48v dc power

From: John Foust <jfoust_at_threedee.com>
Date: Thu Oct 12 09:57:28 2000

At 05:54 PM 10/10/00 -0700, Chuck McManis wrote:
>Why not buy a "dead" UPS that can over the wattage of your system and
>install a 12V in plug on the back. Most of these use a 12V DC input and
>provide acceptable power on the output. Its cheaper than simply buying a
>12V -> 120V inverter _at_600Watts or so.
At 07:30 PM 10/10/00 -0700, Shawn T. Rutledge wrote:
>Because it's grossly inefficient. Why convert from 12V to 120V AC and
>then back to 12V, 5V, etc... they design some really efficient DC-DC
>converters for laptops (to convert battery voltage to 5V) so it should
>be possible (cheaply) for desktops also.

Not only have I wondered about the most efficient way to
power a PC inside a car, but other devices... a few months
back I was looking for a 12 volt to 6 volt converter to
power a Sony GV-9 video deck in the car, to no avail.

All the units I found were too low in amps-out. I avoided
the 12v -> 120v -> wall wart solution as too gross and inefficient,
but I guess it would work.

- John
Received on Thu Oct 12 2000 - 09:57:28 BST