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Fritzbox: Easy USV UPS AVM 7490 Battery Power

If you use a Router with IP Phones you perhaps want to have a Power Storage for up to 60 Minutes to use IP Phone or WIFI on Power Failures??

usv fritzbox 7490

Major Info:

  • Check the Router DATASHEETS! the Battery Voltage on loading should never go over maximum!!
  • Some Trafo wind up to 14Volts and more! This DESTROYS the DSL MODEM CHIP !!!!
  • The 10 Cell AA Batterholder allow to connect 9 Cells! Connect the Wire to only 9th Connector 9x AA 1,26V let the Router work
  • The Modem is protected cause the Circut runs under 12 Volts! 11,25 – 11,5V, the 0,5V lost on the Fuses and Diode.
  • 2 Fuses is a MUST HAVE! use always Fuses of 85% of the Router max Power (1,2Amps take 1A), it let the Fuse act faster!
  • The Trafo is the original Part. 12V 1,2A