Today, in some regions, PV installations are a relatively substantial part of the electrical market, and as PV becomes a more relevant actor in power systems, the corresponding requirements and regulations for the safe and reliable use of PV systems are being standardized. In general, two groups of requirements can be considered when a PV installation has to be designed, built, tested, and commercialized. These two groups are the performance requirements and the legal regulations that the PV converters and the PV installations have to meet.