APsystems DS3 Series Quick Installation Manual

DS3 Series Microinverter Quick Installation Guide
Step 1

Verify that the grid voltage matches the microinverter rating

Y3 AC bus cable distribution

Step 2
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:
European Standard: L - BROWN; N - BLUE; PE - YELLOW GREEN;
American Standard: L1 - BLACK; L2 - RED; PE - 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.
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.

Attaching the APsystems microinverters to the racking

Step 3
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

Grounding the system

There are three ways to connect grounds on the APsystems DS3：
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 5

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 6

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
M8 - Not supplied by Apsystems
①
25mm-30mm
Thoroughfare
③
click
①
2024/01/08 Rev4.0 Quick Installation Guide
②
From left to right are:
L-PE-N or L1-PE-L2.
②