Guided by an advisory board of academic experts and solar professionals, the PSI PV Module Rating is based on physical tests by independent laboratories such as TÜV Rheinland, but is presented as a single comparative number that can be used with circumstantial information such as deliverability, pricing and manufacturer reputation so that solar power plant designers, buyers and financiers have a consistent basis for choosing a particular PV module. The system empowers these decision-makers to make informed, intelligent comparisons and determinations when selecting PV modules.