ALEKO SP30W12VP 30 Watt 12 Volt Polycrystalline Solar Panel for Gate Opener Pool Garden Driveway 30 watt polycrystalline 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: 22 volts Open circuit voltage: 17.5 volts Polycrystalline panels are less expensive and produce less waste silicon than monocrystalline panels