IQ7 Micro Installation

IQ 7 / IQ 7+ / IQ 7X Micro Installation and Operation

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 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. See page

22 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 31 of this manual.

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