From The New York Times

How do home solar systems work?

Solar photovoltaic (PV) panels are made from silicon cells that join together to form a circuit. The panel collects the sun’s energy and makes direct current (DC) electricity. An inverter changes the DC electricity into alternating current (AC) electricity, which is what most homes use. The inverter is a metal box connected to a meter, which in turn is connected to the utility’s electric grid.

Do I need a new roof?

Most installers prefer a roof that has been fixed or replaced within the last five years. This is because the roof must be sturdy enough to support a mounting system and a rack.

What happens when it snows?

The snow typically melts right off the panels, especially if the panels are tilted…

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