enphase IQ8MC Installation And Operation Manual page 12

Branch circuit capacity
Plan your AC branch circuits to meet the following limits for the maximum number of microinverters per
branch circuit.
Maximum* IQ8MC, IQ8AC, and IQ8HC Microinverter per AC branch circuit
Breaker
20 A
Single-phase (single-
phase IQ Relay)
25 A
Three-phase (three-
phase IQ Relay)
NOTE: *Refer to local regulations for overcurrent protection device (OCPD) sizing and define the
number of microinverters per branch in your area.
NOTE: A minimum of two IQ8 Series Microinverters are required in systems installed in Australia and
New Zealand to meet AS/NZS 4777.2:2020 requirements.
Electricity network requirements
The IQ8 Series Microinverter works with single-phase or three-phase grid connections. Measure AC line
voltage at the point of connection to confirm that it is within the ranges shown:
Single-phase service
L1 to N
Conductor lengths and voltage rise
When planning a 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% from the start of IQ Cable to the point of supply.
Best practice: Centre-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
centre-feed a branch, divide the circuit into two sub-branch circuits protected by a single OCPD.
Lightning and surge suppression
IQ8 Series Microinverters have integral surge protection, greater than most conventional inverters.
However, if a 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. For more details,
refer to https:/ /support.enphase.com/s/article/Surge-Protection-for-Enphase-Microinverter-Systems.
NOTE: Protection against lightning and resulting voltage surges must be in accordance with
local electrical codes and standards.
12
IQ8MC, IQ8AC, and IQ8HC Installation and Operation Manual
IQ8MC
12
42
(14 per phase)
184 to 276 VAC
© 2023 Enphase Energy Inc. All rights reserved.
IQ8AC
11
39
(13 per phase)
Three-phase service
L1 to L2 to L3
L1, L2, L3 to N
IQ8HC
10
36
(12 per phase)
319 to 478 VAC
184 to 276 VAC
November 2023
USM-00006-2.0