How it Works

Sunlight is one of our best sources of renewable energy. In 1839, French Physicist Alexandre-Edmund Becquerel discovered a phenomenon known as the photovoltaic (PV) effect, which is the basis of solar, or PV, energy.

Photovoltaic energy starts with PV panels. Most PV panels are made out of silicon, a semiconductor material. When sunlight strikes the panel, the silicon creates an electrical charge. A metal conductor strip consolidates this charge into a single current that streams into your home to power lights, appliances, and other equipment.

Most PV panels are installed on roofs because they receive unobstructed sunlight for several hours during the day. Panels can also be mounted on the ground.

In order to maximize the energy received from the sun, PV panels installed in the New England area should face south. If this isn't possible, west- or east- facing panels will still receive enough sunlight to be effective. The angle or tilt of the panels also impacts the efficiency of your PV system. For maximum generation in Massachusetts, a solar array should be installed at about a 30-degree angle to the horizon. Don't worry if any of this sounds confusing. Your PV installer will conduct an assessment of your home as part of the preliminary installment process and make recommendations based on your roof location and land availability.

* The information on this site came from a variety of resources. For a complete list, please go to our Resources page.