Enphase IQ9N-3P-277-A-DOM-US Domestic Content Microinverter

The Enphase IQ9N-3P-277-A-DOM-US is a 427 VA Enphase commercial microinverter designed for 480 VAC WYE three-phase commercial PV systems, combining the highest output in the IQ9 Series with USA domestic manufacturing that supports ITC domestic content bonus adder eligibility. Built around a Class II double-insulated enclosure and Stäubli MC4 DC connectors, this unit delivers module-level power conversion at 97.5% CEC weighted efficiency across a broad compatible module range of 340–600W — covering today's large-format commercial panels without derating.

Note: This is a preliminary product. Specifications are subject to change without notice, and certifications — including CA Rule 21 (UL 1741-SA) and IEEE 1547 (UL 1741-SB) — are pending. Consult your tax advisor to confirm applicability for your specific project.

Note: The IQ9N-3P-277-A-DOM-US generates a single-phase AC output per unit. A three-phase 480 VAC WYE configuration is achieved by grouping units across phases using a three-phase QD cable — it is not a native three-phase output device. For 208 VAC / 220 VAC DELTA three-phase systems, the IQ9N-3P-208-A-DOM-US is the correct SKU.

Key specifications

• Peak and maximum continuous output power: 427 VA @ 277 V (L-N), 480 VAC WYE three-phase; up to 30 units per 20 A 480 V WYE three-phase branch circuit
• CEC weighted efficiency: 97.5%; total harmonic distortion <5%; power factor 1.0 (adjustable 0.85 leading … 0.85 lagging)
• Compatible module power range: 340–600W; MPPT voltage 28–45 V; operating voltage 16–60 V; max. startup 60 V; max. module Isc 20 A
• DC input / AC output connectors: Stäubli MC4 (DC); Enphase QD 4-pin connector (AC); dimensions 8.12 × 7.32 × 1.23 in. (206.48 × 186.03 × 31.25 mm); 2.65 lbs. (1.2 kg)
• Certifications & warranty: UL 1741/IEEE 1547, UL 62109-1, FCC Part 15 Class B, NEC 2014–2023 PV rapid shutdown listed; CA Rule 21 (UL 1741-SB) and IEEE 1547 (UL 1741-SB) pending; 25-year limited warranty

Domestic content and ITC eligibility

The IQ9N-3P-277-A-DOM-US is manufactured in the United States, with the PCBA, electrical components, and enclosure all domestically produced. This positions the unit for consideration under the ITC domestic content bonus adder available through the Inflation Reduction Act — a meaningful cost-of-ownership factor on commercial projects where federal incentive optimization directly affects project economics. For developers, EPCs, and C&I project owners evaluating where Enphase inverters are made, this SKU provides a clear domestic manufacturing answer that standard imported microinverters cannot match. Verify eligibility with your tax advisor and confirm current compliance status before specifying.

Where it fits

• Commercial rooftop and carport installations: Rated for 480 VAC WYE three-phase systems — the standard configuration for most U.S. commercial utility interconnections — with up to 30 units per 20 A branch circuit, minimizing wiring runs on large arrays.
• ITC-sensitive C&I projects: Domestic content manufacturing profile supports bonus adder eligibility for commercial solar installations seeking to maximize federal tax credit value.
• High-wattage module deployments: Compatible up to 600W, covering bifacial and large-format commercial panels increasingly common in ground-mount and rooftop commercial builds.
• New Enphase commercial system builds: Integrates with the IQ Gateway Commercial Pro (GW0-1CL-1N-D0-0R) and the Enphase App for module-level monitoring, remote diagnostics, and grid profile management.

Advanced features

• Remote automatic firmware updates keep grid profile configurations current without site visits, and the unit is configurable for a wide range of grid profiles including CA Rule 21 and IEEE 1547.
• Power line communication (PLC) over the AC wiring eliminates separate data cabling across the array, reducing installation complexity on large commercial rooftops.
• NEMA Type 6 enclosure with natural convection cooling — no fans, no moving parts — is rated for wet outdoor locations from -40°F to 149°F (-40°C to 65°C) and altitudes up to 9,842 ft (3,000 m).

System compatibility

The IQ9N-3P-277-A-DOM-US connects to PV modules via integrated Stäubli MC4 DC connectors and to the AC branch circuit via the Enphase QD 4-pin connector. Three-phase 480 VAC WYE output is achieved by distributing individual units across phases using a three-phase QD cable — not included and sold separately. Gateway compatibility is limited to the IQ Gateway Commercial Pro (GW0-1CL-1N-D0-0R); the IQ Gateway Commercial 2 is not supported at 277 V (L-N). Module compatibility can be verified at the Enphase microinverter compatibility calculator at enphase.com. This unit is designed for 480 VAC WYE systems only — for 208 VAC or 220 VAC DELTA three-phase systems, the IQ9N-3P-208-A-DOM-US is the appropriate variant.

Why choose the Enphase IQ9N-3P-277-A-DOM-US?

The IQ9N-3P-277-A-DOM-US delivers the IQ9 Series' 427 VA output ceiling in the only commercially available Enphase microinverter configuration purpose-built for 480 VAC WYE three-phase systems with domestic manufacturing credentials. At 97.5% CEC weighted efficiency, 30 units per branch circuit, and a 600W module ceiling, it is sized for the realities of modern commercial PV design — where panel wattages are rising and project economics increasingly depend on ITC incentive optimization. A1 SolarStore offers this unit for C&I developers and installers who need both performance and domestic content provenance in a single SKU.