From: Niall O Broin <niall at magicgoeshere.com>
To: ilug at linux.ie <ilug at linux.ie>
Date: 29 June 2000 18:39
Subject: Re: [ILUG] UPS for home use?
>On Thu, Jun 29, 2000 at 04:22:07PM +0100, Wesley Darlington wrote:
>>> Me, I think it's a shame that servers don't have upses/batteries built
>> into them so one can disconnect the power for a few seconds/minutes
>> with impunity. *Sigh*.
>>I've never had my hands on one, nor even seen one, but I have read about a
>power supply in standard PC format which had a built in UPS (only extra
>thing needed is batteries across the DC outputs, all the AC/DC stuff being
>there already). I don't imagine it lasted long - probably just long enough
>to survive a brownout or carry out an orderly shutdown.
Easy enough to do for yourself...
1. Get a 12v Truck battery (Wait until the truck owner is not with the
vehicle. It's hard to run with a 20Kilo box sloshing HCL all over the
2. Hook up 12v to the 12v output of the PSU and set up a potentiometer or
other voltage changing device to provide the 5v output.
3. Put a diode on the incoming 12v line to prevent feedback (I think the
diodes in the PSU rectifier will prevent any feedback through the trafo).
4. Hook up a charger to the battery.
If you wanted to get fancy, you could scavange an old PSU for the four-pole
connectors and wire them up. Then, you could hook up and unhook just by
using a disk power connector in the (any) case.
No software warnings though!
If you want a portable solution, you can get small sealed lead-acid 12v
batteries with enough capacity for a reasonable time. Some might be small
enough to keep inside a tower case!
General Forecast Division
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conor.daly at met.ie
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