Some of the best states to install a rooftop solar photovoltaic (PV) energy system are in the northeast: Massachusetts, New Jersey, New York and Pennsylvania come to mind. At this time of the year, these states are also known for their heavy snowfall. Unless you've been under a rock for the past few weeks, you've probably heard about the record-setting blizzard blowing through the northeast.
A number of factors impact the performance of solar photovoltaic (PV) panels, namely: (1) the size, number and efficiency of your solar PV panels, and (2) how much sunlight you get throughout the year. But there's an even more obvious factor that can impact a system's output: cleanliness.