The Dell of Solar Energy - good article that explains why 50% of the cost of a solar installation is in the installation. The need to make every installation custom, the more than one trip needed, etc. Sounds like there is a lot of potential for reducing installation costs. Prewiring was just one example mentioned in the article. As the number of installations increases the learning curve and resulting cost reductions will help.
I would not be surprised if within 5 years, solar is 50% of the cost is it now due to lower solar cell and installation costs.
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