Q U I C K I N S T A L L G U I D E
Installing
Enphase M250
and
M215
Microinverters
To install the Enphase M250 and M215 Microinverters™ read and follow all warnings and instructions in this guide and in the
Enphase M250 and M215
Microinverter Installation and Operation Manual
at:
enphase.com/support
. Safety warnings are listed on the back of this guide.
Because ground fault protection (GFP) is integrated into the M250 and M215 microinverters, the models listed in this guide do not require a grounding elec-
trode conductor (GEC) between microinverters. To support GFP, use only PV modules equipped with DC cables labeled
PV Wire
or
PV Cable
.
D ) Check that you have these
other items
:
•
Outdoor-rated, weather-proof AC junction box(es)
•
Gland or strain relief fitting (one per AC junction box)
•
Number 2 and 3 Phillips screwdrivers
•
Torque wrench, sockets, wrenches for mounting hardware
•
Adjustable wrench or open-ended wrench (for terminators)
•
Hand-held mirror (to view LEDs on the undersides of the
microinverters)
E ) Protect your system with lightning and/or surge suppression devices. It
is also important to have insurance that protects against lightning and
electrical surges.
F ) Plan your AC branch circuits to meet the following limits for maximum
number of microinverters per branch when protected with a 20-amp
maximum over-current protection device (OCPD).
Service type
Max. M250s per
branch circuit
Max. M215s per
branch circuit
Single-phase 240 VAC 16
17
Three-phase 208 VAC 24
25
G ) Size the AC wire gauge to account for voltage rise. Select the correct
wire size based on the distance from the beginning of the microinverter
AC branch circuit to the breaker in the load center. Design for a voltage
rise total of less than 2% for the sections from the microinverter AC
branch circuit to the breaker in the load center. Refer to the Voltage Rise
Technical Brief at
enphase.com/support
for more information.
Best practice:
Center-feed the branch circuit to minimize voltage rise in
a fully-populated branch.
PREPARATION
A ) Download the Enphase Installer Toolkit™ mobile app and
open it to log in to your Enlighten account. With this app,
you can scan microinverter serial numbers and connect
to the Envoy-S to track system installation progress. To
download, go to
enphase.com/toolkit
or scan the QR code at right.
B ) Refer to the following table and check PV module electrical compatibility
at:
enphase.com/en-us/support/module-compatibility.
Microinverter model
PV module cell count
M215-60-2LL-S22-IG
M250-60-2LL-S22
M250-60-2LL-S25
Pair only with 60-cell modules.
M250-72-2LL-S22
M250-72-2LL-S25
M250-72-2LL-S22-US
Pair with 60- or 72-cell modules.
To ensure mechanical compatibility, order the correct connector type
(MC-4 locking or Amphenol H4) for both microinverter and PV module
from your distributor.
C ) In addition to the Enphase Microinverters, PV modules and racking, you
will need these
Enphase items
:
•
Enphase Envoy or Envoy-S™ communications gateway (required to
monitor solar production)
•
Enphase Engage Cable™, single-phase 240 VAC or three-phase 208
VAC, as needed
•
Tie wraps or cable clips
•
Enphase Sealing Caps (for any unused drops on the Engage Cable)
•
Enphase Terminators (one needed at the end of each AC branch
circuit)
•
Enphase Disconnect Tool (number 2 and 3 Phillips screwdrivers can
be substituted)
AC connector
Enphase
Microinverter
DC
connectors
AC
junction box
terminator
Engage
Cable
Tie wraps or
cable clips
AC drop on
Engage Cable
How It Fits Together
© Enphase Energy, Inc. All rights reserved.
