ALEKO&reg; 10W 10-Watt Monocrystalline Solar Panel 10 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: 11 x 13.5 x 1 inches