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The maximum allowed number of IQ8P Microinverters (230 VAC) per AC branch circuit is seven.
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 installations require that you use the Enphase 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.
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.
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. Enphase has tested the following devices:
•
Leviton 51110-SRG
•
Schneider SquareD HEPD50
13
240 VAC, single-phase
L1 to L2
L1, L2 to ground
240 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.
Enphase IQ8P Microinverters
211 to 264 VAC
106 to 132 VAC
198 to 242 VAC
106 to 132 VAC
January 2024
IOM-00002-1.0
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