Troubleshoot An Inoperable Microinverter - enphase IQ7 Installation And Operation Manual

4.2 Troubleshoot an inoperable microinverter

To troubleshoot an inoperable microinverter, follow the steps in the order shown.
WARNING: Risk of electric shock. Always de-energize the AC branch circuit before
servicing. Never disconnect the DC connectors under load.
WARNING: The Enphase microinverters are powered by DC power from the PV
modules. Ensure you disconnect the DC connections and reconnect DC power, and
then watch for the solid green about six seconds after connection to DC power.
A. Ensure AC breakers and disconnects are closed.
B. Check the connection to the utility grid and verify that the utility voltage is within
allowable ranges.
C. Verify that AC line voltages at all solar power circuit breakers at the load center and
subpanels are within the ranges shown in the following table.
D. Verify that the AC line voltage at the junction box for each AC branch circuit is within the
ranges shown in the following table:
E. Using an Enphase disconnect tool, disconnect the AC cable for the microinverter in
question from the IQ Cable.
F. Verify that utility power is present at the microinverter by measuring line to line and line to
ground at the IQ Cable connector.
G. Visually check that the AC branch circuit connections (IQ Cable and AC connections) are
properly seated. Reseat if necessary. Check also for damage, such as rodent damage.
H. Ensure that any upstream AC disconnects, as well as the dedicated circuit breakers for
each AC branch circuit, are functioning properly and are closed.
I. Using the Enphase disconnect tool, disconnect and re-connect the DC PV module
connectors. The status LED of each microinverter will light solid green a few seconds
after connection to DC power and then blink green six times to indicate normal start-up
operation about two minutes after connecting to DC power. The LED subsequently
resumes normal operation if the grid is present. See
operation.
J. Attach an ammeter clamp to one conductor of the DC cables from the PV module to
measure the microinverter current. This will be under one amp if the AC is disconnected.
K. Verify the PV module DC voltage is within the allowable range shown in Specifications.
L. Swap DC leads with a known good, adjacent PV module. If, after checking the Enphase
Installer Portal periodically (this may take up to 30 minutes), the problem moves to the
adjacent module, this indicates that the PV module is not functioning correctly. If it stays
in place, the problem is with the original microinverter. Contact
microinverter data and for obtaining a replacement microinverter, if needed.
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IQ7/IQ7+/IQ7X/IQ7A Microinverters Installation and Operation Manual
240 VAC, single phase
L1 to L2
L1, L2 to ground
208 VAC, single phase
L1 to L2
L1, L2 to ground
© 2023 Enphase Energy Inc. All rights reserved.
211 to 264 VAC
106 to 132 VAC
183 to 229 VAC
106 to 132 VAC
LED operation for normal LED
Enphase Support for the
September 2023
IOM-00028-1.0