enphase IQ8AC User manual

INSTALLATION AND OPERATION MANUAL - UK
© 2023 Enphase Energy Inc. All rights reserved. September 2023
IOM-00029-1.0
Enphase IQ8MC, IQ8AC, and IQ8HC
Microinverters

IQ8MC/IQ8AC/IQ8HC Installation and Operation Manual
2 © 2023 Enphase Energy Inc. All rights reserved. September 2023
IOM-00029-1.0
Corporate Headquarters Contact Information
Enphase Energy Inc.
47281 Bayside Pkwy, Fremont, Ca 94538, United States, Ph: [phone]
https://enphase.com/contact/support
Other information
Product information is subject to change without notice. All trademarks are recognized as the property of their
respective owners.
User documentation is updated frequently; check the Enphase website for the latest information.
https://enphase.com/en-gb/installers/resources/documentation
To ensure optimal reliability and to meet warranty requirements, the Enphase microinverter must be installed
according to the instructions in this manual. For warranty text, refer to
enphase.com/installers/resources/warranty
For Enphase patent information, refer to https://enphase.com/patents
Any third-party manufacturer or importer of product(s) used to install or commission Enphase product(s) shall
comply with the applicable EU Directive(s) and requirements in the EEA (European Economic Area). It is the
responsibility of the installer to confirm that all such products are labeled correctly and have the required
compliant supporting documentation.
Manufacturer:
Enphase Energy Inc.
47281 Bayside Pkwy,
Fremont, CA, 94538
United States of America
PH: [phone]
Importer:
Enphase Energy NL B.V.,
Het Zuiderkruis 65,
5215MV, ‘s-Hertogenbosch,
The Netherlands,
PH: [phone]
Compliance with EU Directives
This product complies with the following EU Directives and can be used in the European Union without any
restrictions.
•Electro Magnetic Compatibility (EMC) directive 2014/30/EU
•Low voltage directive (LVD) 2014/35/EU
•Restriction of Hazardous Substances (RoHS) 2011/65/EU
The full text of the EU declaration of conformity (DoC) is available at the following internet address
https://enphase.com/en-gb/installers/resources/documentation
© 2023 Enphase Energy. All rights reserved. Enphase, the e and CC logos, IQ, and certain other marks listed
at https://enphase.com/trademark-usage-guidelines are trademarks of Enphase Energy, Inc. in the US and
other countries. Data subject to change.
Audience
This manual is intended for use by professional installation and maintenance personnel.

IQ8MC/IQ8AC/IQ8HC Installation and Operation Manual
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Contents
Important safety information............................................................................................................................... 4
Read this first ......................................................................................................................................................4
Product labels.....................................................................................................................................................4
Safety and advisory symbols............................................................................................................................4
IQ8 Series Microinverters safety instruction .................................................................................................5
1. The Enphase Energy System....................................................................................................................... 8
2. Planning for microinverter installation.....................................................................................................10
3. Parts and tools required ............................................................................................................................. 12
4. Enphase microinverters installation ......................................................................................................... 13
Step 1: Position the IQ Cable........................................................................................................................... 14
Step 2: Position the junction box ................................................................................................................... 14
Step 3: Mount the microinverters .................................................................................................................. 14
Step 4: Create an installation map................................................................................................................. 15
Step 5: Manage the cabling ............................................................................................................................ 16
Step 6: Connect the microinverters .............................................................................................................. 16
Step 7: Terminate the unused end of the IQ Cable...................................................................................... 17
Step 8: Complete the installation of the junction box ................................................................................ 18
Step 9: Connect the PV modules ................................................................................................................... 18
Step 10: Energize the system .......................................................................................................................... 19
4.1 Set up and activate monitoring ........................................................................................................ 19
5. Troubleshooting..........................................................................................................................................20
5.1 Status LED indications and error reporting................................................................................... 20
5.2 Troubleshoot an inoperable microinverter..................................................................................... 21
5.3 Disconnect a microinverter ............................................................................................................. 22
5.4 Install a replacement microinverter................................................................................................ 22
5.5 Enphase IQ Cable planning and ordering...................................................................................... 23
5.6 Enphase IQ Cable accessories .........................................................................................................24
6. Technical data ............................................................................................................................................. 25
6.1 Technical considerations.................................................................................................................. 25
6.2 Bifacial modules................................................................................................................................. 25
6.3 PQ capability curve........................................................................................................................... 25
7. Specifications.............................................................................................................................................. 26
7.1 IQ8MC-72-M-INT Microinverter specifications ............................................................................ 26
7.2 IQ8AC-72-M-INT Microinverter specifications..............................................................................28
7.3 IQ8HC-72-M-INT Microinverter specifications.............................................................................30
7.4 Enphase installation map.................................................................................................................. 32
7.5 Sample wiring diagram ..................................................................................................................... 33
Revision history.................................................................................................................................................... 35

