APsystems Microinverter QT2-208 Installation Manual 9
4. APsystems Microinverter System Installation
4.3 Installation Procedures
4.3.1 Step 1 - Verify that grid voltage matches microinverter rating
4.3.2 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 - BLACK ; L2 - RED
；
L3 - BLUE.
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.
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.
4.3.3 Step 3 - Attach the APsystems Microinverters to the Racking
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.
Figure 2
