enphase M250 User manual

INSTALLATION AND OPERATION MANUAL
141-00024, Rev 02b
M-Series Enphase Microinverter
(M250 and M215)

Enphase Microinverter Installation and Operation
2016 Enphase Energy. All rights reserved. 141-00024 Rev 02b
2
Corporate Headquarters Contact Information
Enphase Energy Inc.
1420 N. McDowell Blvd.
Petaluma, CA 94954
USA
http://www.enphase.com
Other Information
Product information is subject to change without notice. All trademarks are recognised as the property of
their respective owners.
User documentation is updated frequently; Check the Enphase website
(http://www.enphase.com/support) for the latest information.
For warranty text refer to http://www.enphase.com/warranty.
For Enphase patent information refer to http://enphase.com/company/patents/.
© 2016 Enphase Energy Inc. All rights reserved.
Audience
This manual is intended for use by professional installation and maintenance personnel.

M-Series Microinverter Installation and Operation
2016 Enphase Energy. All rights reserved. 141-00024 Rev 02b
3
Table of Contents
Important Safety Information..........................................................................................................................................4
Read this First .................................................................................................................................................4
Product Labels.................................................................................................................................................4
Safety and Advisory Symbols..........................................................................................................................4
Safety Instructions...........................................................................................................................................4
General Safety..............................................................................................................................................................4
Microinverter Safety ......................................................................................................................................................5
Engage Cable and Accessory Safety ............................................................................................................................6
The Enphase Microinverter System...............................................................................................................................7
How the Microinverter Works...........................................................................................................................8
System Monitoring.........................................................................................................................................................8
Optimal Reliability .........................................................................................................................................................8
Ease of Design..............................................................................................................................................................8
Planning for Microinverter Installation............................................................................................................................9
Compatibility and Capacity ..............................................................................................................................9
Compatibility .................................................................................................................................................................9
Branch Circuit Capacity.................................................................................................................................................9
Utility Service Requirements..........................................................................................................................................9
Lightning and Surge Suppression..................................................................................................................10
Parts and Tools Required..............................................................................................................................10
Enphase Equipment....................................................................................................................................................10
Other Items.................................................................................................................................................................10
Example Single-Phase Design ......................................................................................................................11
Enphase Items Needed for Example Design ...............................................................................................................12
Non-Enphase Items Needed for Example Design........................................................................................................12
Enphase Microinverter Installation...............................................................................................................................13
Step 1: Register the System..........................................................................................................................14
Step 2: Connect the Envoy Communications Gateway .................................................................................15
Step 3: Position the Enphase Engage™ Cable .............................................................................................16
Step 4: Install an AC Junction Box.................................................................................................................17
Step 5: Attach the Microinverters to the Mounting Rail..................................................................................18
Step 6: Dress the Engage Cable...................................................................................................................19
Step 7: Connect the Microinverters................................................................................................................20
Step 8: Terminate the Unused End of the Engage Cable..............................................................................21
Step 9: Connect the Engage Cable to AC Junction Box................................................................................22
Step 10: Complete the Installation Map.........................................................................................................23
Step 11: Connect the PV Modules.................................................................................................................23
Commissioning and Operation.....................................................................................................................................24
Energise the System......................................................................................................................................24
Check the Envoy's progress..........................................................................................................................24
Configure the Grid Profile..............................................................................................................................25
Build the Virtual Array....................................................................................................................................25
Troubleshooting...........................................................................................................................................................26
Status LED Indications and Error Reporting..................................................................................................26
Start-up LED Operation...............................................................................................................................................26
Post-Start-up LED Indications .....................................................................................................................................26
Reported Faults...........................................................................................................................................................26
Troubleshoot an Inoperable Microinverter.....................................................................................................27
Disconnect a Microinverter ............................................................................................................................28
Install a Replacement Microinverter...............................................................................................................29
Engage Cable Planning and Ordering .........................................................................................................................30
Selecting Cable Type.....................................................................................................................................30
Connector Spacing Options...........................................................................................................................30
Voltage Type and Conductor Count Options.................................................................................................31
Cabling Length Options.................................................................................................................................31
Planning for Cable Lengths and Type............................................................................................................31
Technical Data.............................................................................................................................................................33
Technical Considerations ..............................................................................................................................33
Features and Specifications ..........................................................................................................................33
M250 and M215 Features and Compliance.................................................................................................................33
M250-72 Specifications...............................................................................................................................................34
M250-60 Specifications...............................................................................................................................................35
M215-60-230-S25E and -S22E Specifications.............................................................................................................36
M215-60-230-S22 Specifications.................................................................................................................................37
Engage Cable Specifications.......................................................................................................................................38
Enphase Installation Map ..............................................................................................................................39
Sample Schematic –230 Vac, Single-Phase ................................................................................................40
Sample Schematic –230 Vac, Three-Phase.................................................................................................41

