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Model Number SB4000US
AC Nominal Power (W) 4000.0
Peak Efficiency 0.968
CEC Weighted Efficiency 0.955
Weight (lbs) 88.0
Height (in) 13.8
Width (in) 17.8
Depth (in) 9.3

Sunny Boy SB4000US Inverter


SMA Sunny Boy SB 4000US Inverter Features Review:

  • Provides 4000W AC Maximum Output Power
  • Highest CEC efficiency in its class
  • Integrated load-break rated lockable DC disconnect switch
  • Integrated fused series string combiner
  • Sealed electronics enclosure & Opticool
  • Comprehensive SMA communications and data collection options
  • Ideal for residential or light commercial applications
  • Rugged cast aluminum outdoor rated enclosure
  • UL 1741/IEEE-1547 compliant
  • Field-configurable for positive ground systems
  • Increased efficiency for better performance and shorter ROI paybacks
  • Sunny Boy is known for PV inverter performance and reliability
  • 10 year standard warranty


The SB4000US has an integrated DC disconnect that makes installation more cost-effective. This inverter is field configurable for positive ground systems, this makes it more versatile than other grid tie inverters.

The included "auto-sensing technology" makes the SMA 4000US more flexible and easier to install than ever. It will automatically detect whether the output voltage is 208VAC or 240VAC.

The Sunny Boy 4000US is designed to support solar panels in series, increasing efficiency and eliminating the need for expensive DC distribution systems and cabling. Each Sunny Boy inverter is equipped with a separate and autonomous grid monitoring facility that enables the user to hook up the AC output to any point within the electric distribution system of house.

Sunny Boy system diagnosis and control can be transmitted to your PC via many means. These include RS485 and Wireless. You can even view your system statistics on the internet! (with optional system monitor)

Sunny Boy 4000US Inverter Specifications

SMA SB 4000US Inverter Specifications

SB 4000US Efficiency Curve

SMA SB4000US Inverter Efficiency Curve

Webbox Monitoring

Webbox Monitoring