M250 SAFETY
M250 (M250-60-2LL) Safety
Important Safety Information
This document contains important instructions to use during installation of the Enphase M250 Microinverter™. To reduce
the risk of electrical shock, and to ensure the safe installation and operation of the Enphase Microinverter, follow these instructions. The following safety symbols and information indicate dangerous conditions and important safety instructions.
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Product Labels
WARNING: Hot surface.
DANGER: Risk of electrical shock.
Refer to product instructions.
Safety Instructions
DANGER: Before installing or using the Enphase Micro-
inverter, read all instructions and cautionary markings in
the technical description, on the Enphase Microinverter
System, and on the photovoltaic (PV) equipment.
DANGER: Do not use Enphase equipment in a manner
not specied by the manufacturer. Doing so may cause
death or injury to persons, or damage to equipment.
DANGER: Risk of Electrical Shock. Be aware that installation of this equipment includes risk of electric shock.
Do not install the AC junction box without rst removing
AC power from the Enphase System.
DANGER: The Engage Cable terminator cap must not
be installed while power is connected.
DANGER: Electric shock hazard. The DC conductors
of this photovoltaic system are ungrounded and may be
energized.
WARNING: Always de-energize the AC branch circuit
before servicing. Never disconnect the DC connec-
tors under load. Disconnect DC connections rst, then
disconnect AC connections.
WARNING: 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: The M250 may be paired only with a 60-cell
PV module. The PV module DC conductors must be la-
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beled “PV Wire” or “PV Cable” to be compliant with NEC
690.35(D) for Ungrounded PV Power Systems.
Safety and Advisory Symbols
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
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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.
WARNING: If the AC cable on the microinverter is damaged, do not install the unit.
WARNING: You must match the DC operating voltage
range of the PV module with the allowable input voltage
range of the Enphase Microinverter: 16-48V.
WARNING: The maximum open circuit voltage of the PV
module must not exceed the specied maximum input
voltage of the Enphase Microinverter: 48V DC.
WARNING: The M250 has eld-adjustable voltage and
frequency trip points that you may need to set, depending upon local requirements. Only an authorized installer
with the permission and following requirements of the
local electrical authorities should make adjustments.
WARNING: Only use electrical system components approved for wet locations.
WARNING: Only qualied personnel should trouble-
shoot, install, or replace Enphase Microinverters or the
Engage Cable and Accessories.
WARNING: Make sure protective sealing caps have
been installed on all unused AC connectors. Unused AC
connectors are live when the system is energized by the
grid. Sealing caps may not be reused.
WARNING: 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: The microinverter must be installed under
the module, out of rain and sun. Do not mount the micro-
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inverter 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: When installing the Engage Cable, secure
any loose cable to minimize tripping hazard.
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WARNING: Do not leave AC connectors on the Engage
Cable uncovered for an extended period. If you do not
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plan to replace the microinverter immediately, you must
cover any unused connector with a sealing cap. Sealing
caps may not be reused.
WARNING: Do not exceed the maximum number of
microinverters in an AC branch circuit as listed in the
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manual. You must protect each microinverter AC branch
circuit with a 20A maximum breaker.
WARNING: Do not connect Enphase Microinverters to
the grid or energize the AC circuit(s) until you have com-
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pleted all of the installation procedures and have received
prior approval from the electrical utility company.
WARNING: Do not attempt to repair the Enphase Microinverter; it contains no user-serviceable parts. If it fails,
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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: Be aware that only qualied personnel must
connect the Enphase Microinverter to the utility grid.
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WARNING: The Engage Cable terminator cap is
intended for one-time use only. If you open the termina-
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tor after initial installation, the latching mechanism is
destroyed and the terminator cap cannot be used again.
If the latching mechanism is defective, the terminator
must not be used. The latching mechanism must not be
circumvented or manipulated.
WARNING: When stripping the sheath from the Engage
Cable, make sure that the conductors are not damaged.
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If the exposed wires are damaged, the system may not
function properly.
WARNING: Perform all electrical installations in accordance with all applicable local electrical codes and the
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National Electrical Code (NEC), ANSI/NFPA 70.
NOTE: Check the labeling on the Engage Cable drop
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connectors to be sure that the cable matches the electrical utility service at the site. Use 208 VAC (208 VAC
three-phase) Engage Cable at sites with three-phase 208
VAC service, or use 240 VAC Engage Cable at sites with
240 VAC single-phase service.
NOTE: There are two release-holes in the drop con-
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nector on the cable. These are not for mounting but are
used to disconnect the connector. Keep these release
holes clear and accessible.
NOTE: Protection against lightning and resulting voltage
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surge must be in accordance with local standards.
NOTE: Many PV modules have a central stiffening brace.
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In these cases, do not position the connector and microinverter at the exact center of the PV module. Instead,
position the drop connectors so that the connectors do
not conict with the braces.
