Good post on a good energy blog

Here

His claims of useful energy conversion efficiency:
40% fancy solar cell for spacecraft
35% fossil fuel power plant
28% all electric car (80% battery * 35% power plant)
15-25% human metabolism
15-25% burning gasoline for locomotive power
15% mass-market polycrystalline solar cell
5% photosynthesis

He claims 15% efficiency of solar panels is pretty good. I agree.

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