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TECHNICAL BRIEF – North America

Planning for a Commercial IQ Microinverter System

The Enphase IQ Microinverter system is inexpensive to install and provides a wide range

of new installation options to solar professionals. The IQ Microinverter system is

available for single-phase and three-phase applications. New components

available as part of this system provide additional options for reducing

Balance of System (BOS) costs and installation complexity. This

planning brief introduces solar installation professionals to the new

components, provides guidance on component selection, and gives tips for

various system design and installation scenarios.

The Enphase Commercial IQ Microinverter system includes the following:

• Enphase IQ 6 and IQ 6+ Microinverters and Enphase Energized AC Modules

• Enphase IQ Envoy

• Enphase Q Cable and accessories

• Enphase Enlighten and apps

• Additional commercial components coming in late 2017

This brief includes the following sections:

IQ 6 and IQ 6+ Microinverters......................................................................................................................... 1

IQ Envoy ......................................................................................................................................................... 2

Q Cable and IQ Microinverter Accessories ..................................................................................................... 2

Commercial IQ System Design ....................................................................................................................... 5

Splicing Q Cable and Raw Q Cable with Junction Boxes ............................................................................ 15

Wire Management of AC and DC Cables Under Array ................................................................................. 16

AC Wire Management at the Junction Box ................................................................................................... 18

Installing IQ Microinverters with Frame Mount Bracket ................................................................................ 18

Q Commercial Relay Controller (Q-RELAY-3P-NA) for Dropped Phase and Neutral Protection ................. 19

IQ 6 and IQ 6+ Microinverters

The IQ 6 and IQ 6+ Microinverters have a 97% CEC efficiency for split phase applications and are available

at peak output power ratings of 240 watts and 290 watts respectively. The maximum number of

microinverters per 20A branch circuit is detailed below. For a three-phase, 208V, and 240V systems,

Enphase Microinverters may be installed on two-pole circuit breakers and following the maximums listed in

the table below. See the IQ product data sheets for complete product specifications at Enphase.com.

Maximum

IQ Microinverters

per AC branch circuit

IQ 6 Microinverters (single-phase 240 VAC)

IQ 6+ Microinverters (single-phase 240 VAC)

IQ 6 Microinverters (single-phase 208 VAC)

IQ 6+ Microinverters (single-phase 208 VAC)

IMPORTANT: The Enphase IQ Envoy and IQ 6 and IQ 6+ Microinverters do not communicate with, and

should not be used with, previous generation Enphase Microinverters, AC Batteries, and Envoys.

Summary of content (19 pages)

