How to build a solar panel for less than $500?

With solar power generating more than $5 billion a year, the US government is set to expand its solar power program in a big way.The National Solar Initiative (NSI), which is aimed at developing new technologies that will reduce the cost of energy and reduce greenhouse gas emissions, is expected to generate $2.6 billion this year.While the total program is expected be worth $9.3 billion, that's ju...