555 DC AC inverter

burnhard gandah

How are you EEs. I would like to use my 12V car battery as backup power for a 72W television so that I can watch every minute of 2006 soccer world cup action (in case of Electricity company power cuts).

After some searches I found this inverter http://www.uoguelph.ca/~antoon/circ/555dcac.html

I intend to build this or another simpler and cheaper inverter
But I have the following questions
1)What is the power rating of this inverter, is it suitable for my TV.
2)What is its efficiency is it possible to run a 12V battery through this inverter for more than 120 minutes (in case the match goes into extra time)

If there is a simpler, cheaper alternative circuit can you give suggestions please.

NB: Do not suggest that I buy one from shops