Before you design a PV system for a home or commercial building, you need to know how much energy is being used at that location. That energy need helps you determine the size requirements of a PV system to meet that energy need. You also need to know how much energy can be produced by a PV system, because it varies based on the amount of sunlight available. In this week's module you will learn how to differentiate and calculate power and energy for both energy consuming appliances and energy producing photovoltaics, and then apply those concepts and calculations to assessing energy needs and energy production potential at a site.

Photovoltaics is a growth industry. In this module you will be learning about the historical development of photovoltaics, the current trends, and some of the future forecasts of the market both globally and with a little bit of a closer look at the United States. Finally, you'll be learning about the segmentation of photovoltaics into different applications beyond just solar panels on a house or a solar farm.

The field of photovoltaics engages many people filling many different roles. In this module you will learn about the different stakeholders and job opportunities in PV. You'll also learn about some different certifications available to those already working in the photovoltaics industry and for those interested in joining the field. You'll also learn about the different financial models associated with PV systems that underpin the implementation of on-grid PV systems. When you finish this module I would recommend at least starting your work on the capstone project rather than waiting until the following week.

In the capstone project you will be applying some of key skills you have learned so far in this specialization. You will need to evaluate a site's location, calculate it's energy consumption and try to reduce it's load, and then design a solar array capable of meeting it's total energy load using data from commercial modules and using a simplified assumption about system efficiency as we have been doing in this course.