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WARNING: Never disconnect the DC wire connectors under load.
Ensure that no current is flowing in the DC wires prior to
disconnecting.
WARNING: Always disconnect AC power before disconnecting the PV
module wires from the Enphase Micro-Inverter.
WARNING: The Enphase Micro-Inverters are powered both by AC
power from the utility grid and DC power from the PV modules. Make
sure you disconnect both the AC and the DC connections and
reconnect either AC or DC power to hear the six start-up beeps.
Troubleshooting Suggestions for inoperable Micro-Inverters
Check the connection to the utility grid. Verify the utility voltage and
!
frequency are within allowable ranges shown in the Technical Data section of
this manual. Verify utility power is present at the inverter in question by
removing AC, then DC power. Never disconnect the DC wires while the Micro-
Inverter is producing power. Re-connect the AC power conductor and listen
for 6 short beeps.
Check the AC branch circuit interconnection harness between all the Micro-
!
Inverters. Verify each inverter is energized by the utility grid with the
previous procedure.
Check the DC connections between the Micro-Inverter and the PV module.
!
Verify the PV module DC voltage is within the allowable range shown in the
!
Technical Data section of this manual.
Make sure that all the AC switches in the junction boxes are functioning
!
properly and are closed.
If the problem persists, please call customer support at Enphase Energy.
!
Disconnecting the Enphase Micro-Inverter from the PV Module
To insure the Micro-Inverter is not disconnected from the PV modules under load,
adhere to the following procedure in the order shown:
1
Turn off the AC disconnect on the AC branch circuit junction box.
2
Turn off the utility-grid AC circuit breaker.
3
Disconnect the AC branch circuit wire harness connector(s).
4
Using a DC current probe, verify there is no current flowing in the DC wires
between the PV module and the Micro-Inverter.
5
If there is measurable DC current, cover the PV module connected to the
Micro-Inverter with an opaque material.
6
Disconnect the PV module DC wire connectors from the Micro-Inverter.
7
Remove the Micro-Inverter from the PV array racking.
Page 11
Copyright Enphase Energy Inc. 2008
Release 1.4
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Troubleshooting
