I am writing this on my IPad.   They turned the power off to the house to replace the main box pedestal holding the meters.  They said it would take between 4 to 6 hours but then we have to go to home depot and lowes to look at new toilets.   I was in the middle of writing a post when they shut the power off.  I have back up batteries for the modem and router and two much bigger one for the computers.  How ever with everything connected to them they have a run time of only 72 minutes.  Because I plug a lot more into them than just the computers.  I have the sound systems, the powered USB hubs, the set up that powers the extra drives I have.  Plus a few smaller items.  Like I said we use a lot of power here in this home.   I have left the the modem and the router on to see how long they will go on their back up battery.  Hugs