ALEKO SPU25W12V 25 Watt 12 Volt Monocrystalline Solar Panel for Gate Opener Pool Garden Driveway 25 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 Operating Voltage: 17.5 volts Open circuit voltage: 21.6 volts Monocrystalline panels have the highest energy efficiency and are space efficient for the power they output