enphase IQ8 Design Guide

IQ8 Commercial Microinverter grid-tied PV system
3 © 2023 Enphase Energy Inc. All rights reserved. November 2023
USG-00026-1.0
Contents
Corporate headquarters contact information ....................................................................................... 2
FCC compliance ......................................................................................................................................2
Other information ...................................................................................................................................2
Audience ...................................................................................................................................................2
Important safety information .................................................................................................................... 6
Read this first .......................................................................................................................................... 6
Product labels ......................................................................................................................................... 6
Safety and advisory symbols ................................................................................................................ 6
IQ8 Commercial Microinverters safety instruction ............................................................................ 7
1 Enphase IQ8 Commercial PV System ........................................................................................... 10
1.1 IQ8 Commercial Microinverters system components ........................................................ 10
2 IQ8 Commercial system design considerations ........................................................................... 12
2.1 IQ8 Commercial Microinverters ............................................................................................ 12
2.1.1 Module compatibility .................................................................................................................... 12
2.1.2 Enphase Frame Mount bracket ................................................................................................... 13
2.1.3 DC connector intermatability ..................................................................................................... 13
2.1.4 Number of microinverters per branch circuit ........................................................................... 14
2.1.5 Grounding considerations ........................................................................................................... 14
2.2 AC cable and accessories ...................................................................................................... 14
2.2.1 Three-phase QD Cable specifications, cable types, and ordering options ........................ 15
2.2.2 Design considerations for QD Cable selection ........................................................................ 16
2.2.3 Design considerations for QD accessories .............................................................................. 17
2.3 Design considerations for voltage rise ................................................................................. 19
2.3.1 Recommendations ........................................................................................................................ 19
2.3.2 IQ8 Commercial VRise for 208 VAC in QD Cable ................................................................... 20
2.3.3 Center tap connection scenarios .............................................................................................. 21
2.3.4 Advantages of center feeding QD Cable AC branch circuit................................................. 22
2.4 IQ Gateway Commercial 2 ..................................................................................................... 23
2.4.1 Wiring IQ Gateway Commercial 2 ENV2-IQC2-AM3-3P for three-phase applications .. 24
2.4.2 Design considerations for reliable PLC communications ..................................................... 24
2.4.3 Design considerations for sites with power export limit requirements ............................... 25
2.4.4 Multiple gateway systems ........................................................................................................... 26
2.5 Internet connection options .................................................................................................. 27
2.6 Installing IQ Gateway Commercial 2 in an outdoor enclosure ......................................... 27
2.7 Power line filters ....................................................................................................................... 27
2.7.1 400 A filter (SKU: QD-LCF-400-3P) ........................................................................................ 28

enphase IQ8 Specifications

General

Model	IQ8
Manufacturer	Enphase Energy
Efficiency	97.5%
Cooling	Natural convection
Warranty	25 years
Weight	2.2 lbs
AC Voltage	240 V
Frequency Range	60 Hz
Operating Temperature Range	-40°C to +60°C