Ups for Routers

In developing countries, power shutdowns is common... We have electricity power generator as backup, but there is a small time interval of 20 seconds during change overs.

My router gets restarted and takes 3 to 5 minutes to reconnect..

And if you are in a meeting, it becomes annoying...

Regular UPS, needs 100 to 300W to run, a modem or router is hardly 5 to 10W..

In this instructable, I will share, how to assemble simple DC UPS

Features
- Input : 5v 1A
- Output : 8v 600 mA
- Runtime : approx 1hr
- Led indicator

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Update

I have been making and using DC Lithium ion battery UPS for few years now. Based on requests from friends and family, I have been modifying these circuits to support different setup and I think after 3 years, I have all the combinations as below, depending on your power requirement you can choose which version you want to make...

• Version 1 :This Page (5W)
  • Single Output 9V and 0.5A
  • Can be modified to set output to 5V, but not 12V
• Version 2:Link (15W)
  • Dual Output 9V/0.5A and 5V/1.5A
  • Can be modified to supply two 5V outputs
• Version 3: Link (24W)
  • Single output 12V/2A
  • Can be modified to step-down to 5 or 9V
• Version 4 : Link (36W)
  • Dual Output 12V and 5V
  • Output can be modified to both 5V or 9V
  • Or Single output at 12V