Figure 28: Center Feeding Of Ac Branch Circuit; Table 16: Ac Branch Circuit Supply Recommendation - enphase IQ8D-72-E-US Design Manual

Step 05: Provide an AC Connection to Branch Circuit
Cable SKU (Pitch)
QD-12-10-150 (4.6 ft)
QD-12-20-135 (7.9 ft)
QD-12-42-63 (15.1 ftv)
* Center feeding possible only with junction box
** Center feeding with center tap connector in QD Cable or junction box
Method A: Center-feeding the Branch Circuit
It is a best practice to center-feed the AC supply to the Microinverter branch circuit to limit voltage rise to less than 2% for
the site. For IQ8D Microinverter system installations with QD-12-42-63, the voltage rise in QD cable is >1%. Hence for all
installations with QD-12-42-63 cable, center feeding of three phase AC supply is recommended.
Follow following installation steps for center feeding the Microinverter branch circuits using center tap connector in
QD-12-42-63.
A QD-12-42-63 (4.6-meter SKU) cable includes a center-
tapping connector in an alternating pattern after every four
and five connectors as shown in Figure 10 so there are
two center tap connectors available for branch of 9.
The center-tapping AC male connector is marked "Center tap"
and "Do Not Connect Microinverter". Do not use the center tap
connectors for connecting to the Microinverter.
B. When installing IQ8D Microinverter system using QD-
12-42-63 cable; select center tap connector such that a
maximum of 6 IQ8D Microinverters are installed on one
© 2022 Enphase Energy Inc. All rights reserved.
PV Module VRise for last Microinverter
Orientation with end feeding
Portrait
Landscape
Landscape Ballast

Table 16: AC Branch Circuit Supply recommendation

Figure 28: Center Feeding of AC Branch Circuit

Recommended
Vrise
0.56% <1% in QD Cable
0.95% <1% in QD Cable
1.83% <1% in QD Cable
side of center tapping connector so that the voltage
rise to the farthest Microinverter is maintained <1%.
When using QD-12-42-63 for installations ; few of the center tap
connectors shall remain unused based on system configuration.
Do not remove pre-installed sealing caps on the center center tap
connector, if the connector is not used for center feeding using
Center Tap Adapter Cable (QD-LINKFW-10).
C. Use a center tapping adapter cable (QD-LINKFW-10) to
connect the center-tapping connector to the extension
cable to PV sub panel using a male three-phase field
wireable connector (QD-CONN-10M).
Center tapping adapter cable
(QD-LINKFW-10)
Center Tap Connector;
Not for Micro
Recommended AC Branch
Connection: End / Center Feeding
End / Center Feeding*
End / Center Feeding*
Center Feeding**
Male Three Phase Field Wireable
Connector (QD-CONN-10M)
Extension cable to PV sub panel
IQ8D-DG-MKT-00397-02-EN-US-2022-06-10 47