Enphase IQ8MC Microinverter 330W Three-Phase
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Enphase IQ8MC Microinverter 330W Three-Phase

Enphase IQ8MC Microinverter 330W Three-Phase

$61.38

Original: $175.37

-65%
Enphase IQ8MC Microinverter 330W Three-Phase—

$175.37

$61.38

The Story

The Enphase IQ8MC Microinverter (Three-Phase Installation) (model IQ8MC-72-M-INT) is the IQ8MC deployed in a three-phase IQ Cable system for balanced generation across 230/400 V three-phase supplies. Each microinverter outputs a single phase at 230 V L-N — distributed evenly across L1, L2, and L3 via the three-phase IQ Cable, which automatically balances phase loading without any manual phase assignment during installation. Rated at 330 W maximum AC output per unit with a 97.5% peak efficiency (96.7% EU weighted), and accepting 54-cell to 72-cell modules (108 to 144 half-cell), the IQ8MC is the most widely compatible model in the IQ8 range. Its 25 V minimum MPP voltage — the lowest in the IQ8 72-cell family — makes it the safest choice for modules with lower Vmp at cold UK operating temperatures. The three-phase configuration supports up to 33 microinverters per three-phase 20A circuit (11 per phase), allowing commercial arrays of over 10 kW AC per circuit. CE marked, certified to G98, G99, and G100, backed by a 25-year limited warranty with connected IQ Gateway. Source: UK datasheet DSH-00198-5.0, March 2026.

330 W
Max AC Per Unit
33 Units
Per 3-Phase 20A Circuit
97.5%
Peak Efficiency
IP67
Enclosure Rating
25 Years
Limited Warranty
⚠ Installer Requirements: Three-phase installations require the three-phase IQ Cable (Q-25-xx-3P variants) — not the single-phase Q Cable. Three-phase field wireable connectors (Q-CONN-3P-10M / Q-CONN-3P-10F) are required where custom cable lengths are needed. G99 notification is required for systems above the G98 threshold — with 11 IQ8MC units per phase at 1.43 A equalling 15.73 A per phase, most full three-phase circuit installations will require G99. Confirm with the DNO. A connected IQ Gateway is required for the 25-year warranty and for advanced grid functions.
⚠ Phase Balance: Each IQ8MC unit outputs single-phase 230 V L-N only. Three-phase balance is achieved by the three-phase IQ Cable distributing units sequentially across L1, L2, and L3 — not by the microinverter itself. Total units across the three phases must be managed to remain within DNO phase imbalance limits. The IQ Gateway's Phase Imbalance Management (PIM) function provides ongoing monitoring.
ℹ Highest Circuit Capacity in the IQ8 72-Cell Range: At 1.43 A per unit, the IQ8MC allows 33 microinverters per three-phase 20A circuit — more than the IQ8AC (30 units) or IQ8HC (27 units). For commercial projects where maximising the number of panels per circuit is a priority — particularly where roof sections are separated and minimising cable runs matters — the IQ8MC's lower per-unit current is a practical advantage.
33 Units Per Three-Phase Circuit

The IQ8MC's 1.43 A per-unit output current means 11 units per phase stay within the 16 A per phase limit of a 20A circuit (using the IEC 60364 ×1.25 safety factor), giving 33 units total per three-phase 20A circuit. This translates to up to 10.89 kW AC per circuit — and with multiple circuits per IQ Gateway, commercial arrays of 30–50 kW are achievable on a single gateway without requiring additional communications hardware.

Widest Module MPP Window in the IQ8 Range

The IQ8MC's 25 V minimum MPP voltage is the lowest in the IQ8MC/AC/HC family, giving the widest operating margin for modules with lower Vmp. At the cold end of the UK temperature range, module Vmp rises — but at the high-irradiance, high-temperature end of summer, Vmp can dip. The 25 V floor provides the most headroom against this dip, making the IQ8MC a safer default choice for projects where exact module Vmp at temperature has not been calculated.

Automatic Three-Phase Balancing

The three-phase IQ Cable contains four conductors (L1, L2, L3, Neutral) and assigns each microinverter connector drop to the next phase in sequence — so every third connector is on the same phase. This means the installer simply plugs microinverters in without tracking phase assignments, and the array is automatically balanced from panel one. The IQ Gateway's PIM function monitors and reports on phase balance after commissioning.

