Solar photovoltaic (PV) technology is already familiar - it is used to power calculators, road signs, toys and phone chargers by taking light from the sun, and using it to power the appliance. Solar PV panels for electricity generation work on the same principle, just on a larger scale, and produce electricity for use in your home or business. Daylight is all you need to get electricity from the panels. Although more electricity is produced on sunny days panels work well on overcast days too.