To me a solar cell is kind of like a Lamborghini: difficult to acquire, difficult to maintain, and unless you’re extremely lucky, only semi-functional. Today’s solar cells only convert a small percentage of the energy from the sun into electricity, and that’s before they get dirty.  “It’s challenging to get high efficiencies of conversion. For example, the basic single junction solar cell is fundamentally limited to an efficiency of 30 percent. So, if you made a perfect solar cell, the highest efficiency would be 30 percent. Currently, manufacturing cells with anything near that …