Insulation

Photovoltaic panels are a method, of converting solar energy into a current of electricity.

The system traps the sun rays, with the panels on the roof. The rays are also known as,photons or particles of light. Then  the panel knock electrons  free from the atom, then that generates a flow of electricity to power consumers around the house.

The solar panels hold many smaller units called cells.

They are very beneficial because they cut costs, and they cost nothing to run. And they will last a life time. I think they are great invention, and within three years they will pay off! and don't forget they pay themselves off completely by the sun