Do some searches on wireless or fm. There is ton's or kilo's of info in the forum. Also if you don't know what your doing in the first place you will nuke yourself.
They will not answere someone if your just a beginner.
Edit: I did look to see your skill level. Sorry! It was just one of those questions that get under my skin.
Here is how I would do it. Take a bunch of car head lights (6V in case you haven't figured that out )
Then shine them on a solar panel. The number of lights and the size of the panel depends on the amount of power (W) you need.
When you have got this working please report back and inform us of the efficiency.
Please don't try to cheat by doing this outside in the sunshine.