Enphase Microinverter Installation and Operation
2016 Enphase Energy. All rights reserved. 141-00024 Rev 02b
4
Important Safety Information
Read this First
This manual contains important instructions for use during installation and maintenance of the Enphase M215 and
M250 Microinverters™.
Product Labels
The following symbols appear on the product label and are described here:
WARNING: Hot surface.
DANGER: Risk of electric shock.
Refer to product instructions.
Safety and Advisory Symbols
To reduce the risk of electric shock, and to ensure the safe installation and operation of the Enphase® Microinverter,
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 particularly important for optimal system operation. Follow instructions
closely.
Safety Instructions
General Safety
CAUTION: Before installing or using the Enphase Microinverter, read all instructions and cautionary markings
in the technical description, on the Enphase Microinverter System, and on the photovoltaic (PV) equipment.
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.
DANGER: Risk of electric shock. Be aware that installation of this equipment includes risk of electric shock. Do
not install the AC junction box without first removing AC power from the Enphase System.
DANGER: Risk of electric shock. The DC conductors of this photovoltaic system are unearthed and may be
energised.
WARNING: Risk of electric shock. Always de-energise the AC branch circuit before servicing. Never
disconnect the DC connectors under load.
WARNING: Risk of electric shock. Risk of fire. Only use electrical system components approved for wet
locations.
WARNING: Risk of electric shock. Risk of fire. Only qualified personnel should troubleshoot, install, or replace
Enphase Microinverters or the Engage Cable and Accessories.
WARNING: Risk of electric shock. Risk of fire. Ensure that all AC and DC wiring is correct and that none of the
AC or DC wires are pinched or damaged. Ensure that all AC junction boxes are properly closed.
WARNING: Risk of electric shock. Risk of fire. 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 20A
maximum breaker.

M-Series Microinverter Installation and Operation
2016 Enphase Energy. All rights reserved. 141-00024 Rev 02b
5
WARNING: Do not connect Enphase Microinverters to the grid or energise the AC circuit(s) until
you have completed all of the installation procedures and have received prior approval from the
electrical utility company.
NOTE: To ensure optimal reliability and to meet warranty requirements, the Enphase Microinverter
System must be installed according to the instructions in this manual.
NOTE: The AC and DC connectors on the cabling are rated as a disconnect only when used with
an Enphase Microinverter.
NOTE: Protection against lightning and resulting voltage surge must be in accordance with local
standards.
NOTE: Many PV modules have a central stiffening brace. In these cases, do not position the
connector and microinverter at the exact centre of the PV module. Instead, position the drop
connectors so that the connectors do not conflict with the braces.
NOTE: Completely install all microinverters and all system AC connections prior to installing the
PV modules.
Microinverter Safety
WARNING: Risk of Skin Burn. The body of the Enphase Microinverter is the heat sink. Under
normal operating conditions, the temperature is 15°C above ambient, but under extreme
conditions the microinverter can reach a temperature of 80°C. To reduce risk of burns, use caution
when working with microinverters.
WARNING: Risk of electric shock. Risk of fire. If the AC cable on the microinverter is damaged, do
not install the unit.
WARNING: Risk of electric shock. Risk of fire. Do not attempt to repair the Enphase Microinverter;
it contains no user-serviceable parts. If it fails, contact Enphase customer service to obtain an
RMA (return merchandise authorization) number and start the replacement process. Tampering
with or opening the Enphase Microinverter will void the 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,
and non-Enphase batteries, etc. These devices do not behave like standard PV modules, so
operation and compliance is not guaranteed. These devices may also damage the Enphase
Microinverter by exceeding its electrical rating, making the system potentially unsafe.
WARNING: Risk of Equipment Damage. 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. You must match the DC operating voltage range of the
PV module with the allowable input voltage range of the Enphase Microinverter.
WARNING: Risk of Equipment Damage. The maximum open circuit voltage of the PV module
must not exceed the specified maximum input DC voltage of the Enphase Microinverter.
WARNING: Risk of Equipment Damage. The microinverter must be installed under the module,
out of rain and sun. Do not mount the microinverter in a position that allows long-term exposure to
direct sunlight or in a vertical orientation that allows water to collect in the DC connector recess.
Do not install the microinverter black side up or vertically, with the DC connectors facing up.
WARNING: Be aware that only qualified personnel may connect the Enphase Microinverter to the
utility grid.
NOTE: Some Enphase Microinverter models will not produce power until the Envoy
Communications Gateway is installed and configured with an appropriate grid profile. For
instructions, refer to the Envoy Installation and Operation Manual at http://www.enphase.com.
NOTE: The Enphase Microinverter has field-adjustable voltage and frequency trip points that may
need to be set, depending upon local requirements. Only an authorised installer with the
permission and following requirements of the local electrical authorities should make adjustments.
NOTE: The Enphase Microinverter works with single-phase or three-phase electrical service.

