The Lance J. Technoweb

I've had a traditional UPS powering my network rack for a few years now, but it isn't all that efficient because it sends DC battery power to an internal AC Inverter so that it can power gear, and that gear goes around and converts it back to DC.  It seems reasonable to skip this lossy process.  Here's how I did it. Uninteruptable DC Power Supply Diagram   Backup Voltage and Power My network's gear uses various voltages: 12 Volts, 24 Volts, and 5 Volts.  So my overall goal is to have three voltages available for my various devices.  Sadly, the computer UPS market doesn't seem to want to deliver any devices to satisfy these needs... at least nothing affordable. But there is another huge industry that had this need, and that's the world of small business security.  And in particular, small apartment buildings that use electronic locks!  They don't want their buildings to be inaccessibly locked during a power outage, and so they use battery backups all the time