NOTE: If you need to remove a sealing cap, you must
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use the Enphase disconnect tool or a #3 Phillips screwdriver. Sealing caps may not be reused.
NOTE: The M250 works with 240 VAC single-phase util-
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ity service or with 208 VAC three-phase utility service
NOTE: When installing the Engage Cable and accesso-
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ries, adhere to the following:
• Do not expose the connection to directed, pressurized
liquid (water jets, etc.).
• Do not expose the connection 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.
• Fit the connections using only the prescribed tools.
• 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
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connectors. The shipping cap does not provide an
adequate environmental seal. Enphase sealing caps
are required for the system to be UL compliant and to
protect against moisture ingress.
NOTE: Completely install all microinverters and all sys-
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tem AC connections prior to installing the PV modules.
Installation Map
You can build the system map manually, or you can use the
ArrayGun feature from the Enphase Installer Toolkit to easily
build and congure a system. For more information, refer to
http://enphase.com/products/arraygun.
To manually build the Installation Map:
• Peel the removable serial number label from each
microinverter and afx it to the respective location on the
installation map.
• Peel the label from the Envoy and afx it to the installation
map.
• Log in to Enlighten.
• Scan the installation map and upload it to the System
Activation form online.
• Use Array Builder to create the virtual array using the
installation map as your reference.
• To see the Array Builder demo, refer to
http://enphase.com/support/videos.
N S E W
(circle one)
To Sheet: ________
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REVISION:
140-00003
DOCUMENT NUMBER:
INSTALLATION MAP
Installer information:Customer information:
To Sheet: ________
ENPHASEENERGY.COM
Envoy Serial Label
To Sheet: ________
Panel Group:
Azimuth:
Tilt:
1 2 3 4 5 6 7
sheet _____ of _____
A
B
C
D
E
F
G
H
J
To Sheet: ________
K
L
M
Scan completed map and upload it to Enphase. Click
“Add New System” at www.enlighten.enphaseenergy.com.
Use this map to build the virtual array in Enlighten’s Array Builder.
M250 QUICK INSTALL GUIDE
Installing the M250 Microinverter (M250-60-2LL)
NOTE: The M250 meets the requirements of NEC 690.35. Because the DC circuit is isolated and insulated from
ground, the M250 does not require that you install a GEC between microinverters. To support this feature, the
PV module must be equipped with DC cables labeled “PV Wire” or “PV Cable.”
Read the included safety information and follow all warnings and instructions in the M250 Installation and Operation
Manual at http://www.enphase.com/support before installing the Enphase M250™ Microinverter.
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2
Connect the Envoy® Communications Gateway™
a. Connect the Envoy to power and Internet according to the Envoy Quick
Install Guide.
b. Look for the + Web indication on the LCD screen.
c. Leave the Envoy running while you install the microinverters
so that any required
Envoy software upgrade completes.
Warning: Do not remove power from
the Envoy if the LCD displays:
“Upgrading. . . Do Not Unplug.”
Position the Enphase Engage™ Cable
a. Lay out the cabling along the installed racking for the AC branch circuit.
b. Install an appropriately rated, off-the-shelf junction box at a
suitable location on the racking.
See notes in Step Details on back.
Envoy
AC power
cord
broadband
router
Ethernet cable
terminator
Engage
Cable
drop
connector
AC junction
box
cable ties
connects to drop
connector
M250
DC connectors
Check the drop connector labels to
be sure that you have the right cable.
You must use 240 VAC cable for single-phase
or 208 VAC cable for three-phase.
M250 Microinverter Quick Install Guide
3
Attach the Microinverters to the PV Racking
a. Mark the approximate centers of each PV
module on the PV racking. See notes in Step
Details on back.
b. Mount the microinverter under the PV mod-
ule, away from 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.
c. Torque the microinverter fasteners as follows. Do
not over torque:
• 5 N m (45-50 in-lbs) for 6 mm (1/4”) hardware
• 9 N m (80-85 in-lbs) for 8 mm (5/16”) hardware
NOTE: The M250 meets the requirements
of NEC 690.35. Because the DC circuit is
isolated and insulated from ground, the M250
does not require a GEC. For further informa-
tion, refer to: http://enphase.com/global/les/
M250-and-Ungrounded-Array.pdf.
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Connect the Microinverters
a. Remove and discard the temporary shipping
cap from the cable connector and connect the
microinverter. Listen for two clicks as the
connectors engage.
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Dress the Cable
a. Attach the cabling to the rack using cable clips
or tie wraps.
cable clip
release holes
Keep the drop
connector
release holes
clear and
accessible.
b. Dress any excess cabling in loops so that it does
not contact the roof.
b. Cover any unused connectors with sealing
caps. Listen for two clicks as the connectors
engage. See notes in Step Details on back.
Do not use shipping caps to cover
unused connectors. The shipping cap
does not provide an adequate
environmental seal.