IQ8MC/IQ8AC/IQ8HC Installation and Operation Manual
4 © 2023 Enphase Energy Inc. All rights reserved. September 2023
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Important safety information
Read this first
This manual contains important instructions for use during the installation and maintenance of the IQ8 Series
Microinverters.
IMPORTANT: Enphase IQ8 Series Microinverters listed in this manual require the IQ Cable. An IQ
Gateway is required to monitor the performance and, where required, provide control of the IQ8
Series Microinverters.
Product labels
The following symbols appear on the product label and are described here:
Safety and advisory symbols
To reduce the risk of electric shock and to make sure the safe installation and operation of the IQ8 Series
Microinverters System, the following safety symbols appear throughout this document to indicate dangerous
conditions and important safety instructions.
DANGER:
This indicates a hazardous situation, which, if not avoided, will result in death
or serious injury.
WARNING: This indicates a situation where failure to follow instructions may be a safety
hazard or cause equipment malfunction. Use extreme caution and follow
instructions carefully.
WARNING:
This indicates a situation where failure to follow instructions may result in burn
injury.
NOTE:
This indicates information that is very important for optimal system operation.
Follow instructions closely.
WARNING: Hot surface
DANGER: Refer to safety instructions
DANGER: Risk of electric shock
Refer to the manual
Double insulated

IQ8MC/IQ8AC/IQ8HC Installation and Operation Manual
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IQ8 Series Microinverters safety instruction
General safety
DANGER: Risk of
electric shock.
Risk of fire.
Only use electrical system components approved for wet locations.
Only competent personnel should install, troubleshoot, or replace Enphase
microinverters or IQ Cable and accessories.
Make sure that all AC and DC wiring is correct and that none of the AC or DC
cables are pinched, shorted, or damaged. Make sure that all AC junction boxes
are properly closed.
Do not exceed the maximum number of microinverters in an AC branch circuit
as listed in the manual. You must protect each microinverter AC branch circuit
with a 20 A (single-phase and multi-phase) maximum breaker or fuse, as
appropriate.
DANGER: Risk
of electric
shock.
Do not use Enphase equipment in a manner not specified by the manufacturer.
Doing so may cause death or injury to persons or damage to equipment.
Be aware that installation of this equipment includes a risk of electric shock.
The DC conductors of this photovoltaic system are ungrounded and may be
energized.
Always de-energize the AC branch circuit before servicing. Never disconnect
the DC or AC connectors under load.
WARNINGS:
Before installing or using the Enphase microinverter, read all instructions and
cautionary markings in the technical description, on the Enphase equipment,
and on the photovoltaic (PV) equipment.
Do not connect Enphase microinverters to the grid or energize the AC
circuit(s) until you have completed all the installation procedures and have
received approval from the electrical network operator.
When the PV array is exposed to light, DC voltage is supplied to the power
conversion equipment (PCE).
Risk of equipment damage. Enphase male and female connectors must only be
mated with the identical type and brand of male/female connector.
NOTES:
To ensure optimal reliability and to meet warranty requirements, install the
Enphase equipment according to the instructions in this manual.
The AC and DC connectors on the cabling are rated as a disconnect only
when used with an Enphase microinverter.
Protection against lightning and resulting voltage surge must be in
accordance with local electrical codes and standards.
Perform all electrical installations in accordance with all applicable local
electrical codes and standards.
Microinverter safety
WARNING: Risk of
skin burn.
The chassis of the Enphase microinverter is the heat sink. Under normal
operating conditions, the temperature could be 20°C above ambient
temperature, but under extreme conditions, the microinverter can reach a
temperature of 90°C. To reduce the risk of burns, use caution when working
with microinverters.
DANGER: Risk of
fire.
The DC conductors of the PV module must be labelled "PV Wire" or "PV Cable"
when paired with the Enphase microinverter.
DANGER: Risk of
electric shock.
Risk of fire.
Only competent personnel may connect the Enphase microinverter to the
electricity grid.
Do not attempt to repair the Enphase microinverter; it contains no user-
serviceable parts. If it fails, contact Enphase Support to obtain a return
merchandise authorization (RMA) number and start the replacement process.
Tampering with or opening the Enphase microinverter will void the warranty.