Shade Tolerance on Complex Commercial Roofs

Commercial rooftops routinely involve plant rooms, roof lights, parapets, and adjacent building obstructions that create partial shade on different panels at different times of day. Because each IQ8MC operates at its own individual MPPT, a shading event affecting one panel has zero impact on the output of its neighbours. This makes microinverters consistently superior to string inverters with or without power optimisers on shade-affected commercial roofs.

G100 Power Export Limiting — DNO Compliant

Many commercial three-phase G99 connections are granted with a maximum export limit condition. The IQ8MC supports Power Export Limiting (PEL) as a standard advanced grid function, configured via the IQ Gateway Metered with correctly installed CT clamps. This allows the system to self-curtail to the DNO-approved export ceiling automatically — making G99 compliance manageable without separate external equipment.

97.5% Peak Efficiency — Highest in the IQ8 72-Cell Family

The IQ8MC achieves a 97.5% peak efficiency — the highest of any model in the IQ8MC/AC/HC datasheet at peak power. While the IQ8HC leads on EU weighted efficiency (96.8% vs 96.7%), the IQ8MC's peak efficiency advantage is relevant at higher irradiance — significant for south-facing commercial arrays in the UK's sunnier months. Both figures are measured at STC within the MPP range per EN 50524.

Technical Specifications — IQ8MC-72-M-INT (Three-Phase Application, UK Datasheet DSH-00198-5.0, March 2026)
DC Input
Typical module compatibility 54-cell/108 HC, 60-cell/120 HC, 66-cell/132 HC, 72-cell/144 HC
Min/Max input voltage 18 V / 60 V
Startup input voltage 22 V
Rated input voltage 35.0 V
Min/Max MPP voltage 25 V / 45 V
Max input current (Idcmax) 14 A
Max short-circuit input current (Iscmax) 25 A (max module Isc: 20 A, per IEC 62548 ×1.25)
Max input power (Pdcmax) 480 W
DC connector Stäubli MC4 (integrated)
AC Output — Three-Phase Application
Max AC output power (per unit) 330 W at 230 V L-N
Max apparent power (per unit) 325 VA
Rated power (per unit) 325 W
Three-phase supply voltage 230/400 V (each unit outputs 230 V L-N, one phase)
Nominal grid voltage range 184–276 V
Max output current (per unit) 1.43 A
Max units per three-phase 20A circuit 33 (3L+N) = 11 per phase
Max units per three-phase IQ Cable section 18 (3L+N) = 6 per phase
Nominal frequency 50 Hz (range: 45–55 Hz)
Power factor (adjustable) 0.8 leading … 0.8 lagging
Total harmonic distortion <5%
Peak efficiency 97.5%
EU weighted efficiency 96.7%
Topology Isolated HF transformer
Night-time power loss 50 mW
Mechanical & Environmental
Dimensions (H × W × D) 212 mm × 175 mm × 30.2 mm (excl. mounting brackets)
Weight (with mounting plate) 1.1 kg
Ambient temperature range -40°C to +65°C
Relative humidity 4–100% (condensing)
Cooling Natural convection — no fans
Enclosure Class II double-insulated, corrosion-resistant polymer
IP rating Outdoor — IP67
Max altitude <2,600 m
AC connector Enphase three-phase IQ Cable (Q-25-xx-3P variants)
Standards & Compliance
Grid compliance G98, G99, G100
Safety EN IEC 62109-1, EN IEC 62109-2
EMC EN IEC 61000-3-2/-3-3/-6-2/-6-3, EN IEC 50065-1/-2-2, EN 55011
Product labelling CE
Advanced grid functions Power Export Limiting (PEL / G100), Phase Imbalance Management (PIM), Loss of Phase Detection (LOP), power factor control Q(U) / cos φ(P)
Limited warranty Up to 25 years (requires connected IQ Gateway)
Communication PLC 110–120 kHz (Class B), narrowband 200 Hz
Do IQ8MC microinverters themselves output three-phase power?
No. Each IQ8MC unit outputs single-phase 230 V L-N. The three-phase system is achieved by the three-phase IQ Cable, which distributes microinverter connector drops sequentially across L1, L2, and L3. Every third drop on the cable is on the same phase, so as long as units are installed in sequence, phase balance is automatic. The IQ Gateway's Phase Imbalance Management (PIM) function monitors balance after commissioning.
Why choose the IQ8MC over IQ8AC or IQ8HC for a three-phase installation?
Three reasons. First, circuit capacity: the IQ8MC allows 33 units per three-phase 20A circuit (11 per phase) vs 30 for IQ8AC and 27 for IQ8HC — useful for large commercial rooftops where maximising panels per circuit reduces wiring and combiner cost. Second, module compatibility: its 25 V minimum MPP voltage gives the widest margin for panels with lower Vmp. Third, peak efficiency: 97.5% is the highest in the IQ8 72-cell family. The IQ8AC or IQ8HC is better if you specifically need higher per-panel AC output (366 W or 384 W) and your module's Vmp is comfortably above 28 V.
What three-phase IQ Cable variants do I need?
You need the three-phase IQ Cable (Q-25-xx-3P variants) — a four-conductor cable (L1, L2, L3, Neutral) with three-phase connector drops. Common UK variants include Q-25-17-3P-160 (1.7 m pitch for landscape orientation) and Q-25-10-3P-200 (1.0 m pitch for portrait). For custom homerun cable lengths, use three-phase field wireable connectors (Q-CONN-3P-10M and Q-CONN-3P-10F). A Q-DISC-3P-10 disconnect tool is required for servicing.
Is G99 notification required for a full three-phase IQ8MC circuit?
At 11 units per phase × 1.43 A = 15.73 A per phase — just under the 16 A G98 single-phase threshold. However, G99 applies where the total export to the distribution network at a single connection point requires it, and most DNOs require G99 for three-phase commercial installations of this scale regardless of per-phase current. Always confirm with the DNO before connection, and allow for the G99 approval timeline in project planning.
How does Power Export Limiting work with the IQ8MC on a three-phase G99 installation?
Power Export Limiting (PEL) requires an IQ Gateway Metered (ENV-S-EM-230) with one CT clamp per phase correctly installed and oriented on the incoming supply tails. The IQ Gateway measures real-time export on each phase and instructs the microinverters (via PLC) to reduce output when the export limit is approached. The limit value is set as part of the G100 grid profile applied during commissioning via the Enphase Installer Platform.
Can IQ8MC and IQ8AC units be mixed on the same three-phase installation?
Yes — different IQ8 models can coexist on the same IQ Gateway and even on the same IQ Cable branch, though it is generally simpler to keep branch circuits consistent. When mixing models, circuit sizing must be calculated on the highest-output model present in the branch. Phase balance calculations must account for different output currents if models are distributed unevenly across phases.
Enphase IQ8MC Microinverter 330W Three-Phase - Image 2

