16
17
8.2 Troubleshoot an Inoperable Micro Inverter
To troubleshoot an inoperable micro inverter, follow the steps in the order shown.
WARNING: Be aware that only qualified personnel should troubleshoot the PV array
or the Micro inverter.
Best Practice: Never disconnect the DC wire connectors under load. Ensure that no
current is flowing in the DC wires prior to disconnecting. If necessary, use an opaque
covering to cover the PV module prior to disconnecting the PV module. Always
disconnect AC power before disconnecting the PV module wires from the micro
inverter. The AC connector of the micro inverter is suitable as a disconnecting
means.
WARNING: The AC and DC connectors on the cabling are rated as a disconnect
only when used with a micro inverter.
WARNING: The micro inverters are powered by DC power from the PV modules.
Make sure you disconnect the DC connections and reconnect DC power to watch for
the LED blinks one minute after DC is applied.
Make sure AC breakers and disconnects are closed.
Check the connection to the utility grid and verify that the utility voltage is within
allowable ranges shown in the Technical Data section on page 7 of this manual.
Verify that AC line voltage at all solar power circuit breakers at the load center
and subpanels is within the ranges shown in the following table.
Verify that AC line voltage at the junction box for each AC branch circuit are within
the ranges are shown in the following table: econnect DC power to watch for the
LED blinks one minute after DC is applied.
Using an disconnect tool, disconnect the AC cable for the micro inverter in
question from the cable.
Verify that utility power is present at the micro inverter by measuring line to line
and line to neutral at the cable connector.
Visually check that the AC branch circuit connections (cable and AC connections)
are properly seated. Reseat if necessary. Check also for damage, such as rodent
damage.
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.
1.
2.
3.
4.
5.
6.
7.
8.
230 or 240 Volt AC, Single Phase
208 Volt AC, Three Phase
L to N
184~265V AC
(L1 to L2) or (L2
to L3) or ( L3 to
L1)
Disconnect and re-connect the DC PV module connectors. The status LED of
each micro inverter will blink green to indicate normal start-up operation soon
after DC power is applied. The LED subsequently resumes normal operation if the
Grid is present.
Attach an ammeter clamp to one conductor of the DC cables from the PV module
to measure micro inverter current. This will be under one Amp if AC is
disconnected.
Check the DC connections between the micro inverter and the PV module. The
connection may need to be tightened or reseated. If the connection is worn or
damaged, it may need replacement.
Verify with your utility that line frequency is within range.
9.
10.
11.
12.
8.3 Micro Inverter Maintenance
Routine maintenance, although not mandatory, is recommended to maintain efficient
operation of the PV installation.
It is recommended that maintenance operations be only
performed by qualified personnel or personnel.
The maintenance schedule may vary depending on the
environmental conditions of the installation site.
WARNING
Routine Maintenance
Conduct an annual visual inspection (where
possible) on the various components (DC cables,
micro inverters and AC cables) to check for dust,
dirt, moisture and water seepage.
Clean the equipment if necessary. Clean using
compressed air, a vacuum cleaner or special
brushes, if possible.
Check that there has been no drastic change in the
installation conditions that might have a negative
influence on radio communication with the micro
inverters.
Annual Cleaning
Annual Operations
184~265V AC