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WARNING: Risk
of equipment
damage.
Install the microinverter under the PV module to avoid direct exposure to rain,
UV, and other harmful weather events. Always install the microinverter bracket
side up. Do not mount the microinverter upside down. Do not expose the AC or
DC connectors (on the IQ Cable, PV module, or microinverter) to rain or
condensation before the connectors are mated.
The maximum open circuit voltage of the PV module must not exceed the
specified maximum input DC voltage of the Enphase microinverter. Refer to the
Enphase Compatibility Calculator to verify PV module electrical compatibility
with the microinverter. Use IQ8 Series Microinverters only with compatible PV
modules as per Enphase Compatibility Calculator. Using an electrically
incompatible PV module voids Enphase warranty.
WARNING: Risk
of equipment
damage.
You must match the DC operating voltage range of the PV module with the
allowable input voltage range of the Enphase microinverter.
The Enphase microinverter is not protected from damage due to moisture
trapped in cabling systems. Never mate microinverters to cables that have been
left disconnected and exposed to wet conditions. This voids the Enphase
warranty.
WARNING: Risk
of equipment
damage.
The Enphase microinverter functions only with a standard, compatible PV
module with appropriate fill factor, voltage, and current ratings. Unsupported
devices include smart PV modules, fuel cells, wind or water turbines, DC
generators, non-Enphase batteries, and other devices. These devices do not
behave like standard PV modules, so operation and compliance are not
guaranteed. These devices may also damage the Enphase microinverter by
exceeding its electrical rating, making the system potentially unsafe.
NOTES:
The Enphase microinverter has field-adjustable voltage and frequency trip
points that may need to be set, depending upon local requirements. Only a
competent authorized installer with the permission and following requirements
of the local electrical authorities should make adjustments.
NOTES:
Installers must check the manufacturing date of the products to ensure that the
installation date is within one year of the manufactured date of the products.
Contact your local distributor to validate the date code.
NOTES:
Use a G99 approved third party network protection relay for PV systems with
system size above 17kW per phase.
Enphase IQ Cable safety
DANGER: Risk of
electric shock.
Do not install the IQ Terminator while the power is connected.
WARNING: Risk
of electric shock.
Risk of fire.
When stripping the sheath from the IQ Cable, make sure the conductors are
not damaged. If the exposed conductors are damaged, the system may not
function properly.
Do not leave AC connectors on the IQ Cable uncovered for an extended
period. You must cover any unused connector with an IQ Sealing Cap.
Make sure protective IQ Sealing Caps have been installed on all unused AC
connectors. Unused AC connectors are live when the system is energized.
WARNING:
Use the IQ Terminator only once. If you open the IQ Terminator following
installation, the latching mechanism is destroyed. If the latching mechanism
is defective, do not use the IQ Terminator. Do not circumvent or manipulate
the latching mechanism.
When installing the IQ Cable, secure any loose cable to avoid the risk of
cable insulation abrasion against the roof surface.

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NOTES:
When looping the IQ Cable, do not form loops smaller than 120 mm in
diameter.
Provide support for the IQ Cable every 300 mm.
If you need to remove IQ Sealing Cap, you must use the IQ Disconnect Tool.
When installing the IQ Cable and accessories, adhere to the following:
•Do not expose the IQ Terminator cap or cable connections to
directed, pressurized liquid (water jets).
•Do not expose the IQ Terminator or IQ Cable to continuous
immersion.
•Do not expose the IQ Terminator cap or IQ Cable connections to
continuous tension (for example, tension due to pulling or bending
the cable near the connection).
•Use only the compatible Enphase IQ connectors.
•Do not allow contamination or debris in the connectors.
•Use the IQ Terminator cap and cable connections only when all
parts are present and intact.
•Do not install or use in potentially explosive environments.
•Do not allow the IQ Terminator to come into contact with an open
flame.
•Fit the IQ Terminator cap using only the prescribed tools and in the
prescribed manner.
•Use only the IQ Terminator to seal the conductor end of the IQ
Cable; no other method is allowed.
DC cable safety
NOTES:
•
Ensure proper routing of PV Module DC cable using the clips to
prevent the leads from resting on the roof. Do not wrap excess DC
cable around the microinverter.
•Avoid direct exposure to sunlight.
•Avoid sharp edges on racking.
•Avoid cable contacting rough surfaces or moving parts within the
racking system.
•Avoid overly tight bending radii. The minimum bend radii for the DC
cable is 8 X cable outer diameter.
•
Avoid overly tight-sized cable clips for routing.

