If you ever wondered how a PV solar energy system works , or wanted to design your very own PV solar system, but were afraid to ask, this is the right application for you. Even if you have zero technical or electrical knowledge, this application will first teach you the basics to get you started. Then it introduces and explains the functions of the basic elements of a PV solar system. And finally, it will guide you step by step on how to design your very own PV solar system from the ground up. After reading the tutorial sections in the application, you will have the choice of doing your very own mathematical calculations to design your PV solar system or you just use the tools and calculators included in this application do the calculations for you. This application and its tools can also be used by experienced PV solar professionals who don’t want to bother doing calculations from scratch. Either way, reading the tutorial section first, will help you refresh or add on new electrical knowledge and will facilitate understanding and using all the tools in this application. The final section of this application shows drawings of the several types of PV solar systems that could be implemented . This application has the summarized material of a textbook, but for the price of about $1.00 US dollar.