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Safety, Installation, and Operations Manual
© Solaria Corporation All rights reserved. Contents subject to change without notice 8-26-19
Power Unlocked by Design
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. 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 32 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.