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Install a Replacement Microinverter
If problems remain after troubleshooting, contact Enphase at support@enphaseenergy.com. If Enphase
authorizes a replacement (RMA), replace the microinverter as follows:
1. When the replacement M250 is available, verify that the AC branch circuit breaker is de-
energized.
2. Attach the replacement microinverter to the PV racking using hardware recommended by
your PV racking vendor.
WARNING: You must install the M250 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.
3. Torque the microinverter fasteners to the values shown. Do not over torque.
6 mm (1/4") mounting hardware: 5 N m (45 to 50 in-lbs)
8 mm (5/16") mounting hardware: 9 N m (80 to 85 in-lbs)
NOTE: Using a power screwdriver to tighten the fasteners is not recommended due to
the risk of thread galling.
4. Connect the microinverter to the Engage Cable drop connector. There are two latching
mechanisms within the connectors. Listen for two clicks as the connectors engage. Ensure
that both latching mechanisms have engaged.
5. Mount the PV module above the microinverter.
6. Mate the microinverter and PV module as required.
7. Energize the AC branch circuit breaker, and verify operation of the replacement microinverter
by checking the indicator light on the underside of the microinverter. You may need a
handheld mirror to see the indicator light.
8. Initiate a device scan at the Envoy. To do this, press and hold the Menu button on the Envoy
for two seconds to bring up the Envoy menu on the LCD window. When the LCD window
displays "Enable Device Scan", release the Menu button. This starts a 30-minute scan at the
Envoy to discover the new microinverter.
9. Use Enlighten's Array Builder to add the newly detected microinverter to the virtual array.
10. Ship the old microinverter to Enphase using the supplied return-shipping label.
25
2013 Enphase Energy Inc.
M250 Installation and Operation
141-00022 Rev 01
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