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

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
NOTE: *Nominal voltage range can be extended beyond nominal if required by the utility.

Wire 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 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 MCB or fuse,
or isolator.

Lightning and surge suppression

Enphase microinverters have integral surge protection, which is greater than that of 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.
NOTE: Protection against lightning and the resulting voltage surge must be in accordance with
local standards.

Parts and tools required

In addition to the microinverters, PV modules, and racking, you will need the following:

Enphase equipment

•
Enphase IQ
Gateway
refer to the Enphase IQ Gateway Metered Installation and Operations
•
IQ Relay Q-RELAY-3P-INT for single-phase and three-phase installations.
o
In Enphase IQ installations, the IQ Relay acts as a grid monitoring and disconnection device
and includes a built-in phase coupler to distribute power line communication signals across
phases. An external phase coupler is not needed for a three-phase system when the IQ Relay
is installed.
o
The IQ Relay physically isolates the IQ Series Microinverters from the grid when IQ Relay
senses voltage or frequency abnormalities, loss of mains from the grid, or as required by grid
12
184 to 276 VAC
Metered is required to monitor solar production. For installation information,
© 2023 Enphase Energy Inc. All rights reserved.
IQ7+ and IQ7A Installation and Operation Manual - India
Three-phase service
L1, L2, L3 to N 184 to 276 VAC*
Manual.
August 2023
USM-00002-1.0