Solar photovoltaic panels come in three basic dimension dictated by the number of cells in the architecture of the panel design; 60 cell, 66 cell, and 72 cell panels.
- The standard residential 60 cell panel is approximately 38” x 68” dimensionally, which equates to a surface area of 18 sq./ft., with a panel rating of 365 watts. So assume 50sq/ft. for every 1000 watts of solar PV required to meet your needs.
- The standard residential 66 cell panel is approximately 41” x 74” dimensionally, which equates to a surface area of 21 sq./ft., with a panel rating of 400 watts. So assume 52sq/ft. for every 1000 watts of solar PV required to meet your needs.
- The standard commercial 72 cell panel is approximately 41” x 83” dimensionally, which equates to a surface area of 23.5 sq./ft., with a panel rating of 450 watts. So assume 52sq/ft. for every 1000 watts of solar PV required to meet your needs.
So in reality most roofs have plenty of space, as a 20’ x 20’ roof is 400 sq./ft.
