Enphase IQ9N Microinverter with Integrated MC4 Connectors – 427 VA Smart Grid-Ready

The Enphase IQ9N Microinverter (model IQ9N-A-INT) is Enphase's ninth-generation, high-powered module-level power electronics (MLPE) device engineered for the latest generation of high-output PV modules. Delivering 427 VA maximum apparent power at 97.44% European weighted efficiency, the IQ9N operates on low-voltage DC (18–60 V), making the roof inherently safer from the moment installation begins. Each unit communicates over power-line communication (PLC) back to the IQ Gateway for real-time monitoring and remote firmware updates, and it ships with integrated Stäubli MC4 DC connectors for a tool-free panel connection. Fully compliant with G98, G99 and G100 grid connection standards, the IQ9N is designed to grow with your system — it is backward-compatible with existing IQ7 and IQ8 installations and carries an industry-leading warranty of up to 25 years when paired with an internet-connected IQ Gateway. 427 VA Max Apparent Power 97.44% EU Weighted Efficiency 600 W Max DC Input Power IP67 Outdoor Ingress Rating 25 Yrs Warranty (with IQ Gateway) G98/G99 Grid Compliance ⚠ Installer Requirements The IQ9N Microinverter must be installed by a competent, suitably qualified electrical installer in accordance with BS 7671 (IET Wiring Regulations) and all applicable local Building Regulations. Grid connection requires notification to the Distribution Network Operator (DNO) under G98 (installations up to 3.68 kW per phase) or G99 (larger installations requiring prior approval). All AC wiring must use Enphase IQ Cabling — third-party AC connectors are not approved. For systems incorporating battery backup, Enphase University certification may be required before commissioning. ⚠ Compatibility Advisory The IQ9N can be added to an existing IQ7 or IQ8 system on the same IQ Gateway, but IQ7 or IQ8 units cannot be retrofitted to a site already running IQ9N as the primary generation. In a mixed IQ7/IQ8/IQ9N array, the Sunlight Jump Start feature is not available; however, a mixed IQ8 + IQ9N system retains Sunlight Jump Start. The combined peak output of all microinverters must not exceed 150% of the IQ Battery array's rated power (200% for IQ8 + IQ9N mixed systems) when operating with battery backup. Module pairing must be verified using the Enphase Compatibility Calculator at enphase.com — the IQ9N has no enforced DC/AC ratio but the panel's open-circuit voltage and Isc must remain within inverter limits. ⓘ Why Microinverters? Unlike a string inverter, where one shaded or underperforming panel reduces the output of the entire array, each IQ9N operates independently — so every module delivers its individual maximum power. This module-level power electronics (MLPE) approach also means the DC voltage on the roof never exceeds 60 V, dramatically reducing fire risk compared to string systems running at 400–1000 V DC. The IQ9N further eliminates the need for a separate rapid shutdown device: rapid shutdown is built in, complying with the highest current safety standards. High-Power Output for Next-Gen Panels With a maximum input power of 600 W and a wide DC input range of 18–60 V, the IQ9N is engineered specifically to match today's large-format, high-output PV modules including 66-cell, 72-cell and half-cut designs. There is no enforced DC/AC ratio, giving installers flexibility to pair a wide range of current panel wattages without clipping penalties, subject to compatibility calculator confirmation. 97.44% EU Efficiency & Burst Mode The IQ9N achieves a 97.44% European weighted efficiency and 97.95% peak inverter efficiency — among the highest in its class. Enphase's patented Burst Mode technology keeps the unit harvesting energy during low-irradiance conditions (early morning, late evening, overcast skies) when conventional inverters would simply cut out, maximising annual yield particularly in the UK climate. Integrated Stäubli MC4 & Simple AC Cabling The DC side ships with integrated Stäubli MC4 connectors — the industry-standard, weatherproof plug accepted by virtually every PV module manufacturer. On the AC side, the IQ9N uses Enphase IQ Cabling, a daisy-chain trunk cable system that eliminates individual junction boxes on each inverter, cutting installation time significantly. The unit is Class II double-insulated, so no additional earth bonding is needed at the inverter. Built-In Rapid Shutdown & Low-Voltage DC Operating at a maximum of 60 V DC — well below the 120 V threshold considered hazardous — the IQ9N provides inherent rapid shutdown at module level the moment grid power is lost or the system is isolated. There is zero inverter back-feed current to the array (Irms = 0 A), and night-time standby power is just 40 mW, minimising parasitic draw during hours of darkness. IP67 Outdoor Rating & 1 Million+ Hours Testing The corrosion-resistant polymeric enclosure carries a full IP67 ingress protection rating — fully dust-tight and withstanding temporary immersion. It is rated for relative humidity up to 100% (condensing) and ambient temperatures from −40°C to +65°C, covering the most extreme UK and European rooftop conditions. Each IQ9N undergoes over one million power-on hours of cumulative reliability testing, underpinning the 25-year warranty offer. Smart Grid Functions & PLC Monitoring The IQ9N complies with G98, G99, G100 and Northern Ireland variants G98-NI / G99-NI, covering all UK grid connection scenarios. Advanced grid functions include Power Export Limiting (PEL), Phase Imbalance Management (PIM), Loss of Phase detection (LOP), and reactive power control Q(U) / cos(phi)(P). Communication uses narrowband PLC at 110–120 kHz via the existing AC cable — no separate