Details & Craftsmanship

Every detail has been carefully considered to bring you the perfect product.

Enphase IQ8MC Microinverter 330W Three-Phase - Image 3

Details & Craftsmanship

Every detail has been carefully considered to bring you the perfect product.

Enphase IQ8MC Microinverter 330W Three-Phase - Image 4

Details & Craftsmanship

Every detail has been carefully considered to bring you the perfect product.

Description

The Enphase IQ8MC Microinverter (Three-Phase Installation) (model IQ8MC-72-M-INT) is the IQ8MC deployed in a three-phase IQ Cable system for balanced generation across 230/400 V three-phase supplies. Each microinverter outputs a single phase at 230 V L-N — distributed evenly across L1, L2, and L3 via the three-phase IQ Cable, which automatically balances phase loading without any manual phase assignment during installation. Rated at 330 W maximum AC output per unit with a 97.5% peak efficiency (96.7% EU weighted), and accepting 54-cell to 72-cell modules (108 to 144 half-cell), the IQ8MC is the most widely compatible model in the IQ8 range. Its 25 V minimum MPP voltage — the lowest in the IQ8 72-cell family — makes it the safest choice for modules with lower Vmp at cold UK operating temperatures. The three-phase configuration supports up to 33 microinverters per three-phase 20A circuit (11 per phase), allowing commercial arrays of over 10 kW AC per circuit. CE marked, certified to G98, G99, and G100, backed by a 25-year limited warranty with connected IQ Gateway. Source: UK datasheet DSH-00198-5.0, March 2026.