Enphase Microinverter Installation and Operation
2016 Enphase Energy. All rights reserved. 141-00024 Rev 02b
6
Engage Cable and Accessory Safety
DANGER: Risk of electric shock. The Engage Cable terminator cap must not be installed while
power is connected.
WARNING: Risk of electric shock. Risk of fire. When stripping the sheath from the Engage Cable,
make sure the conductors are not damaged. If the exposed wires are damaged, the system may
not function properly.
WARNING: Risk of electric shock. Risk of fire. Do not leave AC connectors on the Engage Cable
uncovered for an extended period. If you do not replace the microinverter immediately, you must
cover any unused connector with a sealing cap. Sealing caps may not be reused.
WARNING: Risk of electric shock. Risk of fire. Make sure protective sealing caps have been
installed on all unused AC connectors. Unused AC connectors are live when the system is
energised by the grid. Sealing caps may not be reused.
WARNING: Risk of electric shock. Treat all connector contacts as though they are live. The 400
Vac Engage Cable drop connector contains two live phases.
WARNING: Use the terminator only once. If you open the terminator following installation, the
latching mechanism is destroyed. Do not reuse the terminator. Do not circumvent or manipulate
the latching mechanism.
CAUTION: When installing the Engage Cable, secure any loose cable to minimise tripping hazard.
NOTE: Check the labelling on the Engage Cable drop connectors to be sure that the cable
matches the electrical utility service at the site. Use 400 Vac Engage Cable at sites with three-
phase service, or use 230 Vac Engage Cable at sites with single-phase service.
NOTE: There are two release-holes in the drop connector on the cable. These are not for
mounting but are used to disconnect the connector. Keep these release holes clear and
accessible.
NOTE: When looping the Engage Cable, do not form loops smaller than 12 cm in diameter.
NOTE: If you need to remove a sealing cap, you must use the Enphase disconnect tool or a
screwdriver. Sealing caps may not be reused.
NOTE: When installing the Engage Cable and accessories, adhere to the following:
Do not expose the terminator cap or cable connections to directed, pressurised liquid
(water jets, etc.).
Do not expose the terminator cap or cable connections to continuous immersion.
Do not expose the terminator cap or cable connections to continuous tension (e.g.,
tension due to pulling or bending the cable near the connection).
Use only the connectors and cables provided.
Do not allow contamination or debris in the connectors.
Use the 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 terminator to come into contact with open flame.
Make sure that all terminator cap seals are seated correctly in the wire organiser.
Fit the terminator cap using only the prescribed tools and in the prescribed manner.
Use the terminator to seal the conductor end of the Engage Cable; no other method is
allowed.
NOTE: Do not use the shipping cap to cover unused connectors. The shipping cap does not
provide an adequate environmental seal. Enphase sealing caps are required to protect against
moisture ingress.

M-Series Microinverter Installation and Operation
2016 Enphase Energy. All rights reserved. 141-00024 Rev 02b
7
The Enphase Microinverter System
The Enphase Microinverter®System™ is the world’s most technologically advanced inverter system for
use in utility-interactive applications.
The three key elements of an Enphase Microinverter System include the:
Enphase Microinverter
Enphase Envoy®Communications Gateway™
Enphase Enlighten®web-based monitoring and analysis software
This integrated system maximises energy harvest, increases system reliability, and simplifies design,
installation and management.

