We ran a test with this: APC BR1500LCD 1500VA 865 Watts 8 Outlets BACK-UPS RS (No Longer Sold on NewEgg)
Mini server + 2 x 8 Port Gigabit Switches + Comcast Router + Security System
- Run: 170 minutes
- Load: 26w
- Load: 3%
Add in One Xserve Power Cable
- Run: 30 minutes
- Load: 160w
- Load: 20%
Add in Both Xserve Power Cables
- Run: 15 minutes
- Load: 280w
- Load: 33%