330 W
Max AC Per Unit
33 Units
Per 3-Phase 20A Circuit
97.5%
Peak Efficiency
IP67
Enclosure Rating
25 Years
Limited Warranty
⚠ Installer Requirements: Three-phase installations require the three-phase IQ Cable (Q-25-xx-3P variants) — not the single-phase Q Cable. Three-phase field wireable connectors (Q-CONN-3P-10M / Q-CONN-3P-10F) are required where custom cable lengths are needed. G99 notification is required for systems above the G98 threshold — with 11 IQ8MC units per phase at 1.43 A equalling 15.73 A per phase, most full three-phase circuit installations will require G99. Confirm with the DNO. A connected IQ Gateway is required for the 25-year warranty and for advanced grid functions.
⚠ Phase Balance: Each IQ8MC unit outputs single-phase 230 V L-N only. Three-phase balance is achieved by the three-phase IQ Cable distributing units sequentially across L1, L2, and L3 — not by the microinverter itself. Total units across the three phases must be managed to remain within DNO phase imbalance limits. The IQ Gateway's Phase Imbalance Management (PIM) function provides ongoing monitoring.
ℹ Highest Circuit Capacity in the IQ8 72-Cell Range: At 1.43 A per unit, the IQ8MC allows 33 microinverters per three-phase 20A circuit — more than the IQ8AC (30 units) or IQ8HC (27 units). For commercial projects where maximising the number of panels per circuit is a priority — particularly where roof sections are separated and minimising cable runs matters — the IQ8MC's lower per-unit current is a practical advantage.
33 Units Per Three-Phase Circuit

The IQ8MC's 1.43 A per-unit output current means 11 units per phase stay within the 16 A per phase limit of a 20A circuit (using the IEC 60364 ×1.25 safety factor), giving 33 units total per three-phase 20A circuit. This translates to up to 10.89 kW AC per circuit — and with multiple circuits per IQ Gateway, commercial arrays of 30–50 kW are achievable on a single gateway without requiring additional communications hardware.

Widest Module MPP Window in the IQ8 Range

The IQ8MC's 25 V minimum MPP voltage is the lowest in the IQ8MC/AC/HC family, giving the widest operating margin for modules with lower Vmp. At the cold end of the UK temperature range, module Vmp rises — but at the high-irradiance, high-temperature end of summer, Vmp can dip. The 25 V floor provides the most headroom against this dip, making the IQ8MC a safer default choice for projects where exact module Vmp at temperature has not been calculated.

Automatic Three-Phase Balancing

The three-phase IQ Cable contains four conductors (L1, L2, L3, Neutral) and assigns each microinverter connector drop to the next phase in sequence — so every third connector is on the same phase. This means the installer simply plugs microinverters in without tracking phase assignments, and the array is automatically balanced from panel one. The IQ Gateway's PIM function monitors and reports on phase balance after commissioning.

Shade Tolerance on Complex Commercial Roofs

Commercial rooftops routinely involve plant rooms, roof lights, parapets, and adjacent building obstructions that create partial shade on different panels at different times of day. Because each IQ8MC operates at its own individual MPPT, a shading event affecting one panel has zero impact on the output of its neighbours. This makes microinverters consistently superior to string inverters with or without power optimisers on shade-affected commercial roofs.

G100 Power Export Limiting — DNO Compliant

Many commercial three-phase G99 connections are granted with a maximum export limit condition. The IQ8MC supports Power Export Limiting (PEL) as a standard advanced grid function, configured via the IQ Gateway Metered with correctly installed CT clamps. This allows the system to self-curtail to the DNO-approved export ceiling automatically — making G99 compliance manageable without separate external equipment.

97.5% Peak Efficiency — Highest in the IQ8 72-Cell Family

The IQ8MC achieves a 97.5% peak efficiency — the highest of any model in the IQ8MC/AC/HC datasheet at peak power. While the IQ8HC leads on EU weighted efficiency (96.8% vs 96.7%), the IQ8MC's peak efficiency advantage is relevant at higher irradiance — significant for south-facing commercial arrays in the UK's sunnier months. Both figures are measured at STC within the MPP range per EN 50524.