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Terminate the Unused End of the Cable
a. Remove 60 mm (2.5”) of the cable sheath from
the conductors.
b. Check that all terminator parts are present.
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Connect the Cable to the AC Junction Box
Connect the cable into the AC branch circuit
junction box. See notes in Step Details on
back.
hex
nut
c. Slide the hex nut onto the cable.
d. Insert the cable end all the way into the wire
organizer (up to the stop).
e. Attach the cap.
wire
organizer
bend wires down
into recesses of wire
organizer and trim to
length
cap
place cap over
the wire organizer
hold the cap
with the disconnect tool or a #2
screwdriver
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Complete the Installation Map
Build the map manually, or use the Array Gun tool
to map the system. For more information, go to
http://enphase.com/products/arraygun.
To manually build the map, peel the removable se-
rial number label from each microinverter and afx
it to the respective location on the map included
with this guide.
serial
number
labels
Connect the PV Modules
a. Mount the 60-cell PV modules above the micro-
inverters.
rotate the hex nut
with your hand or
a wrench until the
latching mechanism
meets the base–
do not over torque
f. Attach the terminated cable end to the PV
racking with a cable clip or tie wrap.
Never unscrew the hex nut. This action
can twist and damage the cable.
b. Connect the DC leads of each 60-cell PV mod-
ule to the DC input connectors of their corresponding microinverter.
The status LED on the underside of each M250
lights green six seconds after DC power is
applied. It remains lit solid for two minutes, followed by six green blinks. After that, red blinks
indicate that no grid is present. This is because
the system is not yet energized.
status LED
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Energize the System
a. If applicable, turn ON the AC disconnect or circuit
breaker for the branch circuit.
b. Turn ON the main utility-grid AC circuit breaker.
Your system will start producing power after a
ve-minute wait time.
Use the Envoy to Complete System Setup
Refer to the to the Envoy Quick Install Guide for
details on the following steps:
a. An automatic device scan runs for eight hours af-
ter the Envoy is installed. If this scan has expired,
start a new scan:
• Press and hold the Envoy menu button (on the
right side of the Envoy).
• Release the menu button when the LCD screen
displays Enable Device Scan.
b. Check that the LCD shows a
complete device count after
about 30 minutes.
c. Use the Envoy menu button
to select Enable Commu-
nication Check. Ensure at
least three level bars show
on the LCD.
d. When all devices are de-
tected, stop the scan. To do
this, use the Envoy menu
button to select Disable
Device Scan.
Envoy menu
button
(rear view)
Step Details
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NOTE: Verify that AC voltage at the site is within range:
240 Volt AC Single-Phase 208 Volt AC Three-Phase
L1 to L2 211 to 264 VAC L1 to L2 to L3 183 to 229 VAC
L1, L2, to N 106 to 132 VAC L1, L2, L3 to N 106 to 132 VAC
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 in the table below. Each
branch circuit must be protected by a dedicated circuit breaker
of 20 A or less.
Service type Max M250s per branch
240 VAC single-phase 16
208 VAC three-phase 24
WARNING: Size the AC wire gauge to account for voltage drop
for both the branch circuit and all upstream conductors leading back to the PCC. See Circuit Calculations for M250 at
http://www.enphase.com/support.
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DANGER: ELECTRIC SHOCK HAZARD. THE DC
CONDUCTORS OF THIS PHOTOVOLTAIC SYSTEM ARE
UNGROUNDED AND MAY BE ENERGIZED.
WARNING: Allow a minimum of 1.9 cm (0.75”) between the
roof and the microinverter. Also allow 1.3 cm (0.50”) between
the back of the PV module and the top of the microinverter.
NOTE: Torque the microinverter fasteners to the values shown.
Do not over torque:
• 1/4” mounting hardware – 5 N m (45-50 in-lbs)
• 5/16” mounting hardware – 9 N m (80-85 in-lbs)
Using a power screwdriver is not recommended due to the risk
of thread galling.
NOTE: The AC output neutral is not bonded to ground inside
the microinverter.
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WARNING: Install sealing caps on all unused AC connectors
as these become live when the system is
energized by the utility. The IP67-rated
sealing caps are required for
protection against moisture ingress.
NOTE: To remove a sealing cap, you
must use the Enphase disconnect tool or
a #3 Phillips screwdriver.
disconnect
tool
Enphase Energy, Inc.
1420 N. McDowell Blvd.
Petaluma, CA 94954
USA
info@enphaseenergy.com
http://www.enphase.com
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NOTE: The Engage Cable uses the following wiring scheme.
240 Volt AC Single-Phase Wires 208 Volt AC Three-Phase Wires
Black – L1
Red – L2
White – Neutral
Green – Ground
NOTE: The green wire acts as equipment ground (EGC).
© 2013 Enphase Energy Inc. All rights reserved.
Black – L1
Red – L2
Blue – L3
White – Neutral
Green – Ground
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