Pulling the plug to test the backup battery is dangerous. Removing the ground can cause damage to the components. Flip the switch at the breaker.

You should check how many watts you need and get a UPS/AVR combo like this: http://www.amazon.com/CyberPower-CP1500PFCLCD-1500VA-900W-Compatible/dp/B00429N19W.

I just installed it on a DVR and back office computer. Pure sine wave. Gives me 30 minutes run time. Since I only use half that output.

Sandeep Luthra | LTMedical.net
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