Enphase Microinverter Installation and Operation
2016 Enphase Energy. All rights reserved. 141-00024 Rev 02b
8
How the Microinverter Works
The Enphase Microinverter maximises energy production from your photovoltaic (PV) array. Each
Enphase Microinverter is individually connected to one PV module in your array. This configuration
means that an individual Maximum Peak Power Point Tracker (MPPT) controls each PV module. This
ensures that the maximum power available from each PV module is exported to the electricity network
regardless of the performance of the other PV modules in the array. That is, although individual PV
modules in the array may be affected by shading, soiling, orientation, or PV module mismatch, the
Enphase Microinverter ensures top performance for its associated PV module. The result is maximum
energy production from your PV system.
System Monitoring
Once you install the Envoy Communications Gateway and provide an Ethernet connection to your
broadband router or modem, the Enphase Microinverters automatically begin reporting to the Enphase
Enlighten web server. The Enlighten software presents current and historical system performance trends,
and it informs you of PV system status.
Optimal Reliability
Microinverter systems are inherently more reliable than traditional 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 (150F).
The microinverter housing is designed for outdoor installation and complies with the IP67 regulation:
IP67 protective factor definition: Entirely protected against the effects of dust and
immersion.
NOTE: To ensure optimal reliability and to meet warranty requirements, the Enphase Microinverter must be
installed according to the instructions in this manual.
Ease of Design
PV systems using Enphase Microinverters are very simple to design and install. You will not need string
calculations, and you can install individual PV modules in any combination of PV module quantity, type,
age and orientation. You won’t need to install cumbersome traditional inverters. Each microinverter
quickly mounts on the mounting rail, directly beneath each PV module. Low voltage DC wires connect
from the PV module directly to the co-located microinverter, eliminating the risk of personnel exposure to
dangerously high DC voltage.

M-Series Microinverter Installation and Operation
2016 Enphase Energy. All rights reserved. 141-00024 Rev 02b
9
Planning for Microinverter Installation
Enphase Microinverters are compatible with many PV modules and install quickly and easily. They
include integrated DC and AC cables and connectors. The DC connectors attach to the PV module, while
the AC connector attaches directly to the Engage Cable. No additional cabling is needed.
The Engage Cable is available in multiple connector spacing options and two voltage types to meet
varying site requirements. For Engage Cable ordering information, see “Engage Cable Planning and
Ordering”on page 30.
WARNING: Be aware that installation of this equipment includes risk of electric shock. Normally earthed
conductors may be unearthed and energised when an earth fault is indicated.
Compatibility and Capacity
The Enphase M215 and M250 Microinverters are electrically compatible with many PV modules. For
more information, see Technical Data on page 33 of this manual.
Refer to the Enphase website (http://www.enphase.com/support) for a list of electrically compatible PV
modules and approved mounting rail systems. To ensure mechanical compatibility, be sure to order
the correct connector type for both microinverter and PV module from your distributor.
Compatibility
Model Number
DC Connector Type
Pre-set with a Grid Profile
Compatibility
M250-60-230-S25
M215-60-230-S25E
Amphenol H4 only
No
60-cell PV modules
M250-60-230-S22
M215-60-230-S22E
M215-60-230-S22
MC-4 Type 2 Locking
No
M250-60-230-S22-UK
MC-4 Type 2 Locking
Yes
M250-72-2LN-S2
MC-4 Type 2 Locking
No
60- and 72-cell PV
modules
M250-72-2LN-S5
Amphenol H4 only
No
M250-72-2LN-S2-UK
MC-4 Type 2 Locking
Yes
M250-72-2LN-S5-UK
Amphenol H4 only
Yes
Branch Circuit Capacity
Service type
Maximum M250s per AC
branch circuit
Maximum M215s per AC
branch circuit
230V single-phase
14
17
400V three-phase
24
27
400V three-phase, centre-fed*
42
51
* To centre-feed a branch, divide the circuit into two sub-branch circuits protected by a single overcurrent
protection device (OCPD).
Utility Service Requirements
The Enphase Microinverter works with single phase or three phase 230 Vac service. Measure AC line voltage at the electrical utility
connection to confirm that it is within the ranges shown:
Single-Phase Service
Three-Phase Service
L1 to neutral
207 to 253 Vac
L1 to L2 to L3
360 to 440 Vac
L1, L2, L3 to neutral
207 to 253 Vac

