Build a 555 DC AC Inverter for a 72W TV & 12V Car Battery

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A user seeks to build a 555 DC to AC inverter to power a 72W television using a 12V car battery during power outages. Key questions include the inverter's power rating and efficiency, specifically whether it can sustain operation for over 120 minutes. The discussion highlights the importance of calculating the current draw and the battery's amp-hour rating to estimate runtime. Suggestions for simpler and cheaper alternatives to the proposed inverter are welcomed, while purchasing a pre-made inverter is discouraged. The conversation emphasizes DIY solutions for backup power during events like the 2006 soccer World Cup.
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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
 
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It is not worth your time and money to make your own inverter. 75W inverters that plug into your cigarette lighter socket cost only a few dollars.
 
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I see this is old, but if you are interested in DIY inverters, I took an old Uninterruptible Power Supply (UPS) and hooked it to a car battery. First I took some needle-nose pliers, and pulled the piezzo buzzer cap off so it wouldn't have the annoying beep, because it thinks the power is out.
To figure out how long a setup will last, figure how many amps you will draw at 12 volts, then find the amp-hour rating of your battery
 

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