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I always thought that using a conventional UPS with a PC is highly inefficient. Power goes from AC -> DC -> AC in UPS and then AC -> DC in PC SMPS. Since PC works only with DC (12, 5 and 3 volts) It should be possible to convert AC -> DC once and use that to charge SLA battery and drive a PC.
Sure enough there are solutions for this. For example PicoUPS-100. These are designed for embedded PC, but I see no reason why such a device cannot be used for home PC also. Place where I live has frequent power outage and if I can hookup couple of battery with such a system it would give me long battery backup time with minimal cost if I use a power efficient PC.
Does any one have any experience with such systems for a mainstream (home) PC.
1This makes me think it's only a matter of time until power supplies have their own UPS built in. – Scott – 2009-07-15T18:18:03.357
I've thought about this for some time, you should look into Zenner Diodes, 12V car batteries and home made battery chargers ;) – voyager – 2009-08-04T01:33:02.560
2@voyager: the Zener diode in those battery chargers is used as a voltage reference. The constant voltage is then used with a potentiometer for manual adjustment of the set value for the battery voltage. – Peter Mortensen – 2009-08-04T10:44:03.373
Google implements something very close to this for the trip delay between main supply going down and their UPS coming back up. Gigabyte makes custom boards for this, see if you can grab one at the regular Google sales. – PoorLuzer – 2010-10-25T00:21:08.400