Enphase IQ8HC Microinverter 384W Domestic Content 240/208V Grid-Forming Inverter EN-IQ8HC-72-M-DOM-US

The Enphase IQ8HC Microinverter (EN-IQ8HC-72-M-DOM-US) is a 384 VA peak output Enphase IQ8 microinverter optimized for 72-cell and 144-half-cell PV modules in the 320–540W range, operating within a 29.5–45V MPPT range and a 60V maximum DC input. As the DOM-US variant, its PCBA, electrical parts, and enclosure are manufactured in the United States, making it eligible for consideration under the IRS domestic content provisions for the ITC Domestic Content Bonus Credit. It shares the same microgrid-forming ASIC architecture as all IQ8 Series microinverters, supporting both grid-tied and backup-capable off-grid operation when paired with an IQ System Controller 2 or 3.

Note: The IQ8HC-72-M-DOM-US SKU is currently undergoing compliance testing; specifications are preliminary and subject to change. Domestic content eligibility for the ITC bonus adder is determined by IRS provisions — consult a qualified tax professional to confirm applicability to your specific project before purchasing on this basis.

Key specifications

• Peak output power: 384 VA @ 240 VAC / 366 VA @ 208 VAC; max. continuous output: 380 VA @ 240 VAC / 360 VA @ 208 VAC
• Compatible module power range: 320–540W (72-cell / 144-half-cell formats)
• AC output voltage: 240V split-phase (L-L) or 208V single-phase (L-L), 60 Hz
• Peak efficiency: 97.3% @ 240 VAC; CEC weighted efficiency: 97.0%
• MPPT voltage range: 29.5–45V; operating range: 18–58V; max. input DC voltage: 60V
• Max. continuous operating DC current: 14A; max. module Isc: 20A
• Max. continuous output current: 1.58A @ 240 VAC / 1.73A @ 208 VAC
• Max. units per 20A (L-L) branch circuit: 10 @ 240 VAC / 9 @ 208 VAC
• DC connector: Stäubli MC4 (integrated)
• Dimensions (H × W × D): 8.3 × 6.9 × 1.2 in. (212 × 175 × 30.2 mm); 2.43 lbs. (1.1 kg)
• Environmental rating: NEMA Type 6; approved for wet locations; PD3; operating range -40°F to 149°F (-40°C to 65°C)
• Rapid shutdown: UL Listed as PV Rapid Shutdown Equipment; NEC 2014, NEC 2017, NEC 2020, and NEC 2023 §690.12 compliant
• Certifications: CA Rule 21 (UL 1741-SA), IEEE 1547:2018 (UL 1741-SB), UL 62109-1, FCC Part 15 Class B, CAN/CSA-C22.2 No. 107.1-01
• Warranty: 25-year limited

IQ8HC vs. IQ8X: choosing the right variant

The IQ8HC and IQ8X deliver the same 384 VA peak output and 97.3% peak efficiency, but they serve different module voltage profiles. The IQ8HC's MPPT range of 29.5–45V and 60V maximum DC input is matched to standard 72-cell and 144-half-cell modules whose cold-temperature open-circuit voltages stay within that ceiling — the majority of current-generation residential panels in the 320–540W class. The IQ8X, by contrast, has a 43–60V MPPT range and a 79.5V maximum DC input, designed for higher-Voc 80-half-cut, 88-half-cut, and 96-cell formats. For most residential installations using conventional high-power 72-cell panels, the IQ8HC is the correct and more widely compatible choice. Module Voc should always be verified against the 60V maximum using Enphase's compatibility calculator before specifying either unit.

ITC domestic content bonus adder eligibility

The DOM-US variant is manufactured in the United States — PCBA, electrical components, and enclosure — specifically to meet the domestic content eligibility requirements for the ITC Domestic Content Bonus Credit under IRS provisions. For residential and commercial solar projects that qualify, this bonus adder can increase the base Investment Tax Credit percentage when a defined threshold of domestically manufactured components is used. The IQ8HC-72-M-DOM-US is offered through A1 SolarStore as a direct path to meeting the inverter component of that threshold, though project-level qualification depends on the full bill of materials and should be confirmed with a tax professional.

Microgrid-forming and backup capability

The IQ8HC runs on Enphase's proprietary 55-nm ASIC, enabling microgrid-forming operation — the ability to generate and deliver power independently of the utility grid during an outage. This is active when paired with an IQ System Controller 2 or 3; without it, the unit operates in standard grid-tied mode. Remote firmware updates delivered via the IQ Gateway keep the unit current with evolving utility grid profiles automatically, covering CA Rule 21 (UL 1741-SA) and IEEE 1547:2018 (UL 1741-SB) — including the requirements enforced by California utilities and other advanced grid support jurisdictions. IQ Microinverters ship with IEEE 1547 default settings pre-loaded; region-specific adjustments requested by an AHJ or utility require an IQ Gateway to implement at commissioning.

Installation and branch wiring

Integrated Stäubli MC4 connectors allow direct plug-and-play attachment to compatible PV modules without separate DC wiring harnesses. Two-wire AC cabling and power line communication (PLC) between units reduce rooftop labor versus string-inverter home-run configurations. Up to 10 IQ8HC units fit on a single 20A (L-L) branch circuit at 240 VAC, or 9 at 208 VAC. No additional DC-side protection is required; AC-side protection requires a maximum of 20A per branch circuit. The natural-convection cooling design — no fans, no moving parts — and Class II double-insulated NEMA Type 6 enclosure are rated for full outdoor exposure from -40°F to 149°F (-40°C to 65°C).

Enphase system compatibility

The IQ8HC integrates with the IQ Gateway, IQ Battery, and the Enphase App for per-module production monitoring and remote diagnostics. IQ8 Series microinverters cannot be mixed in the same system with prior generations such as IQ7 or IQ6. Module compatibility for specific panels can be verified at enphase.com's installer calculator. The IQ8HC supports both 240V split-phase and 208V single-phase installations, making it suitable for standard North American residential service as well as some light commercial configurations.

Why choose the Enphase IQ8HC Microinverter DOM-US?

The Enphase IQ8HC Microinverter DOM-US is the correct IQ8-series choice for buyers who want the 384 VA output class with US-manufactured construction for ITC domestic content bonus adder eligibility, paired with modules whose Voc stays within the 60V DC input ceiling — the case for the majority of conventional 72-cell residential panels. Its 97.3% peak efficiency, 97.0% CEC weighted efficiency, CA Rule 21 compliance, NEC 2023 Rapid Shutdown listing, and 25-year warranty apply equally to the DOM-US SKU. Available through A1 SolarStore for projects where module compatibility, domestic content, and California grid compliance are all part of the system specification.