From sloped roof installations to flat roof tilt-up arrays and building integrated models, possibilities for commercial solar power generation are varied and numerous. Companies joining in on the solar trend have the added bonus of selling excess power to the utility for money in the form of credits and savings. The basic principle behind solar energy systems is relatively simple: solar panels installed on a roof or set of buildings generate DC power via photovoltaic cells; a solar inverter transforms DC power to AC, which travels to a breaker box, which supplies the company’s electricity. According to power company Constellation Energy, companies need to take some issues into consideration before they take the path to a cost-effective solar-powered enterprise. The size of the system is a key factor in long-term cost savings and profitability, as it has to be large enough to generate sufficient energy to offset the costs of the investment. As of publication, the company says that ...