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1. The Enphase Energy System
The Enphase Energy System includes:
•IQ8MC, IQ8AC, and IQ8HC Microinverters: The smart grid-ready IQ8 Series Microinverters
convert the DC output of the PV module into grid-compliant AC power.
•IQ Gateway:An IQ Gateway (model ENV-S-EM-230, ENV-S-WM-230, or ENV-S-WB-230) is
required to monitor solar production, to propagate a grid profile to the microinverters and to
provide microinverter control at sites where power export limit (PEL) and /or phase imbalance
management (PIM) is required through advanced grid functionalities. The IQ Gateway is a
communication device that provides network access to the PV array. The IQ Gateway collects
production and performance data from the IQ8 Series Microinverters over on-site AC power lines
and transmits the data to Enphase App through a broadband or cellular connection. The IQ
Gateway can monitor up to 300 IQ8 Series Microinverters and up to 12 IQ Battery 5P units. For
details, refer to Enphase IQ Gateway Installation and Operations Manual.
•Enphase Installer Portal.A web-based monitoring and management software: Installers
can use Enphase Installer Portal to view detailed performance data, manage multiple PV
systems, and remotely resolve issues that might impact system performance. Find out more
at https://enphase.com/en-gb/installers/apps.
•Enphase Installer App. A Mobile app for iOS and Android devices: It allows installers to
configure the system while on-site, eliminating the need for a laptop and improving
installation efficiency. You can use the app to:
oConnect to the IQ Gateway over a wireless network for faster system setup and
verification.
oScan device serial numbers and sync system information with Enphase Installer Portal.
oView and email a summary report that confirms a successful installation.
•IQ Battery 5P: Offers energy storage solutions.
•IQ Field Wireable Connectors (single-phase: Q-CONN-R-10F and Q-CONN-R-10M; multi-
phase: Q-CONN-3P-10M and Q-CONN-3P-10F): Make connections from any IQ Cable.
This manual describes the safe installation and operation of the IQ8 Series Microinverters.
NOTE: To ensure optimal reliability and to meet warranty requirements, Enphase microinverters must
be installed according to the instructions in this manual.

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How the Enphase IQ8 Series Microinverters work
The Enphase microinverter maximizes energy production by using a sophisticated maximum power point
tracking (MPPT) algorithm. Each Enphase microinverter individually connects to one PV module in your
array. This configuration enables an individual MPPT to control each PV module, ensuring that the
maximum power available from each PV module is produced regardless of the performance of the other
PV modules in the array. While an individual PV module in the array may be affected by shading, soiling,
orientation, or PV module mismatch, each Enphase microinverter ensures top performance for its
associated PV module.
System monitoring
Once you install the IQ Gateway and provide an internet connection through a broadband router or
modem, the IQ8 Series Microinverters automatically begin reporting to Enphase Installer Platform.
Enphase Installer Platform presents current and historical system performance trends and informs you of
PV system status.
Optimal reliability
Microinverter systems are inherently more reliable than conventional string inverters. The distributed
nature of a microinverter system ensures that there is no single point of system failure in the PV system.
Enphase microinverters are designed to operate at full power at ambient temperatures as high as 65°C
(149°F).
Ease of design
PV systems using Enphase microinverters are very simple to design and install. You will not need to
perform cumbersome string sizing calculations like conventional string inverters. You can install
individual PV modules in any combination of PV module quantity, type, age, and orientation. Each
microinverter quickly mounts on the PV racking directly beneath each PV module. Low-voltage DC
cables connect from the PV module directly to the co-located microinverter, eliminating the risk of
personnel exposure to dangerously high DC voltage.
Enphase IQ
Gateway
Enphase
App
Enphase IQ
Battery
Enphase IQ
Cable
Enphase IQ
Microinverter

