Disconnect A Microinverter - enphase IQ8 Design Manual

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 the AC line voltage at the junction box for each AC branch circuit is within the
ranges shown in the following table.
E. Using the QD Disconnect Tool, disconnect the AC cable for the microinverter in question
from the Enphase QD Cable.
F. Verify that utility power is present at the microinverter by measuring line to line and line to
ground at the Enphase QD Cable connector.
G. Visually check that the AC branch circuit connections (Enphase QD 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 and the dedicated circuit breakers for each
AC branch circuit are functioning and closed.
I. Disconnect and reconnect 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.
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 as mentioned in IQ8
Commercial Microinverter specifications.
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 is not functioning correctly. If it stays in
place, the problem is with the original microinverter. Contact Enphase Customer
Support for help in reading the microinverter data and for help in obtaining a
replacement microinverter, if needed.
M. 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.
N. Verify with your utility that the line frequency is within range.
O. If the problem persists, contact

7.4 Disconnect a microinverter

If problems remain after following the troubleshooting steps listed previously, contact
Support. If Enphase authorizes a replacement, follow the steps below. To ensure the microinverter is not
disconnected from the PV modules under load, follow the disconnection steps as follows:
A. De-energize the AC branch circuit breaker.
62
Service type and line voltage
208 VAC three-phase
Enphase Support.
© 2023 Enphase Energy Inc. All rights reserved.
IQ8 Commercial Microinverter grid-tied PV system
183 V–229 V
Enphase
November 2023
USG-00026-1.0