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Want to understand the basics of solar and wind energy before you build your own system? If so, this is the book you need. You'll learn the difference between energy and power, how power is related to current and voltage, and how current is related to voltage and resistance. You'll learn about all the different parts of an alternative energy system, what their purpose is, and how they are wired. You'll also lean how to calculate the size system you need. Finally, you'll even learn where to place your solar array and what tilt angle to use. If you already have the knack for these things, this may be the only book you need before you start building.