3. Verify that AC line voltages at all solar power circuit breakers at the load center and
sub-panels are within the ranges shown in the following table.
4. Verify that AC line voltage at the junction box for each AC branch circuit is within the
ranges shown in the following table:
5. Using an APsystems disconnect tool, disconnect the AC cable for the microinverter in
question from the trunk cable.
6. Verify that utility power is present at the microinverter by measuring line to line and
line to neutral at the trunk cable connector.
7. Visually check that the AC branch circuit connections (trunk cable and AC
connections) are properly seated. Reseat if necessary. Check also for damage, such as
rodent damage.
8. 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.
9. Disconnect and reconnect the DC PV module connectors. The Status LED of each
microinverter will light solid green three times in a few seconds after connection to DC
power and then blink green every ten seconds indicate normal start-up operation about
five minutes after connecting to DC power. The LED subsequently resumes normal
operation if the grid is present. See page 15 of the Installation and Operation Manual
for normal LED operation. (YC600/QS1)
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