Sunny Boy 3000TL-US/4000TL-US/5000TL-US inverters include a Secure Power Supply function, which allows the inverter to provide up to 1,500W of daytime standby power in the event of a grid outage. The transformerless design ensures high efficiency and reduced weight, and a simplified DC wiring concept allows the DC disconnect to be used as a wire raceway. Tested to UL 1741 and 1699B standards, the product features an integrated AFCI to meet NEC 2011 690.11 arc fault requirements. Additional features include: an operating temperature range from -40°F to 140°F, optional plug-and-play Webconnect data module for system monitoring, direct data direct data transmission from Sunny Portal, and a large graphic display. Communications via Zigbee is also available.