The word photovoltaic is a marriage of the words 'photo', which means light, and 'voltaic', which refers to the production of electricity. Photovoltaic technology generates electricity from light. Electricity is the existence (either static or flowing) of negatively charged particles called electrons. Certain materials, called semi-conductors, can be adapted to release electrons when they are exposed to light. One of the most common of these materials is silicon (an element found in, amongst other things, sand), which is the main material in 98% of solar PV cells made today. Advanced Energy Systems Development has partnered with Sanyo, Conergy, Xantrex, SMA, gro Solar, BP, and Sharp to provide you with the best available equipment for your gid tied or off grid photovoltaic system. Contact Advanced Energy Systems Development at our offices, 617 775-1720 or send us an email at advance1@advancedenergysystemsusa.com and we can get you started on your way to energy independence.