Enphase Microinverter Installation and Operation
2016 Enphase Energy. All rights reserved. 141-00024 Rev 02b
10
Lightning and Surge Suppression
Enphase Microinverters have integral surge protection, greater than most traditional 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, you must protect your system with lightning and/or surge
suppression devices according to local regulation. Install devices that adhere to local standards.
NOTE: Protection against lightning and resulting voltage surge must be in accordance with local standards.
Parts and Tools Required
In addition to the microinverters, PV modules, mounting rail, and associated hardware, you will need the
following.
Enphase Equipment
Enphase Envoy®Communications Gateway
BEST PRACTICE: Connect the Envoy before the solar installation is complete. When powered up and
connected for the first time, the Envoy may retrieve an automatic upgrade from Enphase. Because this
upgrade may take up to 20 minutes, connect the Envoy first (connect to both AC power and to the broadband
router) so that the upgrade completes well before the solar module installation is complete. For more
information, see the Envoy Communications Gateway Installation and Operation Manual.
Engage Cable, as needed. (See “Engage Cable Planning and Ordering”on page 30.)
NOTE: Order the correct Engage Cable type. Installers must order Engage Cable for either single-phase or
three-phase installations. Use 400 Vac Engage Cable at sites with three-phase service, or use 230 Vac
Engage Cable at sites with single-phase service. All drop connectors on the Engage Cable bear labels
indicating the cable voltage designation.
Sealing caps, as needed (for any unused drops on the Engage Cable)
Terminators, as needed (one needed at the end of each AC branch circuit)
Enphase disconnect tool (number 2 and 3 Phillips screwdrivers can be substituted)
Enphase phase coupler (needed for three phase installation)
Other Items
Outdoor-rated, weather-proof AC junction box(es)
Gland or strain relief fitting (one per AC junction box)
Bonding conductor, if required
Torque wrench, sockets, spanners for mounting hardware
Adjustable spanner or open-ended spanner (for terminators)
Tool for PV module locking connectors
Handheld mirror (to view indicator lights on the undersides of the microinverters)
Laptop or other device for Envoy set up

M-Series Microinverter Installation and Operation
2016 Enphase Energy. All rights reserved. 141-00024 Rev 02b
11
Example Single-Phase Design
The following installation diagram shows an example with four branches. The single-phase design shows
four centre-fed branches with 14 microinverters each. The PV modules are in landscape orientation.
Tables following the diagram list required and optional equipment for this example.

Enphase Microinverter Installation and Operation
2016 Enphase Energy. All rights reserved. 141-00024 Rev 02b
12
Enphase Items Needed for Example Design
Quantity
Description
Order Number
56
M215 or M250 Microinverters
See page 9 for model numbers
1 pack
Disconnect tool (each pack contains five tools)
ET-DISC-05
1 pack
Branch Terminator (each pack contains 10 terminators)
ET-TERM-10
1
Engage Cable
ET17-230-xxx or
ET21-230-192-2.5mm
(minimum 56 drops)
1 pack
Sealing caps (each pack contains 10 caps):
Required only if there are any unused connectors on the Engage
Cable; Unused connectors must be covered with this cap.
ET-SEAL-10
1
Envoy Communications Gateway
ENV-230
optional
Power line communication bridge pair
EPLC-02 (EU), EPLC-03 (UK)
or EPLC-04 (AU)
optional
Wireless N USB adapter (802.11b/g/n)
WF-01
Non-Enphase Items Needed for Example Design
Quantity
Description
56
60-cell PV modules
as needed
Tie wraps (cable ties)
4
Weather-proof junction box
4
20 amp circuit breaker single pole / Ph+N
1 (optional)
100 amp circuit breaker
1
100 amp load centre with 1 80 amp main breaker
as needed
Rail / mounting hardware
as needed
Lightning protection device
as needed
Homerun conductors
as needed
Continuous earthing conductor
as needed
Torque wrench, sockets, wrenches for mounting hardware
as needed
Adjustable wrench or open-ended wrench (for terminator caps)
as needed
Inspection mirror
(for viewing indicator lights on the undersides of the microinverters)

