In the Jan. 13, 2016 issue of The Bird's Eye (www.thebirdseye.ca)
there was an interesting article "The coming of the Solar Age" by Greg Ross. He expects that photovoltaic (PV) solar panels will in the future become not only much cheaper and ubiquitous, but also so efficient that "we each will have just one solar panel the size of a tablet to power our home, car, and all electrical devices we own," and that "a small solar panel built into your chainsaw and other tools will allow you to use the tool nonstop all day, every day, just like today's solar calculators."
In the attached 5-page formatted document, I am trying to show that a chainsaw powered by a small built-in solar panel would never be possible. It also contains the discussion of solar cars (somewhat possible) and solar trains.