IQ 7 / IQ 7+ / IQ 7X / IQ 7A with EN4 Bulkhead Installation and Operation
© 2020 Enphase Energy Inc. All rights reserved.
141-00047-01
25
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. Make sure 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. Make sure 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 AC line voltage at the junction box for each AC branch circuit is within the ranges
shown in the following table:
240 Volt AC, Single Phase
L1 to L2
211 to 264 VAC
L1, L2 to ground
106 to 132 VAC
208 Volt AC, Single Phase
L1 to L2
183 to 229 VAC
L1, L2 to ground
106 to 132 VAC
E. Using an Enphase disconnect tool, disconnect the AC cable for the microinverter in question
from the Enphase Q Cable.
F. Verify that utility power is present at the microinverter by measuring line to line and line to
ground at the Enphase Q Cable connector.
G. Visually check that the AC branch circuit connections (Enphase Q Cable and AC
connections) are properly seated. Reseat if necessary. Check also for damage, such as
rodent damage.
H. Make sure 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 page 23 for normal LED operation.
J. Attach an ammeter clamp to one conductor of the DC cables from the PV module to measure
microinverter current. This will be under one amp if AC is disconnected.
K. Verify the PV module DC voltage is within the allowable range shown in
page 32 of this manual.
L. Swap DC leads with a known good, adjacent PV module. If after checking Enlighten
periodically (this may take up to 30 minutes), the problem moves to the adjacent module, this
indicates that the PV module isn’t functioning correctly. If it stays in place, the problem is with
the original microinverter. Contact
microinverter data and for help in obtaining a replacement microinverter, if needed.
