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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 or AC 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 the DC power and then
watch for the solid green for about six seconds after connection to DC power.
A. Make sure AC circuit breakers and isolator switches are closed.
B. Check the connection to the grid and verify that the grid voltage is within allowable ranges.
C. Verify that AC line voltages at all PV circuit breakers at the electrical panel and sub-panels
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:
Single-phase service
L1 to N
184 to 276 VAC
*Nominal voltage range can be extended beyond nominal if required by the electricity network operator.
E. Using an IQ Disconnect Tool, disconnect the AC cable for the microinverter in question from
the IQ Cable.
F. Verify that the grid is present at the microinverter by measuring line-to-line voltage and
the line-to-ground voltage at the IQ Cable connector.
G. Visually check that the AC branch circuit connections (IQ Cable and AC connections) are
properly seated. Reset if necessary. Check for any 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.
Disconnect and re-connect the DC PV module connectors. The status LED of each
microinverter will light solid green for a few seconds after connection to DC power and then
flash 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
LED operation
J. Connect a clamp meter to one of the conductors of the DC cables from the PV module to the
measure microinverter current. This will be under 1 A if AC is disconnected.
K. Verify the PV module DC voltage is within the allowable range shown in "Specifications".
Refer to the Enphase compatibility calculator at:
za/installers/microinverters/calculator
microinverter.
L. Swap DC leads with a known good, adjacent PV module. If after checking the Enphase
Installer Platform 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
help in reading the microinverter data and for help in obtaining a replacement microinverter,
if needed.
23
IQ8P Microinverter Installation and Operation Manual
L1 to L2 to L3
L1, L2, L3 to N
for normal LED operation.
to verify PV module electrical compatibility with the
© 2023 Enphase Energy Inc. All rights reserved.
Three-phase service
319 to 478 VAC*
184 to 276 VAC*
https://enphase.com/en-
Enphase customer support
for
September 2023
IOM-00001-1.0
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