Planning The Racking; Grounding Considerations; Branch Circuit Capacity; Utility Service Requirements - enphase IQ7 Installation And Operation Manual

Planning the racking

Plan the racking position with the microinverter in mind. Ensure that the racking does not interfere with the
microinverter and its connectors.

Grounding considerations

The Enphase microinverter models listed in this guide do not require grounding electrode conductors (GEC),
equipment grounding conductors (EGC), or grounded conductor (neutral). Your Authority Having
Jurisdiction (AHJ) may require you to bond the mounting bracket to the racking. If so, use UL2703 hardware
or star washers. The microinverter itself has a Class II double-insulated rating, which includes ground fault
protection (GFP).

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).
Microinverter model
Single-phase
Multi-phase
NOTE: *Limits may vary. Refer to local requirements to define the number of microinverters per
branch in your area.

Utility service requirements

The Enphase IQ Microinverter for the AC Module work with single-phase service. Measure AC line voltages at
the electrical utility connection to confirm that it is within the ranges shown:
Single-phase service
L1 to N 207 to 253 VAC

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 total voltage rise 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/support. Refer to this brief for voltage rise values in IQ Cables and on how to
calculate voltage rise in other wire sections of the system.
11
Maximum* IQ Microinverters per AC branch circuit
IQ7 IQ7+
16 13
48 39
L1 to L2 to L3
L1, L2, L3 to N
© 2023 Enphase Energy Inc. All rights reserved.
IQ Microinverters for AC Module applications
IQ7X IQ7A
12 11
36 39 (25 A OCPD)
Three-phase service
360 to 440 VAC
207 to 253 VAC (most models)
219 to 264 (IQ7A models)
June 2023
USM-00001-1.0