APsystems Microinverter QT2 Installation manual
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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 – AC Bus Cable distribution
a. One end of the AC bus cable is used to access the junction box into the power grid.
b. Wire the conductors of the AC bus: L1- BROWN; L2 - BLACK; L3 - GRAY; N - BLUE; PE – YELLOW
GREEN.
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,make sure the grounding washer is facing the racking.
Figure 2