M-Series Microinverter Installation and Operation
2016 Enphase Energy. All rights reserved. 141-00024 Rev 02b
13
Enphase Microinverter Installation
Installing the Enphase Microinverter System involves several key steps. Each step listed below is
detailed in the following pages.
Step 1: Register the System
Step 2: Connect the Envoy®Communications Gateway™
Step 3: Position the Enphase Engage™Cable
Step 4: Install an AC Junction Box
Step 5: Attach the Microinverters to the Mounting Rail
Step 6: Dress the Engage Cable
Step 7: Connect the Microinverters
Step 8: Terminate the Unused End of the Engage Cable
Step 9: Connect the Engage Cable to AC Junction Box
Step 10: Complete the Installation Map
Step 11: Connect the PV Modules
WARNING: Risk of electric shock. Risk of fire. Always de-energise the AC branch circuit before servicing.
Never disconnect the DC connectors under load.
WARNING: DO NOT connect Enphase Microinverters to the electricity network or energise the AC circuit(s)
until you have completed all of the installation procedures as described in the following sections.
NOTE: Some Enphase Microinverters will not begin exporting power until the Envoy Communications Gateway
is installed and has detected all of the microinverters at the site. In addition, the grid profile must be configured
and the Envoy must have propagated these settings to the microinverters. For instructions on this procedure,
refer to the Envoy Installation and Operation Manual at http://www.enphase.com/support.

Enphase Microinverter Installation and Operation
2016 Enphase Energy. All rights reserved. 141-00024 Rev 02b
14
Step 1: Register the System
Register the Envoy at the beginning of the
PV installation.
a. Use your previously issued username
and password to log in to in Enlighten.
If you haven’t registered, go to
www.enphase.com and click Enlighten
Login.
b. At the installer dashboard, click Add a
New System.
If you have already registered the site,
find the system under Installations in
Progress.
c. Under System, enter the system Name,
Type and Installer Reference (optional).
d. Enter Installer information.
e. Under Owner, enter the Name, Email,
and Phone.
f. Under Location, enter the Country and
address information.
g. Under Envoy, select the Internet
Connection type and enter the Envoy
Serial Number.
h. Select the appropriate profile from the
Grid Profile menu.
NOTE: Some microinverters will
not export power until the Envoy
is installed and detects all the
microinverters at the site. The
grid profile must also be set and
propagated to the microinverters.
i. Under Modules, enter total number of
modules, type, etc.
j. Click Save to submit the form. You will
receive a confirmation message:
“Activation Created Successfully.”
For more information on Grid Profiles or if
you need to change the grid profile
subsequent to this initial procedure, see the
Envoy Communications Gateway
Installation and Operation Manual at:
http://www.enphase.com/support.

M-Series Microinverter Installation and Operation
2016 Enphase Energy. All rights reserved. 141-00024 Rev 02b
15
Step 2: Connect the Envoy Communications Gateway
The Envoy operates between the Enphase Microinverters and the Enphase Enlighten® web-based
monitoring and analysis software. The Envoy collects energy and performance data from the
microinverters over on-site AC power lines. It then forwards that data to Enlighten, via the Internet, for
statistical reporting. The Envoy is capable of monitoring up to 600 Enphase Microinverters.
a. Connect the Envoy to power and Internet according to the Envoy Quick Install Guide.
NOTE: If you are installing the Envoy (ENV-230) in a three-phase application, the power line
communication signal must be “coupled” between the three phases to allow the Envoy to
communicate with all of the microinverters in the system. Install a phase coupler, or wire a
capacitor into the system. With either solution, install the device on the load side of the over-
current protection device. See the Enphase Technical Brief on Phase Coupling for your
region at http://www.enphase.com/support.
b. During start up, the Envoy LCD panel scrolls through the available language settings. When
you see the setting you prefer, press the Menu button and hold for two seconds.
c. Wait for the “+Web” indication on the Envoy’s LCD screen.
d. Leave the Envoy running while you install the microinverters so that any required Envoy
software upgrade completes.
BEST PRACTICE: When powered up and connected for the first time, the Envoy may
retrieve an automatic upgrade from Enphase. Because this upgrade may take up to 20
minutes, connect the Envoy first at the site (connect to both AC power and the broadband
router) so that it performs the upgrade well before the solar module installation is complete.
WARNING! Do not remove power from the Envoy if the LCD displays:
“Upgrading. . . Do Not Unplug.”
broadband router
Envoy

