enphase IQ8 Series 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* IQ8 Series Microinverters per AC branch circuit
Breaker
Single-phase (Single-phase IQ Relay)
Multi-phase (Multi-phase IQ Relay)
NOTE: * Refer to local regulations for overcurrent protection device (OCPD) sizing and to define the
number of microinverters per branch in your area.
NOTE: Minimum two IQ8 Series Microinverters shall be required in system installed in Australia and
New Zealand to meet AS/NZS 4777.2:2020 requirements.
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:
Single-phase service
L1 to N
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% from the start of IQ Cable to the point of supply.
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.
For more details, refer to
Microinverter-Systems.
NOTE: Protection against lightning and resulting voltage surge must be in accordance with
local electrical codes and standards.
12
20 A
25 A
184 to 276 VAC
https:/ /support.enphase.com/s/article/Surge-Protection-for-Enphase-
© 2023 Enphase Energy Inc. All rights reserved.
IQ8AC/IQ8HC Installation and Operation Manual
IQ8AC
11
39
(13 per phase)
Multi-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
June 2023
USM-00005-2.0