You can know, what is a photovoltaic array by learning how to build solar panel systems. Basically huge collations of glass (an increasingly, plastic) plates are needed for this system. These are covered with a semiconductor material. These semiconductor materials may be of different types, which are available everywhere and anyone can get it easily. The process of learning how to build solar panel systems become very easy by the use of DIY kits and its cost is also very low. So if you have basic DIY skills, you can build a photovoltaic array system immediately. And it will keep your environment as well as earth free from pollution.