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Getting to the point where the amount of energy it will require to get the panels out of Mars' gravity will be less than the energy delivered will take a long time. And what are you going to do when something breaks down?

You're 32 years late on that idea: http://www.islandone.org/MMSG/aasm/

As it stands, we have not yet built a factory using exclusively robots. I'm sure that this would have very useful applications on Earth, as well as on Mars, if you were interested in tackling it :).

If you want to start somewhere: http://phys.org/news/2010-12-sahara-aims-power-world.html