Phase Balancing In Iq8D Installations Using The Three Phase Qd Cable Phase Rotation; Ac Qd Cable For Iq8D Microinverter; Figure 66: Iq8D Microinverter; Table 19: Qd Cable Types / Ordering Options - enphase IQ8D-72-E-US Design Manual

Phase Balancing in IQ8D Installations using the
Three Phase QD Cable Phase Rotation
Enphase IQ8D Microinverters supports two series connected
PV modules and has a 4 pin output configuration (L1, L2, L3 and
Neutral Sense) with Power on 2 pins and sensing on the other
two pins. The Single-Phase IQ8D Microinverter achieves the
three-phase configuration and phase balancing using the Three
Phase QD Cable Phase rotation. This Technical Note shall help
to understand the phase rotation configuration for QD Cable and
how phase balancing is achieved for IQ8D Microinverter System.

AC QD Cable for IQ8D Microinverter

QD Cable is a 12 AWG cable with 4 conductors for L1, L2, L3 and neutral sense. QD Cable has power on two phases (P1,
P2 Pins) and sensing on the other phase and neutral for phase loss sensing (P3, P4 Pins). This arrangement alternates
between phases for each drop to achieve self-phase balancing. The QD Cable 4 pin male connectors plug directly into the
IQ8D Microinverters, whose double insulated rating requires no ground conductors.
Based on PV module orientation specific to installation site, QD Cable provides following ordering options –
Model Number
QD-12-10-150
QD-12-20-135
QD-12-42-63
© 2022 Enphase Energy Inc. All rights reserved.
QD CABLE TYPES / ORDERING OPTIONS
Size
Max Voltage
277 VAC 12 AWG
277 VAC 12 AWG
277 VAC 12 AWG

Table 19: QD Cable Types / Ordering Options

Connector
PV Module Orientation
Spacing
1.4 m (4.6 ft)
2.4 m (7.9 ft)
4.6 m (15.1 ft) Landscape Ballast

Figure 66: IQ8D Microinverter

Connector
Count per Box
Portrait
Landscape
IQ8D-DG-MKT-00397-02-EN-US-2022-06-10
150
135
63
81