SMA’s Sunny Boy micro inverter system enhances design flexibility for installers in the U.S. and across the globe. It features industry-leading 96% CEC efficiency, simple installation, an innovative communications platform and is especially applicable for residential systems and rooftops with complex, shaded situations. Superior reliability is achieved with the groundbreaking introduction of the Sunny Multigate-US, which allows for fewer components exposed to heat stress under the module and greatly improves communication reliability versus other micro inverter systems. An improved cabling concept further elevates the Sunny Boy 240 from the competition by eliminating the need for a trunk cable.

Optimized Reliability

  • Industry-leading 96% CEC efficiency
  • Multigate technology allows for reduced component count
  • Private band powerline for highly reliable communications
  • Overvoltage protection enhances durability


Simple Installation

  • Ideal for complex roofs
  • Pre-assembled AC plugs and connection cables
  • Multiple DC connector options and daisy chain configuration


Unrivaled Monitoring

  • The Sunny Multigate is a reliable, distortion-free solution
  • Module-level, customized reporting through Sunny Portal
  • Remote monitoring via the Internet or iPhone and Android apps


SMA-Backed Security

  • 30 year history and strong financials create stability and ensure full warranty support
  • German engineered, assembled in the USA for unmatched quality
  • #1 ranked service offering





SUNNY BOY 240-US / SUNNY MULTIGATE-US - Firmware update
Type: Firmware
Language: International
Document number: SMA_Multigate-US-10_Package_V010301R_SB240-US_V010056R
Version number: 01.03.01.R/01.00.56.R
Data sheet

SUNNY BOY 240-US - Dream big. Start small.
Type: Data sheet
Language: English (US)
Document number: SB240MGATEEXP-DUS132917
Version number: 1.7
Installation Guide

SUNNY BOY 240-US / SUNNY MULTIGATE-US - Installation Manual
Type: Installation Guide
Language: English (US)
Document number: SMG-SB240US-IA-en-13
Version number: 1.3

SUNNY BOY 240-US - Mounting overview / Resumen de montaje / Vue d’ensemble de montage
Type: Installation Guide
Language: International
Document number: SB240US-Plan-IA-en-es-fr-10
Version number: 1.0

Production Test Report - According to UL1741 Second Edition, January 28, 2010, IEEE 1547 (2003) and IEEE 1547.1 (2005)
Type: Certificate
Language: English (US)
Document number: SBUS-ZE-PTR-en-14
Version number: 1.4

Certificate of Compliance - SUNNY BOY 240-US
Type: Certificate
Language: English (US)
Document number: COCUL_SB240US-ZE-en-us-10
Version number: 1.0

Buy American Act of 1933 - Qualification Letter
Type: Certificate
Language: English (US)
Document number: BAA Qualification Letter 02042014
Version number: 1.4

ORDER FORM - SMA WARRANTY EXTENSION - Warranty Extensions for SMA America Sunny Boy Products
Type: Warranty
Language: English (US)
Document number: US_SO107-0078-001_r04
Version number: 4.0

SMA America LLC Factory Warranty - Sunny Boy, Sunny Island, Sunny Tripower, SMA Fuel Save Controller, Monitoring Systems
Type: Warranty
Language: English (US)
Document number: SBSMC_SIWB-ZE-GEBED-US_en-34
Version number: 3.4