enphase IQ8X - Branch Circuit Capacity; Utility Service Requirements; Wire Lengths and Voltage Rise

IQ8MC, IQ8AC, IQ8HC, and IQ8X Microinverters Installation and Operation Manual
12 © 2023 Enphase Energy Inc. All rights reserved. November 2023
USM-00008-2.0
Branch circuit capacity
Plan your AC branch circuits to meet the following limits for the maximum number of microinverters per branch when
protected with a 20 A (maximum) over current protection device (OCPD).
Maximum* IQ8MC
Microinverters per AC
branch circuit (240 VAC)
Maximum* IQ8AC
Microinverters per AC
branch circuit (240 VAC)
Maximum* IQ8HC
Microinverters per AC
branch circuit (240 VAC)
Maximum* IQ8X
Microinverters per
AC branch circuit
(240 VAC)
12 11 10 10
Maximum* IQ8MC
Microinverters per AC
branch circuit (208 VAC)
Maximum* IQ8AC
Microinverters per AC
branch circuit (208 VAC)
Maximum* IQ8HC
Microinverters per AC
branch circuit (208 VAC)
Maximum* IQ8X
Microinverters per
AC branch circuit
(208 VAC)
10 9 9 9
Maximum* IQ8MC
Microinverters per AC
branch circuit (220
VAC)**
Maximum* IQ8AC
Microinverters per AC
branch circuit (220
VAC)**
Maximum* IQ8HC
Microinverters per AC
branch circuit (220
VAC)**
Maximum* IQ8X
Microinverters per
AC branch circuit
(220 VAC)
NA NA 9 NA
NOTE: *Limits may vary. Refer to local requirements to define the number of microinverters per
branch in your area.
**
Only IQ8HC supports 220 V Grid in Mexico.
Utility service requirements
The IQ8 Series Microinverters work with single-phase service. Measure AC line voltages at the electrical utility
connection to confirm that it is within the ranges in the following table:
NOTE: All installations require that you use the IQ Gateway to commission the microinverters to propagate
correct grid profile settings. This will also ensure that the microinverter's firmware is upgraded whenever a
newer version is available.
** Only IQ8HC supports 220 V Grid in Mexico.
Wire lengths and voltage rise
When planning the system, select the appropriate AC conductor size to minimize voltage rise. Select the correct wire
size based on the distance from the microinverter AC branch circuit's beginning to the load center breaker. Enphase
recommends a voltage rise of less than 2% for the sections from the microinverter AC branch circuit to the breaker
in the load center.
Enphase guides choosing wire size and maximum conductor lengths in the Voltage Rise Technical Brief at
Enpase Support
. Refer to this brief for voltage rise values in IQ Cables and how to calculate voltage rise in other wire
sections of the system.
240 VAC, single-phase
L1 to L2 211 to 264 VAC
L1, L2 to ground 106 to 132 VAC
208 VAC, single-phase
L1 to L2 183 to 229 VAC
L1, L2 to ground 106 to 132 VAC
220 VAC, single-phase**
L1 to L2 198 to 264 VAC
L1, L2 to ground 106 to 132 VAC