Enphase IQ9S-3P 548VA Three-Phase Microinverter

About This Product

The Enphase IQ9S-3P 548VA Three-Phase Microinverter is a module-level solar inverter designed for commercial three-phase electrical systems using 277V line-to-neutral service. It converts DC electricity from an individual solar panel into grid-compatible AC electricity, allowing each panel to operate independently.

This domestic-content version features a US-manufactured printed circuit board assembly (PCBA), electrical components, and enclosure. It is designed to support projects pursuing the federal Investment Tax Credit (ITC) domestic content bonus, subject to applicable eligibility requirements. The microinverter includes MC4 DC bulkhead connections and is intended for professionally designed, grid-connected solar installations.

Who This Product Suits

The Enphase IQ9S-3P is suited to commercial solar installers, electrical contractors, and EPC companies designing three-phase solar systems with compatible 277V line-to-neutral electrical service.

• Commercial rooftop solar installations requiring module-level DC-to-AC conversion.
• Three-phase electrical systems where the microinverter voltage and grid configuration are compatible.
• Projects requiring individual solar panel power conversion and module-level monitoring when integrated with compatible Enphase equipment.
• Commercial developments evaluating US domestic content requirements for federal solar tax incentives.
• Installations where independent panel operation helps accommodate different roof orientations or partial shading.

Installers should confirm solar module compatibility, electrical service configuration, Enphase system requirements, and applicable NEC provisions before installation.

Specifications Explained

• Manufacturer Model: IQ9S-3P-277-B-DOM-US, identifying the three-phase, 277V domestic-content configuration.
• Peak AC Output: 548VA, representing the microinverter’s specified peak apparent power output.
• Nominal AC Voltage: 277V line-to-neutral, intended for compatible commercial three-phase electrical systems.
• Inverter Type: Module-level, grid-connected three-phase microinverter.
• DC Connection: MC4 DC bulkhead interface for compatible solar module connections.
• Domestic Content: US-manufactured PCBA, electrical parts, and enclosure, as identified in the manufacturer’s product description.
• Manufacturer Warranty: 25 years, subject to Enphase warranty terms and conditions.
• Installation Requirements: Solar module compatibility, AC branch circuit design, overcurrent protection, grounding, and rapid shutdown compliance must be verified against Enphase installation documentation and applicable NEC requirements.

Summary

The Enphase IQ9S-3P provides 548VA peak AC output for compatible 277V commercial three-phase solar installations. Its module-level conversion architecture, MC4 DC connection, domestic-content construction, and 25-year manufacturer warranty make it a practical option for commercial solar projects using Enphase microinverter technology.

For system design, installers should verify the electrical service, approved solar module combinations, required Enphase components, and project-specific domestic content eligibility before ordering.

Further Information From The Manufacturer

Enphase IQ9S-3P Microinverter, 548 VA peak power, MC4 DC Bulkhead, Three Phase. Made in USA. PCBA, Electrical Parts, and Enclosure are domestically manufactured to meet the eligibility requirements for the ITC domestic content bonus adder.

Specifications

About Enphase

Enphase is a global leader in microinverters and fully integrated solar-plus-storage ecosystems. Its U.S. product lineup includes microinverters, batteries, EV charging and advanced monitoring through the Enphase platform.

The brand is widely used in residential solar projects where module-level monitoring, flexible array design and strong installer support are priorities. Enphase systems are especially common in projects that value visibility, expandability and straightforward serviceability.