Troubleshoot An Inoperable Microinverter - enphase IQ 7 Installation And Operation Manual

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:
Single-Phase Service
L1 to N
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. Disconnect and re-connect the Enphase DC 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 "Specifications" on
page 30 of this manual.
L. Following the steps in Remove and Replace a Microinverter, remove the PV panel from the
roof, and swap out the microinverter with one from a known good, adjacent AC 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
help in reading the microinverter data and for help in obtaining a replacement microinverter, if
needed
25
207 to 253 VAC L1 to L2 to L3
L1, L2, L3 to N
© 2021 Enphase Energy Inc. All rights reserved.
IQ Microinverter for ACM Applications
Three-Phase Service
360 to 440 VAC
207 to 253 VAC (most models)
219 to 264 (IQ 7A models)
Enphase Customer Support for
January 06, 2021