Utility Service Requirements; Wire Lengths And Voltage Rise - enphase IQ8 Installation And Operation Manual

Maximum* IQ8 Microinverters
per AC branch circuit (240
VAC)
16
Maximum* IQ8A
Microinverters per AC branch
circuit (240 VAC)
11
NOTE: *Limits may vary. Refer to local requirements to define the number of microinverters per
branch in your area.

Utility service requirements

he IQ Series Microinverters work with single-phase service. Measure AC line voltages at the
T
electrical utility connection to confirm that it is within the ranges shown:
NOTE: All 208 VAC installations require that you use the Enphase IQ Gateway to
commission the Enphase microinverters to propagate correct grid profile settings for 208
VAC trip points.

Wire lengths and voltage rise

When planning the system, you must select the appropriate AC conductor size to minimize voltage
rise. Select the correct wire size based on the distance from the beginning of the microinverter AC
branch circuit to the breaker in the load center. Enphase recommends a voltage rise total of less
than 2% for the sections from the microinverter AC branch circuit to the breaker in the load
center.
Enphase provides guidance about choosing wire size and maximum conductor lengths in the
Voltage Rise Technical
calculate voltage rise in other wire sections of the system.
Standard guidelines for voltage rise on feeder and AC branch circuit conductors might not be
sufficient for microinverter AC branch circuits that contain the maximum allowable
microinverters. This is due to the high inherent voltage rise on the AC branch circuit.
Best practice: Center-feed the branch circuit to minimize voltage rise in a fully populated
branch. This practice greatly reduces the voltage rise as compared with an end-fed
branch. To center-feed a branch, divide the circuit into two sub-branch circuits protected
by a single OCPD.
13
Enphase IQ8, IQ8+, IQ8M, IQ8A, and IQ8H Microinverters
Maximum* IQ8+
Microinverters per AC branch
circuit (240 VAC)
Maximum* IQ8H
Microinverters per AC branch
circuit (240 VAC)
240 VAC, single-phase
L1 to L2
L1, L2 to ground
208 VAC, single-phase
L1 to L2
L1, L2 to ground
Brief. Refer to this brief for voltage rise values in IQ Cables and on how to
© 2024 Enphase Energy Inc. All rights reserved.
Microinverters per AC branch
13
Microinverters per AC branch
10
211 to 264 VAC
106 to 132 VAC
183 to 229 VAC
106 to 132 VAC
Maximum* IQ8M
circuit (240 VAC)
11
Maximum* IQ8H
circuit (208 VAC)
9
January 2024
IOM-00068-1.0