Mailinglist Archive: opensuse (1620 mails)

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Re: DC-DC thoughts (was "Re: [opensuse] UPS : replacing battery ...")
On 2014-11-25 16:08, James Knott wrote:
On 11/25/2014 09:13 AM, Carlos E. R. wrote:

No, I mean technically. Where to find the convertors and the rest of the
hardware, how to design it... and of course, calculate costs and savings.

A lot of telecom and industrial network equipment runs on -48V DC,

I know. I'm a 5ESS specialist :-)

But it was very expensive equipment. I believe there is a range of
cheaper items on 12/24 volts, which apparently is common on home solar
powered setups.

provided by batteries. Also, many server sites run the computers on
high voltage DC, to eliminate the AC-DC and DC-AC conversions.

makes sense.

could probably modify a typical computer power supply for that, but
you'd need a string of about a dozen 12V batteries to run it.

I saw, time ago, 12V desktop computer power supplies. You "simply"
replace the original unit.

switching power supplies rectify the incoming AC and use the DC to run a
power oscillator at a high frequency that's then passed through a
transformer to be rectified and regulated at the desired voltage. In
North America, that DC would be in the vicinity of 150V.


What I was thinking, though, is to power the laptop that I use as server
with a dc-dc adapter, instead of the original ac-dc adapter, and do the
same thing for several low power gadgets, like the router or the
wireless phone. I think I have seen laptop adapters for cars, ie, 12v.

If I can not get suitable solar panels, the project is moot: as David
T-G says, it does not make sense as I have "unlimited" ac. Interesting
idea, looking at boating things. I live by a harbour, so there should be

(the desktop would remain on mains only)

[rant] Unfortunately, our government killed alternative power
initiatives, via heavy taxes and removing incentives. Thus the solar
home gadgetry has almost disappeared from shops. They chose to pay
tribute to the traditional heavy electricity players instead. [/rant]

Cheers / Saludos,

Carlos E. R.
(from 13.1 x86_64 "Bottle" at Telcontar)

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