Photovoltaic ("PV") or "solar electric" systems are gaining strong acceptance worldwide due to rising energy costs, falling equipment costs, environmental concerns and attractive rebates and incentives. PV uses semiconductors to convert sunlight into electricity, just like a solar-powered calculator, but on a much, much bigger scale. PV is completely electrical and does not use any plumbing like a solar hot water system does. PV is a complete electrical system hard-wired to your home's electrical system. During peak solar hours, you can watch your electric meter actually spin backwards.