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2. Planning for microinverter installation
The IQ8MC, IQ8AC, and IQ8HC Microinverters support PV modules with 54-cell/108-half-cell, 60-
cell/120-half-cell, 66-cell/132-half-cell, and 72-cell/144-half-cell configurations. No enforced DC/AC
ratio and maximum input power. Modules can be paired if the maximum input voltage is not exceeded
and the maximum input current of the inverter at the lowest and highest temperatures is respected.
See Enphase Compatibility Calculator.
IQ8 Series Microinverters install quickly and easily. The microinverter housing is designed for outdoor
installation and complies with the IP67 environmental enclosure rating standard.
IP67 rating definition: indoor or outdoor use primarily to provide a degree of protection
against hose-directed water, the entry of water during occasional temporary submersion at
a limited depth, and damage from external ice formation.
The IQ Cable is available with connector spacing options to accommodate the installation of PV modules
in portrait or landscape orientation. For IQ Cable ordering information, see
Enphase IQ Cable Planning and Ordering.
Compatibility
The IQ8 Series Microinverters are electrically compatible with PV modules, as listed in the following
table. For specifications, see Technical Data. You can refer to the IQ Field Wireable Connector at
Enphase Compatibility Calculator to verify PV module electrical compatibility. To ensure mechanical
compatibility, the microinverter's male and female connectors must only be mated with the identical
type and brand of male/female connector.
IMPORTANT: The IQ8 Series Microinverters include both AC and DC connectors integrated into the
bulkhead. The AC port connects to IQ Cable or Enphase Field Wireable Connector. The DC port has been
evaluated by TUV for intermatability with Stäubli made MC4 connectors, whose cable coupler models are
"PV-KST4/…-UR, PV-KBT4/…-UR, PV-KBT4-EVO2/…-UR, and PV-KST4-EVO2/…-UR". The DC port of the
inverter must be mated with Stäubli made MC4 connectors.
WARNING: Risk of fire. The DC conductors of the PV module must be labeled "PV Wire" or "PV
Cable" when paired with the Enphase microinverter.
Microinverter model Connector type PV module cell count
IQ8MC-72-M-INT Stäubli MC4 Pair with 54-cell/108-half-cell, 60-
cell/120-half-cell, 66-cell/132-half-cell,
72-cell/144-half-cell
IQ8AC-72-M-INT Stäubli MC4
IQ8HC-72-M-INT Stäubli MC4
NOTE: Some Enphase microinverters will not begin exporting power until the IQ Gateway is
installed and has detected all the microinverters at the site. In addition, the grid profile needs to
be configured, and the IQ Gateway must have propagated these settings to the microinverters.
For instructions on this procedure, refer to the IQ Gateway Installation and Operation Manual at
https://enphase.com/en-gb/installers/resources/documentation
Earthing considerations
The microinverter has a Class II double-insulated rating, which includes ground fault protection (GFP). To
support GFP, use only PV modules equipped with DC cables labeled PV Wire or PV Cable. Refer to local
electrical codes and standards for earthing requirements of PV array and racking.

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Branch circuit capacity
Plan your AC branch circuits to meet the following limits for the maximum number of microinverters per
branch circuit.
Maximum* IQ8 Series Microinverters per AC branch circuit
Breaker IQ8MC IQ8AC IQ8HC
20 A Single-phase
11
10
9
20 A Multi-phase 33 (11 per phase) 30 (10 per phase) 27 (9 per phase)
25 A Multi-phase** 39 (13 per phase) 36 (12 per phase) 36 (12 per phase)
NOTE: * Refer to local regulations for overcurrent protection device (OCPD) sizing and define the
number of microinverters per branch in your area.
** This breaker option is not available in Europe.
Electricity network requirements
The IQ8 Series Microinverters work with single-phase or multi-phase grid connections. Measure AC line
voltages at the point of connection to confirm that it is within the ranges shown:
Conductor lengths and voltage rise
When planning the system, you must select the appropriate AC conductor size to minimize voltage rise.
Select the correct conductor size based on the distance from the junction with the microinverter AC
branch circuit to the circuit breaker in the electrical panel. Enphase recommends a voltage rise total of
less than 2% for the sections from the microinverter AC branch circuit to the circuit breaker in the
electrical panel.
Best practice: Center-feed the branch circuit to minimize voltage rise in a fully populated branch.
This practice substantially reduces the voltage rise as compared with an end-fed branch. To
center-feed a branch, divide the circuit into two sub-branch circuits protected by a single OCPD.
Lightning and surge suppression
Enphase microinverters have integral surge protection, greater than most conventional inverters. However,
if the surge has sufficient energy, the protection built into the microinverter can be exceeded, and the
equipment can be damaged. For this reason, Enphase recommends that you protect your system with a
lightning and/or surge suppression device. In addition to having some level of surge suppression, it is also
important to have insurance that protects against lightning and electrical surges.
NOTE: Protection against lightning and resulting voltage surge must be in accordance with local
electrical codes and standards.
Single-phase service
Multi-phase service
L1 to N 184 to 276 VAC L1 to L2 to L3 319 to 478 VAC
L1, L2, L3 to N
184 to 276 VAC

