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Switchers I Have KnownAppropriate power supplies pop up on eBay all the time. Of course not every switching power supply is going to work: You need one that can accept 200-240VDC. They are normally rated for AC operation, and it will take some digging in the specs or a call to the manufacturer to confirm that they will run on DC. Once you have selected your switcher, you will need a UPS whose battery voltage is commensurate with its output voltage rating. Again, it may take some digging to find out. Typically the UPS manufacturers specify a replacement battery pack without bothering to tell you its voltage or current rating. But you can usually get the info without too much trouble. Finally, you should (if possible) select a UPS that allows connection of external batteries for extended run time. This will not only make it easier to connect, since the switching supply can be connected to the external battery connector, it will give you some assurance that the UPS is rated for more-or-less continuous duty. Here are switchers I have found that are suitable. I'll add to the list as I find more.
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Updated 26 April 2006 |