Generate a Solar Permit Package for a design using SMA ST42US

With SolarDesignTool, you can create a design from scratch and generate a full PV permit package in as little as 15 minutes.

This page contains information about the SMA ST42US inverter. To compare this to other PV inverters, click here.

DC Electrical Properties

  • Maximum Input Current 180A
  • Start Voltage 300V
  • Max DC Input Voltage 600V
  • Peak Power Tracking Voltage 250V - 480V
  • Number of MPPTs 1
  • Polarity of Ground Either
  • DC Disconnect Yes
  • DC Terminal Quantity 24
  • Includes Fuses for String Inputs Yes
  • Max Rating for String Fuses 20A
  • Rating of Included String Fuses 15A
  • DC Input Wire Gauge Range 10 AWG – 6 AWG
  • Integrated DC Arc Fault Protection No

AC Electrical Properties

  • Rated Power Output 42000W
  • Compatible Utility Voltages 208V, 240V, 277V
  • Peak Efficiency 97.1%
  • Weighted Efficiency 95.5% (208V)
    96% (240V)
    96% (277V)
  • Maximum Output Current 117A (208V)
    101A (240V)
    51A (277V)
  • Max OCPD rating data not available
  • AC Disconnect Yes
  • AC Input Wire Gauge Range data not available
  • Sleep Consumption 0.6W
  • Standby Consumption data not available

Mechanical Characteristics

  • Height 70.5in (1,791mm)
  • Width 43.3in (1,100mm)
  • Depth 39in (991mm)
  • Weight 1,176lb (533.4kg)
  • NEMA Enclosure Rating NEMA 3R
  • Cooling Method Forced Air

Environmental Constraints

  • Ambient Temperature Range -13°F - 113°F (-25°C - 45°C)

Warranties and Compliances

  • Compliances UL 1741, UL 1998, IEEE 1547
  • CSI Listed Yes

This web page is not the manufacturer's official data sheet and is not endorsed by the manufacturer in any way. For an official data sheet, please go to SMA's website.