IQ7 Micro Installation

IQ 7 / IQ 7+ / IQ 7X Micro Installation and Operation

Branch Circuit Capacity

Plan your AC branch circuits to meet the following limits for maximum number of microinverters per

branch when protected with a 20 amp (maximum) over current protection device (OCPD).

Maximum* IQ 7 Micros

per AC branch circuit (240 VAC)

Maximum* IQ 7+ Micros

per AC branch circuit (240 VAC)

Maximum* IQ 7X Micros

per AC branch circuit (240 VAC)

Maximum* IQ 7 Micros

per AC branch circuit (208 VAC)

Maximum* IQ 7+ Micros

per AC branch circuit (208 VAC)

Maximum* IQ 7X Micros

per AC branch circuit (208 VAC)

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:

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

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 Q

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.