Combining a wide input voltage and input current range, the transformerless Sunny Boy can be connected to nearly all standard crystalline PV modules. As a proven entry-level model, its efficiency is first-class. Its low weight and robust enclosure make installation easy, both indoors and outdoors. With its three power classes, it is the ideal inverter for smaller PV systems.
– See more at: http://www.sma.de/en/products/solarinverters/sunny-boy-1300tl-1600tl-2100tl.html#Overview-8639