Most homes already have a smart meter that digitally communicates with the electric grid. If you're looking to get rooftop solar panels, a smart meter is an essential piece of equipment. Here's why.

Technically, the output of a residential solar panel can be anywhere from 100 watts to 500 watts, depending on the capacity of the equipment and its operating conditions. Most solar panels on homes ...

Add Yahoo as a preferred source to see more of our stories on Google. Discover average solar panel output and how it varies by region (Getty Images) If you’re considering whether solar panels are ...