The new and improved Sunny Boy series of grid-tie transformerless inverters (US-41) fulfills UL 1741, NEC 2014, and NEC 2017 requirements and is compatible with the power line-based SunSpec Rapid Shutdown protocol.
In addition to being the simplest and most cost-effective rapid shutdown solution on the market, the US-41's most impressive feature is its Secure Power Supply: the ability to send up to 2000 Watts to a dedicated outlet inside the house when grid power is offline but the sun is still shining - without the use of batteries. To use the Secure Power Supply, you'll need a switch, outlet, junction box, conduit, and wiring (not included) that will be wired directly to the Sunny Boy inverter to receive these 2000 Watts (installation instructions here).
The Sunny Boy 3.8-US-41 inverter is rated at 3840 Watts at 240 volts. It features multiple independent input channels - each with SMA's OptiTrac™ Global Peak - allowing for hundreds of stringing configurations for flexible system design and improved performance for PV arrays that face the challenges of complex roof shapes and shading.