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SMA Sunny Boy 3.8kW 208/240VAC TL Inverter, SunSpec Compliant, SB3.8-1SP-US-41

The residential PV market is changing rapidly. Your bottom line matters more than ever - so SMA designed a superior residential solution to help you decrease costs at every stage of your business operations. The Sunny Boy 3.8-US joins the SMA lineup of field-proven solar technology backed by the world’s #1 service team. This improved residential solution features ShadeFix, SMA’s proprietary technology that optimizes system performance. ShadeFix also provides superior power production with a component count versus competitors, which provides maximum reliability. No other optimized solution generates more power or is as easy as systems featuring SMA ShadeFix and SunSpec certified devices. Finally, SMA Smart Connected will automatically detect errors and initiate the repair and replacement process so that installers can reduce service calls and save time and money.

The SMA Sunny Boy SB-41 series of transformerless single-phase residential inverters can be used for both residential single-phase applications. These inverters utilize multiple independent MPPT channels, allowing more stringing options. The integrated DC disconnect simplifies and speeds installation. Solar array monitoring through SMA's Sunny Portal has also has been simplified, as these inverters ship with factory-installed WiFi capable data loggers that enable fast and easy connection to the Sunny Portal platform, and can be field configured via a laptop, smartphone, or other WiFi-enabled devices.

SMA's unique Secure Power Supply feature has been improved, and now can supply up to 2,000 W of opportunity power in the event of a grid outage, as an increased value-add opportunity.

Power+ MLPE devices with the ROOFCOMKIT-P2 can be utilized for states that have adopted NEC2017 code to provide module-level optimization, shade mitigation, and/or rapid shutdown functionality, based on needs and price point. These inverters are now Sunspec compliant, and can also use the new TS4-R-F MLPE devices to comply with NEC2017 module-level RSD, without needed the ROOFCOMKIT. In states still enforcing NEC 2014 code, the SMA Rapid Shutdown Boxes and Controller can still be used.


  • Integrated AFCI for arc-fault protection
  • ShadeFix optimization
  • Operating temperatures of -40 F to +140 F
  • UL 1741, UL 1998, UL 1699B Listed
  • IEEE-1547, CA Rule 21, NEC 2017, and FCC Part 15 (Class A and B) Compliant
  • 10-year warranty, with 5-year and 10-year extensions available

Technical Specifications

Continuous AC Power Output
3800 W
Max Operating Voltage
550 V
Min Operating Voltage
100 V
AC Voltages
208, 240 VAC
AC Frequencies
50/60 Hz
1 Phase
Maximum DC Input Voltage
600 VDC
Maximum DC Input Current
18 A
Peak Efficiency
97.36 %
CEC Efficiency
96.4 %
Number of MPPT's
Enclosure Ratings

General Information

String Inverter


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