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3. Parts and tools required
In addition to the microinverters, PV modules, and racking, you will need the following:
Enphase equipment
•IQ Gateway: Required to monitor production. For installation information, refer to the
IQ Gateway Installation and Operations Manual.
•Enphase Installer App: Download the Enphase Installer App, open it, and
log in to your Enphase account. Use it later to scan the microinverter serial
numbers and connect to the IQ Gateway to track system installation
progress. To download, go to https://enphase.com/en-gb/installers/apps
or scan the QR code at right.
•Use a Legrand Phase Coupler (LPC-01) for a multi-phase system for phase coupling if IQ Relay is not
installed in the multi-phase system.
•Tie wraps or cable clips (ET-CLIP-100 works with both single-phase and multi-phase IQ Cable)
•IQ Sealing Cap (Q-SEAL-10): for any unused connectors on the IQ Cable.
•IQ Terminator (Q-TERM-R-10 for single-phase or Q-TERM-3P-10 for multi-phase): One for each AC
cable segment end; typically, two are needed per branch circuit.
•IQ Disconnect Tool (Q-DISC-10)
•IQ Field Wireable Connectors (male and female: single-phase; Q-CONN-R-10M and Q-CONN-R-
10F; multi-phase: Q-CONN-3P-10M and Q-CONN-3P-10F)
•IQ Cable:
Cable model
Connector
spacing
PV module
orientation
Connector count
per box
Single-phase
Q-25-10-240
1.3 m
Portrait
240
Q-25-17-240 2.0 m Landscape (60-cell) 240
Q-25-20-200
2.3 m
Landscape (72-cell)
200
Multi-phase
Q-25-10-3P-200
1.3 m
Portrait
200
Q-25-17-3P-160
2.0 m
Landscape (60-cell)
160
Q-25-20-3P-160
2.3 m
Landscape (72-cell)
160
•IQ Raw Cable (Q-25-RAW-300 for single-phase, Q-25-RAW-3P-300 for multi-phase): Length 300
meters. Raw cable with no connectors (optional).
Other items
•AC junction box
•Terminal screwdrivers
•Wire cutters, multimeter
•Torque wrench, sockets, and wrenches for mounting hardware
•Use a G99 approved third party network protection relay for PV systems with system size above 17kW
per phase.
Android
iOS

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4. Enphase microinverters installation
Installing the IQ8 Series Microinverters involves several key steps. Each step listed here is detailed in
the following pages.
Step 1: Position the IQ Cable
Step 2: Position the junction box
Step 3: Mount the microinverters
Step 4: Create an installation map
Step 5: Manage the cabling
Step 6: Connect the microinverters
Step 7: Terminate the unused end of the IQ Cable
Step 8: Complete the installation of the junction box
Step 9: Connect the PV modules
Step 10: Energize the system
Horizontal mount
Vertical mount

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Step 1: Position the IQ Cable
A. Plan each cable section to allow connectors on the IQ Cable to align with each PV module. Allow
extra length for slack, cable turns, and any obstructions.
B. Mark the approximate centers of each PV module on the PV racking.
C. Lay out the cabling along the installed racking for the AC branch circuit.
D. Cut each section of cable to meet your planned needs.
WARNING: When transitioning between rows, secure the cable to the rail to prevent cable
damage or connector damage. Do not put the connector at the microinverter under tension.
Step 2: Position the junction box
A. Verify that the AC voltage at the site is within range.
*Nominal voltage range can be extended beyond nominal if required by the electricity network operator.
B. Install a junction box/AC isolator at a suitable location.
C. Provide an AC connection from the junction box/AC isolator back to the electricity network using
equipment and practices in accordance with local electrical codes and standards.
D. For multi-phase installations, verify the IQ Cable wiring colour codes are correctly terminated: L1-
Brown, L2-Black, L3-Grey, N-Blue.
WARNING: Blue conductor in IQ Cable should be used only for
neutral connection. Incorrect termination may irrecoverably
damage any connected microinverters.
Step 3: Mount the microinverters
A. The microinverters should be mounted beneath the modules either horizontal bracket side up or
vertical orientation to the module and must be protected from direct exposure to rain, UV, and other
harmful weather events. Please refer to the image below for clearance requirements during vertical
mounting.
•Always place the microinverter under the PV module, protected from direct exposure to rain,
sun, and other harmful weather events. Allow a minimum of 19 mm (3 /4") between the roof
and the microinverter. Also, allow 13 mm (1/2") between the back of the PV module and the
top of the microinverter.
•For vertical mount, also maintain at least 300 mm (12") clearance from the edges of the PV
module to protect the microinverter from direct exposure to rain, UV, and other harmful
weather events.
WARNING: Install the microinverter under the PV module to avoid direct exposure to rain, UV, and
other harmful weather events. Do not mount the microinverter upside down.
B. Torque the microinverter fasteners as follows. Do not over-torque.
•6 mm mounting hardware: 5 N m
•8 mm mounting hardware: 9 N m
Single-phase service
Multi-phase service
L1 to N 184 to 276 VAC*
L1 to L2 to L3
319 to 478 VAC*
L1, L2, L3 to N
184 to 276 VAC*
L3
N
L2
L1

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•When using mounting hardware from a third-party manufacturer, use the manufacturer's
recommended torque value.
Horizontal mount
Vertical mount
Step 4: Create an installation map
The Enphase installation map is a diagram of the physical location of each microinverter in your PV array.
Copy or use the blank map to record microinverter
placement for the system or provide your own layout if
you require a larger or more intricate installation map.
Each Enphase microinverter, IQ Gateway,and IQ
Battery have a removable serial number label. Build the
installation map by peeling the serial number labels
from the microinverter mounting plates and placing the
labels on the map. You should also place the IQ
Gateway and IQ Battery serial numbers on the map
after installation.
After you have created the installation map, use the
Enphase Installer App to record serial numbers and
configure the system.
Affix serial number labels
>38 mm

