ShadeFix produces more energy than traditional optimizers

The Sunny Boy-US 3.0-US / 3.8-US / 5.0-US / 6.0-US / 7.0-US / 7.7-US

ShadeFix produces more energy than traditional optimizers

The Sunny Boy-US series features ShadeFix optimization!

The residential PV market is changing rapidly. Your bottom line matters more than ever—so we’ve designed a superior residential solution to help you decrease costs at every stage of your business operations. The Sunny Boy 3.0-US/3.8-US/5.0-US/6.0-US/7.0-US/7.7-US join the SMA lineup of field-proven solar technology backed by the world’s #1 service team, along with a wealth of improvements.

The Sunny Boy-US brings even more value- added features to the Power+ Solution, including:

  • SMA ShadeFix optimization offers superior energy production with a reduced component count versus traditional optimizers, which provides maximum reliability

  • SunSpec certified rapid shutdown technology is the simplest way to achieve compliance with NEC 2017

  • Advanced AFCI compliant to new Standard UL 1699B Ed.1 for arc fault protection – delivering improved safety and reliability while allowing for automatic resetting

  • Streamline your business operations and provide added value to your customers with SMA Smart Connected

  • California Rule 21 compliance is fast and easy! Check the Downloads tab for configuration files


Click the “Downloads” tab for the latest:

  • Firmware updates

  • Technical documentation

  • And more!

Looking for previous generation firmware updates?

Click here

Temporary unavailability of Wifi functionality

Important supply chain update

Check SMA compatibility with your SunSpec certified shutdown devices

Access our compatibility document to ensure interoperability with your SunSpec certified devices and SMA inverters. Please refer to the compatibility document for updated information and specific model numbers.

View compatibility document

PV performance optimization with SMA ShadeFix

Did you know PV solutions with SMA ShadeFix optimization outperform traditional module-level optimizers? SMA’s propriety technology produces more power, speeds installation, reduces service requirements, and improves safety.

Learn more on SMA ShadeFix

SMA’s SunSpec certified shutdown device

SMA’s SunSpec certified rapid shutdown device offers the fastest, most reliable, and safest method for complying with NEC 2017 690.12. Using far fewer components than more complex alternatives, SMA’s SunSpec certified shutdown device is a plug-and-play solution that operates on a simple powerline signal, reducing commissioning requirements. The device operates on the industry standard SunSpec rapid shutdown signal, improving performance and reliability.

For more information on the SunSpec rapid shutdown standard or the SunSpec Alliance, click here.

What is SMA Smart Connected?

However infrequent they occur, service calls can be lengthy, unnecessary and will most certainly impact a PV installer’s bottom line. SMA’s new Smart Connected feature offers a proactive solution that saves installers time and money while maximizing system owners’ power production. This fully-automated functionality requires only a simple activation in Sunny Portal and a residential PV system will immediately benefit from SMA’s intelligent monitoring technology. No other solar solutions provider can offer this level of investment security, making SMA the ideal partner for residential PV.

How does SMA Smart Connected work?

Activation of SMA Smart Connected

During registration of the system in Sunny Portal, the installer simply checks a box to activate SMA Smart Connected which commences automatic inverter monitoring by SMA.

Automatic inverter monitoring

SMA automatically monitors the inverter to identify events around-the-clock. Both installers and their customers benefit from SMA's many years of experience diagnosing sophisticated inverter technology.

Proactive communication

After a fault has been diagnosed and analyzed, SMA informs the installer and PV system operator immediately by email. So all parties are proactively prepared for the troubleshooting process ensuring minimum downtime and reducing truck roll costs.

Replacement Service

In the rare event that a replacement component is necessary, SMA automatically supplies a replacement component within one to three days of the fault diagnosis. The installer can then contact the PV system operator of his/her own accord and repair the inverter immediately.

Sunny Boy 3.0-US / 3.8-US / 5.0-US / 6.0-US / 7.0-US / 7.7-US


SMA Cellular LTE Modem Kit

The SMA Cellular LTE Modem Kit allows for direct data transmission between the Sunny Boy inverter to the cloud based Sunny Portal via a cellular network as an alternative to data transmission via Ethernet or WLAN.


SMA Revenue Grade Meter Kit

SMA Revenue Grade Meter Kit is a revenue-grade energy meter designed for monitoring Sunny Boy inverter production with a 0.5% degree of accuracy.


Modbus Protocol Interface

SMA Modbus interfaces provide support for the industry standard protocol for communications between electronic devices. Modbus interfaces enable the integration of SMA products with products from other suppliers for system monitoring and control.

Modbus Protokoll-Schnittstelle

External Wlan Antenna

The external antenna extension kit increases the inverter's WLAN range to overcome site conditions which inhibit wireless signals and to ensure reliable wireless communications with the network router.

External Wlan Antenna - Quick Reference Guide
External Wlan Antenna

Sunny Boy 3.0-US / 3.8-US / 5.0-US / 6.0-US / 7.0-US / 7.7-US



Operating instructions

Now the user manual is also available as

We will be happy to advise you on your PV projects.


We will be happy to advise you on your PV projects.

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SMA ShadeFix

SMA ShadeFix

SMA ShadeFix optimization is a proprietary, integrated inverter capability that optimizes PV system energy production in every situation – even when shading occurs.

Learn more

Quick Design Reference Tool

The SMA Sunny Boy US-41 - Quick Design Reference provides string design and inverter selection recommendations based on module specifications and design criteria specified by the user.