flatness will become DC mains! :-)
>
> Indeed. Most switchers can actually run perfectly from DC, and ETSI even
> has a standard for it - EN 300 132-3. The benefit is that for big UPSes you
> don't have to switch into AC again after the battery pack. Less losses.

Only to the wallet...

I had *one* UPS that wanted a total of _ten_ small batteries for replacement,  
as compared with typically one or two in the rest of the ones that I've 
encountered.

Too bad I can't seem to find any switchers which will accept a lower-voltage 
DC input.

-- 
Member of the toughest, meanest, deadliest, most unrelenting -- and
ablest -- form of life in this section of space,  a critter that can
be killed but can't be tamed.  --Robert A. Heinlein, "The Puppet Masters"
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Information is more dangerous than cannon to a society ruled by lies. --James 
M Dakin