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For details, refer to Detect the Microinverters in the help topics of the Enphase Installer App.
A. Peel the removable serial number label from each microinverter and affix it to the respective location
on the paper installation map.
B. Peel the label from the IQ Gateway and any IQ Battery (if installed) and affix it to the installation map.
C. Always keep a copy of the installation map for your records.
Step 5: Manage the cabling
A. Use cable clips or tie wraps to attach the cable to the racking. The IQ Cable must be supported at
least every 300 mm.
B. Dress any excess cabling in loops so that it does not contact the roof. Do not form loops smaller
than 120 mm in diameter.
WARNING: Dress the excess IQ Cable to avoid the risk of cable insulation abrasion against the roof
surface.
Step 6: Connect the microinverters
A. Connect the IQ Cable to the microinverter. Listen for a click as the connectors engage.
B. Seal any unused connector on the IQ Cable with IQ Sealing Cap. Listen for a click as caps engage.
WARNING: Risk of electric shock. Risk of fire. Install IQ Sealing Caps on all unused AC connectors,
as these connectors become live when the system is energized. IQ Sealing Caps are required for
protection against moisture ingress.
NOTE: If you need to remove an IQ Sealing Cap, you must use the IQ Disconnect Tool.
Cable clip

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Step 7: Terminate the unused end of the IQ Cable
Terminate the unused end of the IQ Cable as follows.
NOTE: Turn only the hex nut to prevent conductors from twisting out of the separator.
WARNING: The IQ Terminator cannot be re-used. If you unscrew the nut, you must discard the IQ
Terminator.
Single-phase IQ Cable
Multi-phase IQ Cable
A. Remove 13 mm of the
cable sheath from
the conductors. Use
the IQ Terminator
body loop to
measure
A. Remove 20 mm of
the cable sheath
from the conductors
B. Slide the hex nut
onto the cable.
B. Slide the hex nut
onto the cable.
C. Insert the cable into
the IQ Terminator
body so
that the two wires
land on opposite
sides of the internal
separator. The
grommet inside the
IQ Terminator body
must remain in place
C. Insert the cable into
the IQ Terminator
body so that the four
wires land on
separate sides of the
internal separator.
The grommet inside
the IQ Terminator
body must remain in
place
D. Insert a screwdriver
into the slot on the
top of the IQ
Terminator to hold it
in place. Hold the IQ
Terminator body
stationary with the
screwdriver and turn
only the hex nut to
prevent the
conductors from
twisting out of the
separator. Torque the
nut to 7 N m.
D. Bend the wires down
into the recesses of
the IQ Terminator
body and trim as
needed. Place the
cap over the IQ
Terminator body.
Insert a screwdriver
into the slot on the
IQ Terminator cap to
hold it in place.
Rotate the hex nut
with your hand or a
wrench until the
latching mechanism
meets the base. Do
not over-torque.
E. Secure the terminated cable end to the PV
racking with a cable clip or tie wrap so that the
cable and IQ Terminator are not in contact with
the roof surface.
E. Secure the terminated cable end to the PV
racking with a cable clip or tie wrap so that the
cable and IQ Terminator are not in contact with
the roof surface.

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Step 8: Complete the installation of the junction box
A. Connect the IQ Cable to the junction box.
B. Refer to the electrical diagrams for more information. Conductor colours are listed below:
NOTE: The multi-phase IQ Cable internally rotates L1, L2, and L3 to provide balanced 400 VAC
(multi-phase), thus alternating phases between microinverters.
NOTE: Minimize the number of unused IQ Cable connectors with multi-phase systems. When
cable connectors are left unused on a multi-phase system, it creates a phase imbalance on the
branch circuit. If multiple cable connectors are skipped over multiple branch circuits, the
imbalance will multiply.
Step 9: Connect the PV modules
WARNING: Electric shock hazard. The DC conductors of this photovoltaic system are not earthed
and will be energized when PV modules are exposed to
sunlight.
A. Connect the DC leads of each PV module to the DC
input connectors of the corresponding microinverter.
B. Check the LED on the connector side of the
microinverter. The LED flashes green six times when DC
power is applied.
C. Mount the PV modules above the microinverters.
Single-phase Multi-phase
Brown – L1
Blue – N
Brown – L1
Black – L2
Grey – L3
Blue – N
DC connectors
Status LED

