The SWR 2100U is the ideal inverter for new or existing home power systems with outstanding quality and performance at a price that is affordable. The Sunny Boy's unsurpassed reliability and efficiency are the result of SMA's manufacturing philosophy that combines simple design with robust execution. SMA's state-of-the-art maximum power point tracking performance results in greater real-world energy capture. Sunny Boy's safety and reliability record is also exceptional due, in part, to the inverter's redundant grid monitoring and built-in ground fault detection and interruption protection. The inverter's IGBT power stage generates a nearly perfect sine wave with the lowest harmonic distortion in the industry and meets ultra-strict FCC EMC standards. SMA's unique string inverter technology makes future system expansion simple. SMA's advanced communication options are available to satisfy nearly every application. Features: UL 1741 Listed for grid interactive inverters 5-year comprehensive warranty standard Rugged NEMA 4X stainless steel enclosure standard Exceptional reliability and energy capture ratio Easy to install three-point mounting system Comprehensive communications and data collection options SMAs modular string inverter design is expandable to virtually any size system