Branch Circuit Capacity; Utility Service Requirements; Wire Lengths And Voltage Rise - enphase IQ8MC Installation And Operation Manual

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)
12
Maximum* IQ8MC Microinverters
per AC branch circuit (208 VAC)
10
Maximum* IQ8MC Microinverters
per AC branch circuit (220
VAC)**
NA
NOTE: *Limits may vary. Refer to local requirements to define the number of microinverters per
branch in your area.
** In Mexico,
only IQ8HC supports a 220 V grid

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 as shown in thew following table:
NOTE: For all installations, use the IQ Gateway to commission the microinverters to propagate correct grid
profile settings. This also ensures the microinverter's firmware is upgraded whenever a newer version is
available.
In Mexico,
** only IQ8HC supports a 220 V grid.

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
Brief at enphase.com/contact/support. Refer to this document for information about voltage rise values in IQ
Cables and calculating 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.
13
IQ8MC/IQ8AC/IQ8HC Microinverters Installation and Operation Manual
Maximum* IQ8AC Microinverters
per AC branch circuit (240 VAC)
Maximum* IQ8AC Microinverters
per AC branch circuit (208 VAC)
Maximum* IQ8AC Microinverters
per AC branch circuit (220
240 VAC, single-phase
L1 to L2
L1, L2 to ground
208 VAC, single-phase
L1 to L2
L1, L2 to ground
220 VAC, single-phase**
L1 to L2
L1, L2 to ground
© 2023 Enphase Energy Inc. All rights reserved.
Maximum* IQ8HC Microinverters
per AC branch circuit (240 VAC)
11
Maximum* IQ8HC Microinverters
per AC branch circuit (208 VAC)
9
Maximum* IQ8HC Microinverters
VAC)**
NA
.
211 to 264 VAC
106 to 132 VAC
183 to 229 VAC
106 to 132 VAC
198 to 264 VAC
106 to 132 VAC
10
9
per AC branch circuit (220
VAC)**
9
October 2023
USM-00008-1.0