Technical Specifications — IQ8MC-72-M-INT (Three-Phase Application, UK Datasheet DSH-00198-5.0, March 2026)
DC Input
Typical module compatibility 54-cell/108 HC, 60-cell/120 HC, 66-cell/132 HC, 72-cell/144 HC
Min/Max input voltage 18 V / 60 V
Startup input voltage 22 V
Rated input voltage 35.0 V
Min/Max MPP voltage 25 V / 45 V
Max input current (Idcmax) 14 A
Max short-circuit input current (Iscmax) 25 A (max module Isc: 20 A, per IEC 62548 ×1.25)
Max input power (Pdcmax) 480 W
DC connector Stäubli MC4 (integrated)
AC Output — Three-Phase Application
Max AC output power (per unit) 330 W at 230 V L-N
Max apparent power (per unit) 325 VA
Rated power (per unit) 325 W
Three-phase supply voltage 230/400 V (each unit outputs 230 V L-N, one phase)
Nominal grid voltage range 184–276 V
Max output current (per unit) 1.43 A
Max units per three-phase 20A circuit 33 (3L+N) = 11 per phase
Max units per three-phase IQ Cable section 18 (3L+N) = 6 per phase
Nominal frequency 50 Hz (range: 45–55 Hz)
Power factor (adjustable) 0.8 leading … 0.8 lagging
Total harmonic distortion <5%
Peak efficiency 97.5%
EU weighted efficiency 96.7%
Topology Isolated HF transformer
Night-time power loss 50 mW
Mechanical & Environmental
Dimensions (H × W × D) 212 mm × 175 mm × 30.2 mm (excl. mounting brackets)
Weight (with mounting plate) 1.1 kg
Ambient temperature range -40°C to +65°C
Relative humidity 4–100% (condensing)
Cooling Natural convection — no fans
Enclosure Class II double-insulated, corrosion-resistant polymer
IP rating Outdoor — IP67
Max altitude <2,600 m
AC connector Enphase three-phase IQ Cable (Q-25-xx-3P variants)
Standards & Compliance
Grid compliance G98, G99, G100
Safety EN IEC 62109-1, EN IEC 62109-2
EMC EN IEC 61000-3-2/-3-3/-6-2/-6-3, EN IEC 50065-1/-2-2, EN 55011
Product labelling CE
Advanced grid functions Power Export Limiting (PEL / G100), Phase Imbalance Management (PIM), Loss of Phase Detection (LOP), power factor control Q(U) / cos φ(P)
Limited warranty Up to 25 years (requires connected IQ Gateway)
Communication PLC 110–120 kHz (Class B), narrowband 200 Hz
Do IQ8MC microinverters themselves output three-phase power?
No. Each IQ8MC unit outputs single-phase 230 V L-N. The three-phase system is achieved by the three-phase IQ Cable, which distributes microinverter connector drops sequentially across L1, L2, and L3. Every third drop on the cable is on the same phase, so as long as units are installed in sequence, phase balance is automatic. The IQ Gateway's Phase Imbalance Management (PIM) function monitors balance after commissioning.
Why choose the IQ8MC over IQ8AC or IQ8HC for a three-phase installation?
Three reasons. First, circuit capacity: the IQ8MC allows 33 units per three-phase 20A circuit (11 per phase) vs 30 for IQ8AC and 27 for IQ8HC — useful for large commercial rooftops where maximising panels per circuit reduces wiring and combiner cost. Second, module compatibility: its 25 V minimum MPP voltage gives the widest margin for panels with lower Vmp. Third, peak efficiency: 97.5% is the highest in the IQ8 72-cell family. The IQ8AC or IQ8HC is better if you specifically need higher per-panel AC output (366 W or 384 W) and your module's Vmp is comfortably above 28 V.
What three-phase IQ Cable variants do I need?
You need the three-phase IQ Cable (Q-25-xx-3P variants) — a four-conductor cable (L1, L2, L3, Neutral) with three-phase connector drops. Common UK variants include Q-25-17-3P-160 (1.7 m pitch for landscape orientation) and Q-25-10-3P-200 (1.0 m pitch for portrait). For custom homerun cable lengths, use three-phase field wireable connectors (Q-CONN-3P-10M and Q-CONN-3P-10F). A Q-DISC-3P-10 disconnect tool is required for servicing.
Is G99 notification required for a full three-phase IQ8MC circuit?
At 11 units per phase × 1.43 A = 15.73 A per phase — just under the 16 A G98 single-phase threshold. However, G99 applies where the total export to the distribution network at a single connection point requires it, and most DNOs require G99 for three-phase commercial installations of this scale regardless of per-phase current. Always confirm with the DNO before connection, and allow for the G99 approval timeline in project planning.
How does Power Export Limiting work with the IQ8MC on a three-phase G99 installation?
Power Export Limiting (PEL) requires an IQ Gateway Metered (ENV-S-EM-230) with one CT clamp per phase correctly installed and oriented on the incoming supply tails. The IQ Gateway measures real-time export on each phase and instructs the microinverters (via PLC) to reduce output when the export limit is approached. The limit value is set as part of the G100 grid profile applied during commissioning via the Enphase Installer Platform.
Can IQ8MC and IQ8AC units be mixed on the same three-phase installation?
Yes — different IQ8 models can coexist on the same IQ Gateway and even on the same IQ Cable branch, though it is generally simpler to keep branch circuits consistent. When mixing models, circuit sizing must be calculated on the highest-output model present in the branch. Phase balance calculations must account for different output currents if models are distributed unevenly across phases.
Enphase IQ8MC Microinverter 330W Three-Phase | AIZO Quality Heating