Iq8 Commercial Vrise For 208 Vac In Qd Cable - enphase IQ8 Design Manual

multiple center tap connectors in the branch circuit. Select the center tap connector
such that a maximum of 9 IQ8 Commercial Microinverters are installed on either side of
the center tap connector to limit voltage rise <1% in the QD Cable.
•
Use a female three-phase field wireable connector (QD-CONN-10F) to connect the
extension cable to the 3-pole 20 A over-current protection device (OCPD) in the PV
subpanel.

2.3.2 IQ8 Commercial VRise for 208 VAC in QD Cable

Refer to the following tables to find the VRise in QD Cable for your project based on the number of IQ8
Commercial Microinverters in an AC Branch Circuit.
Table 8 through Table 15 below provide VRise values for the IQ8 Commercial Microinverters in an AC
branch circuit (with a maximum of 9 microinverters per branch circuit) for multiple QD Cable options.
Use these values to help calculate the total VRise for your project based on the number of
microinverters in the branch circuit. As the number of microinverters in a branch circuit increases, the
voltage at each microinverter rises in an exponential manner.
Portrait PV module orientation – 1.7 m (5.6 ft) pitch
Table 8: Internal QD Cable VRise (IQ8P-3P – 208 V/Portrait cable, QD-12-13-120)
IQ8P-3P Microinverters per branch (208 VAC three-phase system)
IQ8P-3P-72-E-
US
1
VRise (V) 0.051
VRise (%) 0.02% 0.03% 0.09% 0.15% 0.22% 0.29% 0.39% 0.50% 0.61% 0.74% 0.88% 1.03%
Portrait PV module landscape – 2.4 m (7.9 ft) pitch
Table 9: Internal QD Cable VRise (IQ8P-3P – 208 V/Portrait cable, QD-12-20-120)
IQ8P-3P-72-E-
US
1
VRise (V) 0.072 0.165 0.272 0.451 0.651 0.866
VRise (%) 0.03% 0.08% 0.13% 0.22% 0.31% 0.42% 0.55% 0.70% 0.86% 1.05% 1.25%
Portrait PV module landscape – 2.9 m (9.5 ft) pitch
Table 10: Internal QD Cable VRise (IQ8P-3P – 208 V/Portrait cable, QD-12-25-108)
IQ8P-3P-72-E-
US
1
VRise (V) 0.087 0.199 0.328 0.545 0.787 1.047
VRise (%) 0.04
%
20
2 3 4
0.117 0.193 0.32 0.461
IQ8P-3P Microinverters per branch (208 VAC three-
2 3 4 5
IQ8P-3P Microinverters per branch (208 VAC three-
2 3 4
0.10% 0.16% 0.26% 0.38% 0.50
© 2023 Enphase Energy Inc. All rights reserved.
IQ8 Commercial Microinverter grid-tied PV system
5 6 7 8
0.614 0.817 1.035
phase system)
6 7 8
1.154 1.461
phase system)
5 6 7 8
1.394 1.765
0.67% 0.85% 1.04% 1.27%
%
9 10 11
1.264 1.544 1.838 2.144
9 10 11 12
1.784 2.18 2.595 3.027
1.46%
9 10 11
2.156 2.634 3.136 3.657
1.51% 1.76%
November 2023
USG-00026-1.0
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