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QS2 Series Microinverter Quick Installation Guide
Step 1
Verify that the grid voltage matches the microinverter rating
Step 2
Y3 AC bus cable distribution
a. One end of the AC bus cable is used to access the junction box connected to the power grid.
b. Wire the conductors of the AC bus as follows: L - BROWN; N - BLUE; PE - YELLOW GREEN;
NOTE: Wiring color codes may vary according to local regulations. Before connecting to the AC bus, ensure that all
wires of the installation match. Incorrect cabling can irreparably damage the microinverters, and such damage is not
covered by the warranty.
During the entire cable laying and installation process, it is essential to ensure that the circuit breakers for the AC bus
and the grid are turned off to prevent accidental electric shock during installation.
ATTENTION: Do NOT carry the microinverter by the AC cable.
This could lead to partial or complete disconnection of the AC cable from the unit, resulting in no operation or
poor operation.
Step 3
Attaching the APsystems microinverters to the racking
a. Mark the location of each microinverter on the rack relative to the PV module junction box or any
other obstructions.
b. Install one microinverter at each of these marked locations using the hardware recommended by your module
racking vendor.
NOTE: Install the microinverters (including DC and AC connectors) beneath the PV modules to protect them
from direct exposure to rain, UV, or other adverse weather conditions.
Leave a minimum of 1.5 cm (3/4 inch) space below and above the microinverter casing to allow proper airflow.
The racking must be grounded in accordance with local electrical codes.
Tip: When flush-mounting photovoltaic modules on the rooftop, ensure that the DC connectors, antenna, and
LED indicator of the microinverter are facing outwards. This arrangement facilitates monitoring of indicator
status and ensures optimal communication quality.
Step 4
Connecting APsystems microinverters to the PV modules
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 indicate that the microinverter is functioning
correctly. This entire check function will start and end within 10 seconds of plugging in the unit. Therefore,
pay close attention to these lights while connecting the DC cables.
WARNING: 1.Double-check to ensure that all AC and DC wiring has been correctly installed. Verify that
none of the AC and/or DC wires are pinched or damaged. Confirm that all junction boxes are properly
closed.
2.Please ensure each DC cable's length within 3 meters.
Each PV panel must be meticulously connected to the same channel. Do not split positive and negative
DC cables into two different input channels, as this will damage the microinverter and void the warranty.
Step 5
Grounding the system
There are three ways to connect grounds on the APsystems QS2：
① Y3 AC Bus cable has an embedded PE wire to ground the inverters in the AC circuit box.
② If the rack is grounded, the grounding washer on the inverter could create a tight bond onto the rack as a ground
connection. This is also a solution to ground the rack through inverter when the inverters are grounded.
③ If an external connection is necessary, an external wire can be bonded to the grounding lug on the exterior of the
inverter and connected to ground.
Step 6
Connecting the APsystems microinverter to the AC bus cable
Insert the microinverter AC connector into the trunk cable connector. Ensure you hear the "click" sound as evidence
of a secure connection.
① Best Practice: Use the AC Bus Cable Unlock Tool to disconnect the connectors.
② NOTE: Cover any unused connectors with the Bus Cable Y-CONN to protect them.
Step 7
Installing a bus cable end cap at the end of the AC bus cable
a. Strip cable jacket.
b. Insert the cable end into the seal.
c. Rotate the nut with 4-5N·m until the latching mechanism meets the base.
①
①
2 EN
M8 - Not supplied by Apsystems
Thoroughfare
③
click
②
25mm-30mm
②
From left to right are:
L-PE-N
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