This article talks about solar photovoltaic (PV) installer and features Rebekah Hren, a solar PV installer who puts solar panels on roofs and in other sunny places to turn the sun's power into electricity. Hren enjoys promoting renewable energy, in part because it's an emerging field. In solar PV systems, solar cells--devices that convert sunlight into electricity--are joined to create different types of solar modules, which are usually further connected. Solar electric systems can be installed on the ground, on poles, or on the roofs or sides of buildings. The U.S. Bureau of Labor Statistics does not publish employment data on solar photovoltaic installers. But industry sources suggest that there are about 7,000 solar photovoltaic installers--who may also be known as solar photovoltaic technicians or solar installer-roofers--in the United States. As the use of solar power expands, the job tasks of solar PV installers are evolving. Some workers concentrate primarily on installing the panels. Others, especially those at small companies, do everything from sales to planning to wiring. Experienced installers in any size company may advance to lead installer, system designer, sales representative, or other positions.