Calculating your potential payback period will depend on a lot of variables.

Confused about solar basics? Our guide simplifies solar energy for new home buyers. Learn how to harness the sun’s power and ...

the energy she produces is free. A solar-powered calculator. Its solar cells are just above the buttons, on the right. These cells generate the energy needed to make the calculator work.

3 min read Solar energy is the technology used to harness ... rooftops, and handheld calculators. The cells are made of semiconductor materials like those found in computer chips.