How many watts do i need for a solar panel on the car?

Question: i want to take my small 14'' tv, and xbox 360 in the car with me. i checked on ebay, and the watts vary from 2.5 watts to 100+. im not sure what i need. can anyone help?

Answer:
Get a multimeter from Radio Shack and measure the amperage of these devices.

Multiply the voltage times the current to get the power in watts. Understand also that the output of solar cells will vary with solar intensity. Run your stuff off a battery, and use the solar to charge.

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