Enphase Microinverter Installation and Operation
2016 Enphase Energy. All rights reserved. 141-00024 Rev 02b
16
Step 3: Position the Enphase Engage™Cable
The Engage Cable is a continuous length of outdoor rated cable with integrated connectors for
microinverters. These connectors are preinstalled along the Engage Cable at intervals to accommodate
PV module widths. The microinverters plug directly into the connectors, and the Engage Cable is
terminated into the junction box that feeds electricity back to the system AC disconnect. For more
information, see “Engage Cable Planning and Ordering”on page 30.
NOTE: Make sure you are using the correct cable type. Use 400 Vac Engage Cable at sites with three-
phase service, or use 230 Vac Engage Cable at sites with single-phase service. Check the labelling on the
drop connectors to verify the voltage type.
a. Plan the cable route so that the drop connectors on the Engage Cable align with each PV
module. Allow extra length for slack, cable turns and any obstructions.
b. Measure the path of the AC branch circuit and cut a length of Engage Cable to meet your
needs.
c. Lay the Engage Cable along the route it will travel, positioning the connectors so that they
align with the PV modules.
WARNING: Risk of fire. Plan the AC branches so that they do not exceed the maximum number of
microinverters in an AC branch circuit as listed on page 9 of this manual. You must protect each microinverter
AC branch circuit with a 20A maximum breaker.
NOTE: Many PV modules have a central stiffening brace. In these cases, do not position the connector and
microinverter at the exact centre of the PV module. Instead, position the drop connectors so that the
connectors do not conflict with the braces.
d. PV module widths vary by manufacturer. On the Engage Cable, connectors are spaced at
intervals to allow for the widest PV modules compatible with Enphase Microinverters. If
narrower PV modules are used, it may be necessary to account for excess cable by looping
the cable at suitable intervals.
NOTE: When looping the Engage Cable, do not form loops smaller than 12 cm in diameter.

M-Series Microinverter Installation and Operation
2016 Enphase Energy. All rights reserved. 141-00024 Rev 02b
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Step 4: Install an AC Junction Box
DANGER: Risk of electric shock. Be aware that installation of this equipment includes risk of electric shock. Do
not install the AC junction box without first removing AC power from the Enphase System.
WARNING: Only use electrical system components approved for wet locations.
WARNING: Do NOT exceed the maximum number of microinverters in an AC branch circuit as listed on page
9 of this manual.
a. Install an appropriate junction box at a suitable location on the mounting system. You can
centre feed the branch, or you can install the junction box at the end of a row of PV modules.
Best Practice: Centre-feed the branch circuit to minimise voltage rise in a fully-populated branch. This practice
greatly reduces the voltage rise as compared with an end-fed branch. To centre-feed a branch, divide the
circuit into two sub-branch circuits protected by a single overcurrent protection device (OCPD).
b. Size the AC cable/wire size to account for voltage drop. Select conductor diameter based on
the distance from the beginning of the microinverter AC branch circuit to the breaker in the
AC mains.
All components of system wiring must be considered, including internal voltage drop within
the length of Engage Cable. Typically, three wire sections and several wire terminations
must be quantified. There is also some resistance associated with each circuit breaker. As
all of these resistances are in series, they add together. Since the same current is flowing
through each resistance, the total voltage drop is total current times the total resistance. For
a single-phase system, the total resistance is equal to two times the one-way resistance. For
a three-phase system, each of the three line currents and resistances must be calculated.
Standard guidelines for voltage drop on feeder and AC branch circuit conductors might not
be sufficient for microinverter AC branch circuits that contain the maximum allowable
microinverters. This is due to high inherent voltage rise on the AC branch circuit.
For more information,refer to our Technical Briefs on Voltage Drop at
http://www.enphase.com/support.
c. Provide an AC connection from the AC junction box back to the electricity network
connection using equipment and practices as required by local regulations.