PAGE 1
TECHNICAL BRIEF – North America Planning for a Commercial IQ Microinverter System The Enphase IQ Microinverter system is inexpensive to install and provides a wide range of new installation options to solar professionals. The IQ Microinverter system is available for single-phase and three-phase applications. New components available as part of this system provide additional options for reducing Balance of System (BOS) costs and installation complexity.
PAGE 2
Planning for a Three-Phase IQ Microinverter System – North America IQ Envoy When designing a three-phase, commercial scale system, it is critical to install the IQ Envoy (model ENV-IQAM1-240 M). The IQ Envoy communicates with up to 600 IQ Series Microinverters in a single-phase or three-phase applications. Do not install an IQ Combiner Box; it is only for single-phase applications.
PAGE 3
Planning for a Three-Phase IQ Microinverter System – North America Q CABLE SPECIFICATIONS Voltage rating 600V (connector rating 250 V) Cable temperature rating 90° C (194° F) Certification UL3003, DG cable Flame test rating FT4 Compliance RoHS, OIL RES I, CE, UV resistant, combined UL for Canada and United States Conductor rating THHN/THWN-2 dry/wet Q Cable is a UL3003 DG (Distributed Generation) listed cabling system.
PAGE 4
Planning for a Three-Phase IQ Microinverter System – North America ENPHASE Q CABLE ACCESSORIES Name Model Number Description Q Aggregator Q-BA-3-1P-60 Combines up to three microinverter AC branch circuits into one home run Field Wireable Q Connector (male) Q-CONN-10M Field Wireable Q Connector (female) Q-CONN-10F Q Clip Q-CLIP-100 Make Q Cable connections to any Q Aggregator open connector or female Field Wireable Q Connector Make Q Cable connections to any Q Cable open connector or male Field W
PAGE 5
Planning for a Three-Phase IQ Microinverter System – North America Sealing Caps Unused Q Cable connectors must be sealed with a watertight sealing cap (Q-SEAL). Male connector on Q Cable Female Sealing Cap (Q-SEAL) Seal each unused connector on the Q Aggregator with a male sealing cap. Also, use male sealing caps to temporarily seal any exposed IQ Microinverter connectors not connected to the Q Cable to protect against moisture or water damage at the exposed connector during construction.
PAGE 6
Planning for a Three-Phase IQ Microinverter System – North America branch circuit breaker wired directly off the solar subpanel. Wire the IQ Envoy with two hot conductors and a neutral. A 208Y/120V interconnection is a Wye type interconnection. A Wye utility service requires a neutral ground bond at the center point of the transformer.
PAGE 7
Planning for a Three-Phase IQ Microinverter System – North America Ampacity Calculations for Three-Phase Feeders to 208Y/120V Solar Subpanel Calculate the ampacity of the three-phase, 208Y/120V solar subpanel feeders from the continuous output power rating as follows: # of Microinverters ∗ Inverter Continuous Output Power Rating = Total Continuous Output Power Total Continuous Output Power / 208𝑉 / 1.
PAGE 8
Planning for a Three-Phase IQ Microinverter System – North America Three-phase, 240V High-Leg Delta System Design Designing a three-phase, 240V high-leg delta (also known as 240V delta with stinger) system is very simple with Enphase IQ Microinverters and does not require a transformer. IQ Microinverters do not require a neutral connection, so can be installed on all three phases in a 240V system.
PAGE 9
Planning for a Three-Phase IQ Microinverter System – North America Ampacity Calculations for Three-Phase Feeders to 240V High-Leg Delta Solar Subpanel Calculate the ampacity of the 240V high-leg delta three-phase solar subpanel feeders from the continuous output power rating as follows: # of Microinverters * Inverter Continuous Output Power Rating = Total Continuous Output Power Total Continuous Output Power / 240V / 1.
PAGE 10
Planning for a Three-Phase IQ Microinverter System – North America Three-Phase, 240V Delta with No Neutral All of the recommendations related to a 240V system apply to a 240V delta, with the exception that you must use a small auto-transformer to provide a 120V connection to power the Envoy. Generating a Neutral for 240V Delta Interconnections In the case that the site is 240V delta without a neutral, use an auto-transformer for generating a 120V connection to power the Envoy.
PAGE 11
Planning for a Three-Phase IQ Microinverter System – North America Interconnecting IQ Microinverters to Other Voltages For interconnection to system voltages other than 120/240V single-phase, 120/208 single-phase, 208Y/120V three-phase, and 240V high-leg delta three-phase, a transformer is required to interconnect to the grid. While transformers interconnect Enphase Microinverter Systems to any utility power voltage, they also offer other benefits.
PAGE 12
Planning for a Three-Phase IQ Microinverter System – North America Transformer Specification (Table of Various Voltage Configurations) Utility voltage configurations Nominal voltages between the lines and neutral/ground L1 to L2 L2 to L3 L3 to L1 L1 to N/G L2 to N/G L3 to N/G 208Y/120V 208 208 208 120 120 120 277 277 277 No transformer would be specified for interconnection 480Y/277V 480 480 480 Specify a 480 delta:208Y/120V transformer or 480 delta:240 high-leg delta transformer 480 d
PAGE 13
Planning for a Three-Phase IQ Microinverter System – North America Filtering with Enphase Q-LCF-250-3P Enphase provides a 250A power line filter. You can use it to filter electrical noise or signals between multiple IQ Envoys and their respective communication domains. The filter must be protected by a 250A or smaller OCPD. When installing a power line filter in an IQ System, the microinverters and the IQ Envoy must all be located on the load side of the filter.
PAGE 14
Planning for a Three-Phase IQ Microinverter System – North America Enclosure Options for the IQ Envoy Arlington EB1212-BP Enclosure with Back Plate • Lockable unit dimensions are 12"x12"x4" • Easily accommodates the addition of a fieldwired receptacle, if needed • Outdoor rated with hinged door opening upward, but indoor rated with hinge to side Orbit 57905 Timer Cabinet • Back plate included, NEMA3R, lockable • Approximate dimensions are 11"x10"x5" • Includes a receptacle pre-installed (not wir
PAGE 15
Planning for a Three-Phase IQ Microinverter System – North America Splicing Q Cable and Raw Q Cable with Junction Boxes For complex installations that include multiple arrays, it is possible to use raw Q Cable (Q-12-RAW-300) to service the arrays and branch circuits that originate directly at the primary roof mounted junction box.
PAGE 16
Planning for a Three-Phase IQ Microinverter System – North America Wire Management of AC and DC Cables Under Array Since the Q Cable contains only two conductors, it is smaller and lighter than the previous generation Engage Cable. For this reason, we use cable clips with a reduced wire retention area for the Q Cable. The outer dimensions of the Q Cable allow it to be supported by many of the existing PV cable clips and USE-2 cable clips that are frequently used for supporting the DC module leads today.
PAGE 17
Planning for a Three-Phase IQ Microinverter System – North America Q Cable and raw Q Cable must be supported at intervals not to exceed 6 feet, ensuring the cable does not touch the roof surface.
PAGE 18
Planning for a Three-Phase IQ Microinverter System – North America AC Wire Management at the Junction Box Wire management practices at the junction box are critical to the long-term reliability of any PV system. Installers often install the roof-mounted junction box on the side of a rail. For Junction Box Applications Follow these recommendations to prevent moisture from accumulating in the junction box.
PAGE 19
Planning for a Three-Phase IQ Microinverter System – North America Q Commercial Relay Controller (Q-RELAY-3P-NA) for Dropped Phase and Neutral Protection The Enphase Q Commercial Relay Q-RELAY-3P-NA monitors line and neutral voltages and signals the coil of a contactor in case of a dropped phase or opened neutral. The relay controller is field selectable with support for 120/208Y and for 240V high-leg delta applications.