APsystems QS1A Installation/User Manual
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6. Troubleshooting
6.2 Troubleshooting a non-operating APsystems Microinverter
There are two possible overall areas of trouble:
A. The Microinverter itself may be having problems.
B. The Microinverter itself is working fine but it is having trouble communicating with the
ECU. The items below refer to Microinverter issues, not communication issues (addressed
in the ECU manual).
A quick way to tell whether the issue is the Microinverter or communication problem with the
ECU:
1.
Diagnosing from the Microinverter: A red light – either blinking or solid on the
Microinverter, or no light at all. No light, or a red light, means it is definitely a
Microinverter problem.
2.
Diagnosing from the ECU:
a.
No-Data-Display: This is probably a communication issue- not a Microinverter
problem.
b.
Problems with erratic display: Data is displayed for some period and then no data
is displayed: most likely a communication issue.
c.
0 watts, or 2 watts: Possibly a Microinverter problem
d.
Erratic data display that is not coordinating with data displays from other units:
most likely a Microinverter problem.
To troubleshoot a non-operating APsystems Microinverter, Follow
the steps below in order:
1.
Verify the utility voltage and frequency are within ranges shown in the Technical
Data section of this manual.
2.
Check the connection to the utility grid. Verify utility power is present at the inverter
in question by removing AC, then DC power. Never disconnect the DC wires while
the microinverter is producing power. Re-connect the DC module connectors and
watch for three short LED flashes.
3.
Check the AC branch circuit interconnection between all the microinverters. Verify
each inverter is energized by the utility grid as described in the previous step.
4.
Make sure that any AC breaker are functioning properly and are closed.
5.
Check the DC connections between the microinverter and the PV module.
6.
Verify the PV module DC voltage is within the allowable range shown in the Technical
Data of this manual.
7.
If the problem persists, please call APsystems Customer Support.
Do not attempt to repair the APsystems Microinverter. If troubleshooting methods fail,
please return the microinverter to your distributor for replacement.
.
6.3 Maintenance
No need to Maintenance.
