The five activities in this lesson are designed for technology and upper-level physics classes, as well as being suitable as an introductory photovoltaics unit for college-level students and adults. Included in the activities are investigations on the parameters that affect the electrical output of photovoltaic modules and arrays—irradiance, tilt angle, azimuth, local insolation, temperature, efficiency, and shading. Also included is an activity on series and parallel circuits and the combination of the two in wiring arrays, as well as a discussion on site selection for a photovoltaic array.