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Step 10: Energize the system
A. Turn ON the AC disconnect or circuit breaker for the branch circuit.
B. Your system will ramp up to full producing power after grid profile propagation and device
provisioning are completed. It may take 20-30 minutes for full power production based on the
number of microinverters in the system.
C. Check the LED on the connector side of the microinverter:
LED colour Indicates
Flashing green
Normal operation. AC grid function is normal, and there is communication
with the IQ Gateway. IQ8 Series Microinverter's LED will be flashing green
only after provisioning.
Flashing orange
The AC grid is normal but there is no communication with the IQ Gateway.
Flashing red
The AC grid is either not present or not within the specification.
Solid red
There is an active DC Resistance Low, Power Off condition. To reset, refer to
the IQ Gateway Installation and Operation Manual at:
https://enphase.com/en-gb/installers/resources/documentation.
If the problem persists, measure resistance between PV+ to EARTH and then
PV- to EARTH on the PV module and then inverter. Anything less than ~7 kΩ
will trigger the DC Resistance Low, Power Off condition. Usually, the value is
in MΩ on the inverter or PV module. Swap out faulty PV module or
microinverter.
Refer to the IQ Gateway Quick Install Guide to install the gateway and set up system monitoring and grid
management functions.
4.1 Set up and activate monitoring
Refer to the IQ Gateway Quick Install Guide to install the gateway and set up system monitoring and grid
management functions. This guide leads you through the following:
•Connecting the gateway
•Detecting devices
•Connecting to Enphase Installer Platform
•Registering the system
•Building the virtual array
NOTE: When the electricity network operator requires a grid profile other than the profile set on
the microinverter, you must select an appropriate grid profile for your installation. Your system
will ramp up to full power after grid profile propagation and device provisioning is completed. It
may take 20-30 minutes for full power production based on the number of microinverters in the
system.
You can set the grid profile through Enphase Installer Platform, during system registration, or through
Enphase Installer App at any time. You must have an IQ Gateway to set or change the grid profile. For more
information on setting or changing the grid profile, refer to the IQ Gateway Installation and Operation
Manual at https://enphase.com/en-gb/installers/resources/documentation

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5. Troubleshooting
Follow all the safety measures described in this manual. Competent personnel can use the
following troubleshooting steps if the PV system does not operate correctly.
WARNING: Risk of electric shock. Do not attempt to repair the Enphase microinverter; it contains
no user-serviceable parts. If it fails, contact Enphase Support to obtain a return merchandise
authorization (RMA) number and start the replacement process.
5.1 Status LED indications and error reporting
The following section describes LED indications.
LED operation
LED colour
Indicates
Flashing green
Normal operation. AC grid function is normal and there is communication with
the IQ Gateway
Flashing orange
The AC grid is normal but there is no communication with the IQ Gateway
Flashing red
The AC grid is either not present or not within the specification
Solid red
There is an active DC Resistance Low, Power Off condition. To reset, refer to
the IQ Gateway Installation and Operation Manual at:
https://enphase.com/en-gb/installers/resources/documentation.
If the problem persists, measure resistance between PV+ to EARTH and then PV-
to EARTH on the PV module and then inverter. Anything less than ~7 kΩ will
trigger the DC Resistance Low, Power Off condition. Usually, the value is in MΩ
on the inverter or PV module. Swap out faulty PV module or microinverter
The status LED on each microinverter lights green about six seconds after DC power is applied. It remains
lit solid for two minutes, followed by six green flashes. After that, red blinks indicate that no grid is present
if the system is not yet energized.
Any short red blinks after DC power is first applied to the microinverter indicate a failure during
microinverter startup.
DC Resistance Low – Power Off condition
For all IQ8 Series Microinverters, a solid red status LED when DC power has been cycled indicates the
microinverter has detected a DC Resistance Low – Power Off event. The LED will remain red, and the
fault will continue to be reported by the gateway until the error has been cleared.
An insulation resistance (IR) sensor in the microinverter measures the resistance between the positive
and negative PV inputs to the ground. If either resistance drops below a threshold of 7kΩ, the
microinverter stops power production and raises this condition. This may indicate defective module
insulation, defective wiring or connectors, moisture ingress, or a similar problem. Although the cause
may be temporary, this microinverter condition persists until the sensor is manually reset.
An IQ Gateway is required to clear this condition. The condition clears on operator command unless its
cause is still present.
If a microinverter registers a DC Resistance Low-Power Off condition, you can attempt to clear this
condition. If the condition does not clear after you perform the following procedure,
contact Enphase Support.
Follow the steps below to send a clear message to the microinverter. Note that the condition will not clear
after the sensor reset if the cause of the failure is still present. If the condition persists, contact your
installer.