Step 5: Attach The Microinverters To The Mounting Rail - enphase M250 Installation And Operation Manual

Enphase Microinverter Installation and Operation

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
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
M215-60-230-S22
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.
18
Torque value
4 to 5 Nm
2 Nm
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141-00024 Rev 02b