ALEKO SPU15W12V 15 Watt 12 Volt Monocrystalline Solar Panel for Gate Opener Pool Garden Driveway 15 watt monocrystalline solar panel with a nominal output voltage of 12 volts A solar panel will lower the costs on your power bill and help curb your carbon emissions Open circuit voltage: 21.6 volts Monocrystalline panels have the highest energy efficiency and are space efficient for the power they output Product dimensions: 19.5 x 15 x 1 inches