data wiring required. DC Input (IQ9N-A-INT) Minimum / Maximum input voltage 18 V / 60 V Startup input voltage 21 V Rated input voltage 36.5 V Minimum / Maximum MPP voltage 28 V / 45 V Minimum / Maximum operating voltage 18 V / 58 V Maximum input current (Idcmax) 16 A Maximum short-circuit DC input current (Iscmax) 25 A (module Isc ≤ 20 A, applying 1.25 safety factor per IEC 62548) Maximum input power (Pdcmax) 600 W Maximum inverter back-feed current to array 0 A DC connector type Stäubli MC4 (integrated) Number of MPP trackers 1 (single pair of DC connectors) AC Output (IQ9N-A-INT) Maximum apparent power (Sac,max) 427 VA Rated power (Pac,r) 427 W Nominal grid voltage 230 V Minimum / Maximum grid voltage 184 V / 276 V Maximum output current (Iacmax) 1.86 A Nominal frequency 50 Hz Minimum / Maximum frequency 45 Hz / 55 Hz Power factor 1.0 (range: 0.8 leading to 0.8 lagging) Total harmonic distortion (THD) <3% Maximum output fault current 2.32 A Inverter topology Isolated (HF transformer) AC connector type Enphase IQ Cabling Max units per 16 A single-phase circuit (L+N) 8 Max units per 16 A three-phase circuit (3L+N) 24 Max units per IQ Cable section (L+N / 3L+N) 7 / 15 Efficiency Peak inverter efficiency (ηmax) 97.95% European weighted efficiency (ηEU) 97.44% Night-time power loss 40 mW Mechanical & Environmental Dimensions (H × W × D, without brackets) 214 × 176 × 30.8 mm Weight (with mounting plate) 1.1 kg Ingress protection IP67 (outdoor rated, suitable for wet locations) Ambient air temperature range −40°C to +65°C Relative humidity 4% to 100% (condensing) Maximum altitude 3,000 m Cooling Natural convection (fanless) Enclosure Class II double-insulated, corrosion-resistant polymeric Noise level <25 dBA Protective class (all ports) Class II AC overvoltage category Category III Pollution degree PD3 Communications & Advanced Functions Communication method Power Line Communication (PLC), 110–120 kHz narrowband 200 Hz (Class B) Advanced grid functions Power Export Limiting (PEL), Phase Imbalance Management (PIM), Loss of Phase detection (LOP), Q(U) reactive power, cos(phi)(P) Standards & Certifications Grid compliance G98, G99, G100, G98-NI, G99-NI Safety EN IEC 62109-1, EN IEC 62109-2 EMC EN IEC 61000-3-2, 61000-3-3, 61000-6-2, 61000-6-3, EN IEC 50065-1, 50065-2-2, EN 55011 Product labelling CE Warranty Up to 25 years (requires internet-connected Enphase IQ Gateway) Manufacturer Enphase Energy Inc., 47281 Bayside Pkwy, Fremont, CA 94538, USA EU Importer Enphase Energy NL B.V., Het Zuiderkruis 65, 5215MV, 's-Hertogenbosch, Netherlands Frequently Asked Questions Do I need to notify my DNO before installing the IQ9N? Yes. All grid-connected solar PV installations in the UK require DNO notification. Installations up to 3.68 kW per phase (roughly 8–9 IQ9N units per phase) use the simplified G98 notification route — you notify the DNO after commissioning. Larger installations, or those on weak grid connections, require G99 prior approval before work begins. Northern Ireland has separate equivalents: G98-NI and G99-NI. The IQ9N is pre-certified for all four standards. How many IQ9N microinverters can I put on one circuit? On a 16 A single-phase (L+N) circuit, the maximum is 8 units using 2.5 mm² stranded IQ Cable conductors with a 1.25 safety factor per IEC 60364. On a 16 A three-phase (3L+N) circuit, the limit is 24 units (8 per phase). Additionally, for cable voltage-rise management, no more than 7 units per IQ Cable section (single-phase) or 15 units per section (three-phase) should be connected, with centre feeding as best practice. Can I add IQ9N units to my existing Enphase IQ7 or IQ8 system? Yes, with some conditions. IQ9N microinverters can be added to an existing IQ7 or IQ8 system on the same IQ Gateway in Solar Only or Solar Plus Battery (IQ Battery 3T/10T/5P) grid-tied configurations. However, you cannot add IQ7 or IQ8 units to a site where IQ9N is already the primary microinverter. In a mixed IQ7/IQ8/IQ9N array, the module-specific Sunlight Jump Start feature is lost (though a mixed IQ8 + IQ9N system does retain it). Always use the Enphase Compatibility Calculator to confirm your specific configuration. Which solar panels are compatible with the IQ9N? The IQ9N supports all common PV module powers and cell architectures — including monocrystalline, polycrystalline, PERC, TOPCon, HJT and back-contact cells. There is no enforced DC/AC ratio and the maximum DC input is 600 W. The panel's Voc must stay below 60 V and the Isc (multiplied by 1.25 per IEC 62548) must not exceed 20 A. Use the official Enphase Compatibility Calculator at enphase.com/en-gb/installers/microinverters/calculator to confirm pairing before ordering. Is the 25-year warranty automatic? No. The 25-year limited warranty is conditional on having an internet-connected Enphase IQ Gateway installed at the same site. Without a connected gateway, the standard warranty period applies. The IQ Gateway also enables remote firmware updates, live monitoring via the Enphase Enlighten platform, and advanced grid-function configuration — so it is strongly recommended as part of every IQ9N installation regardless of warranty considerations. Does the IQ9N include rapid shutdown, and is it safe for firefighters? Yes. Rapid shutdown is built into every IQ9N at module level. Because the DC operating voltage never exceeds 60 V (well below the 120 V hazard threshold), the roof is inherently safe the moment grid power is removed or the AC isolator is opened — no additional rapid shutdown device or rooftop relay is required. The inverter produces zero back-feed current to the PV array, and the isolated HF transformer topology ensures complete galvanic separation between the DC and AC circuits.