Utility Service Requirements; Wire Lengths And Voltage Rise; Lightning And Surge Suppression - enphase IQ7 Installation And Operation Manual

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 microinverters work with single-phase or three-phase service. Measure the AC line voltage at
the electrical utility connection to confirm that it is within range:
Single-phase service
L1 to N

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 centre. 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 centre.
Enphase provides guidance about choosing to wire size and maximum conductor lengths in the Voltage Rise
Technical Brief at enphase.com/support.
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 centre-
feed a branch, divide the circuit into two sub-branch circuits protected by a single OCPD.

Lightning and surge suppression

Enphase microinverters have integral surge protection, greater than most traditional inverters. However, if
the surge has sufficient energy, the protection built into the microinverter can be exceeded, and the
equipment can be damaged. For this reason, Enphase recommends that you protect your system with a
lightning and/or surge suppression device. In addition to having some level of surge suppression, it is also
important to have insurance that protects against lightning and electrical surges.
13
IQ7+/IQ7X/IQ7A Microinverters Installation and Operation Manual
Maximum* IQ Microinverters per AC branch circuit
207 to 253 VAC
Refer to this brief for voltage rise values in IQ Cables and on how to
© 2023 Enphase Energy Inc. All rights reserved.
IQ7 IQ7+ IQ7X
16 13 12
48 39 36
Three-phase service
L1 to L2 to L3 360 to 440 VAC
L1, L2, L3 to N
IQ7A
11
39 (25 A OCPD)
207 to 253 VAC (most models)
219 to 264 (IQ7A models)
August 2023
USM-00003-1.0