SMA Sunny Island 4248U Inverter SMA's new off grid inverter - A technological leap into the future! The new Sunny Island 4248U battery-based inverter is the first off-grid inverter from SMA for use in the U.S. Perfect sine wave off-grid electricity is now available with high efficiency, robust power, and outstanding reliability. Simple to install and use, yet loaded with powerful and advanced features, the Sunny Island 4248U is designed to meet the needs of off-grid as well as backup power system applications.Whenever and wherever electric power is needed, the new Sunny Island 4248U will perform! Features Optimized for high ambient temperatures Very high overload capability High efficiency Integrated DC breaker Intuitive user interface Output load shedding DC and AC coupling of energy sources Nearly silent operation Automatic generator start Battery protection Insect proof Easy installation and commissioning Non volatile parameter settings Compatible with the Sunny family of products Electrical / Mechanical data Nom. Battery Voltage: VDC,nom 48 V Battery Voltage Range: VDC 41 - 63 V Nom. AC Voltage: VAC,nom 120 V AC Voltage Range: VAC 105 - 132 V Nom. AC Frequency: fAC,nom 60 Hz AC Input Charge Current: IAC,chrg 40A @ 25C, 28A @ 45C Max. AC pass through current (transfer relay): 60 A Consumption (no load operation): <22 W Consumption (standby): <4 W Total harmonic distortion: <3 % Temperature Range: -20C to +45C / -4.0F to +113.0F Enclosure: IP30 Weight: 86 lbs / 39 kg Size (WxLxH): 15.35" x 23.22" x 9.64" / 390 x 590 x 245 mm W 390 x L 590 x H 245 millimeters Interfaces 2 LEDs; 2-line LCD; 4 push buttons 1 dry contact output for load shedding 1 dry contact for generator start 1 generator-ready opto isolated input Accessories Remote battery temperature sensor (included) Generator Management Box (optional) 1 RS232/485 galvanic isolated for communication(optional)