Enphase Microinverter Installation and Operation
2016 Enphase Energy. All rights reserved. 141-00024 Rev 02b
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Step 5: Attach the Microinverters to the Mounting Rail
a. Mark the approximate centres of each PV module on the mounting rail.
b. Evaluate the location of the microinverter with respect to the PV module DC junction box or
any other obstructions.
c. Ensure that the microinverter does not interfere with the PV module frame or stiffening
braces.
d. Ensure that the connector from the microinverter can easily reach the connector on the
Engage Cable.
e. Allow a minimum of 1.9 cm (0.75 inches) between the roof and the bottom of the
microinverter. Also allow 1.3 cm (0.50 inches) between the back of the PV module and the
top of the microinverter.
WARNING: Risk of equipment damage. You must install the microinverter under the module, out of rain and
sun. Do not mount the microinverter in a position that allows long-term exposure to direct sunlight or in a
vertical orientation that allows water to collect in the DC connector recess. Do not install the microinverter
black-side up or vertically, with the DC connectors facing up.
f. Mount one microinverter at each location using suitable hardware. The indicator light on the
underside of the microinverter will be facing the roof.
NOTE: Installing the microinverter black side up or
vertically, with the DC connectors facing up, is not
permitted.
g. Torque the microinverter fasteners to the
values shown. Do not over torque.
6 mm (1/4”) mounting hardware – 5 Nm
(45 to 50 in-lbs)
8 mm (5/16”) mounting hardware – 9 Nm
(80 to 85 in-lbs)
NOTE: Using a power screwdriver to
tighten the screws is not recommended
due to the risk of thread galling.
h. If you are using an earth bonding conductor to bond the microinverter chassis, attach the
bonding conductor to the microinverter bonding screw.
i. Torque the bonding screw as follows:
Model number
Torque value
M250-60-230-S25 and -S25E
M250-60-230-S22 and -S22E
M250-60-230-S22-UK
M250-72-2LN-S2 and -S2-UK
M250-72-2LN-S5 and -S5-UK
4 to 5 Nm
M215-60-230-S22
2 Nm
Do not over torque. You may also earth the mounting rail and PV module to this conductor
using a crimp connection.
NOTE: The AC output neutral is not bonded to earth inside the microinverter.

M-Series Microinverter Installation and Operation
2016 Enphase Energy. All rights reserved. 141-00024 Rev 02b
19
Step 6: Dress the Engage Cable
NOTE: Adhere to the following requirements:
Do not expose the cable connections to directed, pressurised liquid (water jets, etc.).
Do not expose the cable connections to continuous immersion.
Do not expose the AC connector to continuous tension (e.g., tension due to pulling
or bending the cable near the connection)
Use only the connectors and cables provided.
Do not allow contamination or debris in the connectors.
Use the cable and connectors only when all parts are present and intact.
a. Attach the Engage Cable to the mounting rail using tie wraps.
NOTE: There are two release-holes in the drop connector on the cable. These are not
for mounting but are used to disconnect the connector. Keep these release holes clear
and accessible.
b. Dress any excess in loops so that the Engage Cable does not contact the roof.
There are several ways to support the cable. One method is to place tie wraps on either side
of the connector. Use tie wraps, or other support scheme to secure the cable between
connectors.
NOTE: When looping the Engage Cable, do not form loops smaller than 12 cm in
diameter.
CAUTION: Tripping Hazard. Loose cables can become a tripping hazard. Dress the
Engage Cable to minimise this potential.
release holes

Enphase Microinverter Installation and Operation
2016 Enphase Energy. All rights reserved. 141-00024 Rev 02b
20
Step 7: Connect the Microinverters
a. Remove and discard the temporary shipping cap from
the Engage Cable and connect the microinverter. There
are two latching mechanisms within the connectors.
Listen for two clicks as the connectors engage. Ensure
that both latching mechanisms have engaged.
b. Repeat for all microinverters in the AC branch circuit.
c. Cover any unused connector with a sealing cap. Listen
for two clicks as the connectors engage. Ensure
that both latching mechanisms have engaged.
NOTE: Do not use the shipping cap to cover unused
connectors. The shipping cap does not provide an
adequate environmental seal. Enphase sealing caps are
required for the system to compliant to regulation and to
protect against moisture ingress.
Enphase sealing caps are IP67 rated. Within the term
“IP67”, “IP” indicates an Ingress Protection (IP) rating against dust and liquids. This specific rating of IP67
indicates that this connector protects against all dust particles and immersion in liquid.
WARNING: Risk of electric shock. Risk of fire. Make sure protective sealing caps have been installed on all
unused AC connectors. Unused AC connectors are live when the system is energised by the electricity
network. Sealing caps may not be reused.
NOTE: If you need to remove a sealing cap, you must use the Enphase disconnect tool or a screwdriver. See
“Disconnect a Microinverter” on page 28. Sealing caps may not be reused.