Comparison of Energy Conversion Efficiencies

Solar cells and energy payback
A common misconception is that solar cells never produce more energy than it takes to make them. The usual working lifetime is around 40 years, while the energy payback time of a solar panel is from 1 to 20 years, but usually under five. This depends on the type and where it is used. This means solar cells can be net energy producers, making enough energy to "reproduce" themselves (from just over once to more than 30 times) over their lifetime.

*Please not that some researchers dispute the above findings. They object that such analysis doesn't take into account waste, inefficiency, and related energy costs that would come with a real-world solar cell.



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