APsystems QT2 Quick Installation Manual

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Step 1. Verify that grid voltage matches microinverter rating

Step 2. Y3 AC Bus Cable distribution

a. Each connector drop of the AC Bus cable matches the position of the microinverter.
b. One end of the AC bus cable is used to access the junction box into the power grid.
c. Wire the conductors of the AC bus:L1 - BROWN; L2 - BLACK;L3 - GRAY(European Standard);or L1 -
BLACK; L2 - RED；L3 - BLUE(American Standard).
NOTE: Wiring color code can be different according to the local regulation. Check all the wires of the
installation before connecting to the AC bus to be sure they match. Wrong cabling can damage irreparably
the microinverters: such damage is not covered by the warranty.

Step 3. Attach the APsystems Microinverters to the Racking

NOTE: Install the microinverters (including DC and AC connectors) under the PV modules to avoid direct
exposure to rain, UV or other harmful weather events. Allow a minimum of 1.5 cm (3/4' ') below and above the
casing of the microinverter to allow proper air flow. The racking must be properly grounded as per local
electrical code.
ATTENTION: Do NOT carry the microinverter by the AC cable. This may cause the AC cable to partially or
fully disconnect from the unit, resulting in no or poor operation.
a. Mark the location of the microinverter on the rack, with respect
to the PV module junction box or any other obstructions.
b. Mount one microinverter at each of these locations using
hardware recommended by your module racking vendor.

Step 4. Ground the system

There're 2 ways to ground the QT2 series microinverters.
1. By grounding washer attached.
After the microinverters and racking are reliably installed, the
microinverter's grounding washer can connect to the racking to
ensure proper earthing.
2. By grounding copper wire.
Fix the grounding copper wire by the grounding lug.

Step 5. Connect the APsystems microinverter to AC bus cable

Insert the microinverter AC connector into the trunk cable
connector. Make sure to hear the "click" as a proof of robust
connection.
①Best Practice: Use the Bus Cable Unlock Tool of AC Bus to
disconnect the connectors.
②NOTE: AC connector interface as from left to right.
③NOTE: Cover any unused connectors with Bus Cable Y-CONN
Cap to protect the unused connectors.

Step 6. Install a Bus Cable End Cap at the end of AC bus cable

a b
Step 7. Place the PV modules and connect each QT2 to the PV modules
NOTE: When plugging in the DC cables, the microinverter should immediately blink green ten times.
This will happen as soon as the DC cables are plugged in and will show that the microinverter is
functioning correctly. This entire check function will start and end within 10 seconds of plugging in
the unit, so pay careful attention to these lights when connecting the DC cables.
WARNING! Double check to make sure all of the AC and DC wiring has been correctly installed.
Ensure that none of the AC and/or DC wires are pinched or damaged. Make sure that all of the
junction boxes are properly closed.
QT2 Microinverter Quick Installation Guide
c
M8 (Not supplied by
Apsystems)
②
L1
3.3N·m
1 2022/07/12
grounding washer
Warning injure hand
grounding
lug
①
Click
③
L2
L3
Rev2.0 Quick Installation Guide