Table of Contents
Advertisement
Other faults
All other faults are reported to the gateway. Refer to the IQ Gateway Installation and Operation Manual at
https://enphase.com/installers/resources/documentation
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 disconnects 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.
** Only IQ8HC supports 220 V Grid in Mexico.
D.
Using an IQ Disconnect Tool, disconnect the AC cable for the microinverter in question from the IQ Cable.
E.
Verify that utility power is present at the microinverter by measuring line-to-line and line-to-ground voltage at
the IQ Cable connector.
F.
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.
G. 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.
H.
Disconnect and reconnect 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
startup operation about two minutes after connecting to DC power. The LED subsequently resumes normal
operation if the grid is present. See
I.
Connect a clamp meter to one of the conductors of the DC cables from the PV module to measure the
microinverter current. This will be under 1 A if AC is disconnected.
J.
Verify the PV module DC voltage is within the allowable range shown in "Specifications". Refer to the Enphase
compatibility calculator at
electrical compatibility with the microinverter.
K.
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 isn't functioning correctly. If it stays in place, the problem is with the original microinverter. Contact
Enphase Support
if needed.
L.
Check the DC connections between the microinverter and the PV module. The connection may need to be
tightened or reseated. If the connection is worn or damaged, it may need replacement.
26
IQ8MC, IQ8AC, IQ8HC, and IQ8X 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
220 VAC, single-phase **
L1 to L2
L1, L2 to ground
normal LED
https://enphase.com/installers/microinverters/calculator
for help reading the microinverter data and for help in obtaining a replacement microinverter,
© 2023 Enphase Energy Inc. All rights reserved.
for troubleshooting procedures.
211 to 264 VAC
106 to 132 VAC
183 to 229 VAC
106 to 132 VAC
198 to 264 VAC
106 to 132 VAC
operation.
to verify PV module
November 2023
USM-00008-2.0
Advertisement
Table of Contents
