IQ8MC/IQ8AC/IQ8HC Installation and Operation Manual
11 © 2023 Enphase Energy Inc. All rights reserved. September 2023
IOM-00029-1.0
Branch circuit capacity
Plan your AC branch circuits to meet the following limits for the maximum number of microinverters per
branch circuit.
Maximum* IQ8 Series Microinverters per AC branch circuit
Breaker IQ8MC IQ8AC IQ8HC
20 A Multi-phase 33 (11 per phase) 30 (10 per phase) 27 (9 per phase)
25 A Multi-phase** 39 (13 per phase) 36 (12 per phase) 36 (12 per phase)
NOTE: * Refer to local regulations for overcurrent protection device (OCPD) sizing and define the
number of microinverters per branch in your area.
** This breaker option is not available in Europe.
Electricity network requirements
The IQ8 Series Microinverters work with single-phase or multi-phase grid connections. Measure AC line
voltages at the point of connection to confirm that it is within the ranges shown:
Conductor lengths and voltage rise
When planning the system, you must select the appropriate AC conductor size to minimize voltage rise.
Select the correct conductor size based on the distance from the junction with the microinverter AC
branch circuit to the circuit breaker in the electrical panel. Enphase recommends a voltage rise total of
less than 2% for the sections from the microinverter AC branch circuit to the circuit breaker in the
electrical panel.
Best practice: Center-feed the branch circuit to minimize voltage rise in a fully populated branch.
This practice substantially 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 conventional 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.
NOTE: Protection against lightning and resulting voltage surge must be in accordance with local
electrical codes and standards.
L1 to N 184 to 276 VAC
L1 to L2 to L3 319 to 478 VAC
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