This is a graph of solar panel efficiency over time: http://solartribune.com/wp-content/uploads/2011/07/nrel.gov-solar-cells-efficiency.jpg http://solartribune.

This is a graph of solar panel efficiency over time: http://solartribune.com/wp-content/uploads/2011/07/nrel.gov-solar-cells-efficiency.jpg http://solartribune.com/wp-content/uploads/2011/07/nrel.gov-... Dark blue encompasses most mass produced commercial panels. Notice there's no change since 2008, and even a modern panel is only a few percent more efficient than the one I used from 1975. Were you just guessing?