Enphase IQ8P-3P Commercial Microinverter, 208V Three-Phase – IQ8P-3P-72-E-US
SKUIQ8P-3P-72-E-US
The Enphase IQ8P-3P (IQ8P-3P-72-E-US) is a grid-tie microinverter for small commercial buildings with 120/208 VAC (4-wire) three-phase service. One unit mounts under each solar panel and converts that panel's DC power into AC power, rated 475 VA continuous at 208 V.
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Product Overview
The Enphase IQ8P-3P (IQ8P-3P-72-E-US) is a grid-tie microinverter for small commercial buildings with 120/208 VAC (4-wire) three-phase service. One unit mounts under each solar panel and converts that panel's DC power into AC power, rated 475 VA continuous at 208 V.
This is a commercial three-phase model. It is not for 240 V split-phase homes, and Enphase's datasheet says connecting to any system voltage other than 120/208 VAC three-phase requires a transformer. Monitoring requires an Enphase IQ Gateway Commercial 2, which talks to the microinverters over the AC wiring.
Enphase lists commonly used module pairings of 380–640 W, covering 54-, 60-, 66- and 72-cell modules and their half-cell versions, so it suits the higher-power panels common on commercial roofs.
Best For
- Small commercial roofs on 120/208 V three-phase (4-wire) service: Enphase designed the IQ8P-3P for this service. It is not listed for 240 V split-phase.
- High-power panels: Enphase lists 380–640 W modules (54/108-, 60/120-, 66/132- and 72/144-cell) as commonly used pairings.
- Roofs with shade or several orientations: Each panel is converted separately, so one shaded panel does not pull down the others.
Key Features & Specifications
| Specification | Details |
|---|---|
| Product type | Grid-tie commercial microinverter (one per PV module), Enphase IQ8 Commercial |
| Model / ordering SKU | IQ8P-3P-72-E-US (Enphase also makes a U.S.-made version, IQ8P-3P-72-E-DOM-US, with the same ratings) |
| Grid connection | 120/208 VAC (4-wire) three-phase; nominal 208 V L-L (range 183–229 V), or 220 V (range 198–242 V) where configured; 60 Hz |
| Peak output power | 480 VA |
| Maximum continuous output power | 475 VA |
| Maximum continuous output current | 2.28 A at 208 V; 2.16 A at 220 V |
| Maximum units per 20 A three-phase branch circuit | 12 (Enphase notes local limits may vary) |
| Module compatibility | 54-cell/108-half-cell, 60-cell/120-half-cell, 66-cell/132-half-cell and 72-cell/144-half-cell modules; commonly used pairings 380–640 W |
| Peak power tracking voltage | 35.5–53 V |
| Operating range | 16–63 V |
| Minimum / maximum start voltage | 21 V / 63 V |
| Maximum input DC voltage | 63 V |
| Maximum DC continuous current (module Imp) | 14 A |
| Maximum input DC short-circuit current / maximum module Isc | 25 A / 20 A |
| Efficiency | CEC weighted 97.5%; peak 97.8% |
| DC connector | Enphase EN4 bulkhead, supplied with an ECA-EN4-S22-12 adapter cable pair (EN4 to Stäubli MC4, 150 mm) |
| Communication; monitoring | Power line communication (PLC); requires an Enphase IQ Gateway Commercial 2 |
| Enclosure | Class II double-insulated, corrosion-resistant polymeric enclosure; NEMA Type 6/IP67, outdoor |
| Ambient temperature range | −40°C to 65°C (−40°F to 149°F) |
| Dimensions; weight | 265 × 200 × 35 mm (10.4 × 7.9 × 1.4 in) without bracket; 1.6 kg (3.5 lb) |
| Rapid shutdown | UL Listed as PV rapid shutdown equipment; Enphase states it conforms with NEC 2014, 2017 and 2020 section 690.12 when installed per Enphase instructions |
| Certifications (per Enphase) | CA Rule 21 (UL 1741-SB), UL 62109-1, UL 1741/IEEE 1547, FCC Part 15 Class B, CAN/CSA-C22.2 No. 107.1-01 |
| Warranty (per Enphase) | Enphase's IQ8P-3P datasheet (DSH-00450-2.0) ties the 25-year limited warranty to an internet-connected IQ Gateway; see Enphase's current warranty terms |
| Source | Enphase IQ8 Commercial Microinverters datasheet DSH-00236-8.0-EN-2026-06-04; IQ8P-3P datasheet DSH-00450-2.0-EN-US-2025-01-24 |
What You May Also Need
Usually required
- Enphase IQ Gateway Commercial 2: Enphase's datasheet says monitoring requires this gateway. The residential IQ Gateway is a different product.
- Enphase three-phase IQ Cable: Connects the microinverters on each three-phase branch. Choose the cable from Enphase's commercial design documents for this microinverter.
- Disconnects and breakers: Each three-phase branch needs a 20 A (maximum) breaker, and most commercial systems also need an AC disconnect.
May be required
- PV cables: Panel leads must reach the supplied EN4-to-MC4 adapter cables. Check the connector type on any extension cable you add.
- Racking that supports microinverter mounting: Each microinverter mounts to the racking under its panel.
Optional upgrades
- Spare EN4-to-MC4 adapter cables: Useful for service. Use only the Enphase adapter type listed on the datasheet.
Check current manufacturer documentation before combining components, especially batteries, inverters, communications equipment and system-control hardware.
Important Considerations
- Three-phase 208 V only. This model is for 120/208 VAC (4-wire) three-phase service. Do not use it on a 240 V split-phase home service without the transformer Enphase calls for.
- Connector rule. Enphase says the bulkhead and adapter-cable DC connectors must be mated only with the identical type and brand of connector.
- Check module voltage and current. The panel's cold-weather Voc must stay at or below 63 V, its Imp at or below 14 A and its Isc at or below 20 A. Panels above 640 W may see extra clipping losses, according to Enphase.
- Commercial monitoring setup. Plan the IQ Gateway Commercial 2 and its internet connection as part of the design; Enphase ties the full warranty term to an internet-connected gateway.
- Permits and interconnection. Commercial grid-connected systems need utility approval and are designed and installed by qualified professionals under local electrical codes.