Enphase IQ8 Install and Operation Manual

IQ8 / IQ8+ / IQ8M / IQ8A / IQ8H Micro Installation and Operation

NOTE: *Limits may vary. Refer to local requirements to define the number of microinverters per

branch in your area.

Utility Service Requirements

The Enphase IQ Series Micros work with single-phase service. Measure AC line voltages at the electrical utility

connection to confirm that it is within the ranges shown:

NOTE: All 208 VAC installations using IQ8H-208 Micros require that you use the Enphase IQ Gateway to

commission the Enphase Microinverters to propagate correct grid profile settings for 208 VAC trip points.

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 Brief at enphase.com/support. Refer to this brief for voltage rise values in Enphase IQ Cables and on how

to 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 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

NOTE: Protection against lightning and resulting voltage surge must be in accordance with local

standards.

240 Volt AC, Single Phase

L1 to L2

211 to 264 VAC

L1, L2 to ground

106 to 132 VAC

208 Volt AC, Single Phase

L1 to L2

183 to 229 VAC

L1, L2 to ground

106 to 132 VAC