Interconnecting Iq8D Microinverters To Other Voltages; Transformer Specification (Table Of Various Voltage Configurations); Figure 17: Transformer; Table 14: Transformer Specifications Various Voltage Configuration - enphase IQ8D-72-E-US Design Manual

Interconnecting IQ8D Microinverters to Other Voltages

Enphase IQ8D Microinverter supports grid interconnection for 208V/120V three phase applications. For interconnection to
system voltages other than 208V/120V three-phase, a transformer is required to connect to the grid. This application note
provides brief guidelines for interconnecting IQ8D with different grid voltages.
Specify the transformer kVA size to meet the inverter output in kW AC. Some additional deratings, such as adjustments
for power factor and temperature may apply. Refer to the transformer manufacturer's specifications for transformer
sizing. The transformer's primary connection must match that of the
grid configuration at the site, and its secondary connection should be
208/120V WYE configuration for IQ8D System.
The following Table 1 lists utility voltage values and transformer
requirements. Consult transformer manufacturer for appropriate
sizing and loss analysis for the system. Also refer to AHJ
requirements in your region for transformer installations.
Installers can choose transformers with adjustable taps. Use the
tap to make minor adjustments when the utility-provided voltage is
high or when optimizing conductor sizing versus expected voltage
rise for the value engineered PV system. It is common to specify
high-efficiency or ultra-high efficiency, general purpose, dry-type
transformers for an Enphase Microinverter System.

Transformer Specification (Table of Various Voltage Configurations)

Utility Voltage
Configurations
208V/120V WYE
480V/277V WYE
Configuration
480V DELTA Configuration
600V/347V WYE
Configuration
600V DELTA Configuration
240V High Leg DELTA
Configuration
NOTE: Transformer procurement, installation, maintenance, and support are the responsibility of the installer. Damage to the IQ8D
Microinverter due to incorrect transformer installation will render the Enphase warranty invalid.
NOTE: Enphase IQ8D system interconnection using transformer for grid voltage other than 208V/120V is not compliant under IEEE
1547:2018 standards. Installer should install IQ8D system with transformer only when the system meets all the correct compliance
standards applicable for your AHJ.
© 2022 Enphase Energy Inc. All rights reserved.
Nominal Voltage Nominal Voltage
L - L L - N/G
208V
480V
480V
480V
600V
240V

Table 14: Transformer specifications Various Voltage Configuration

Transformer requirements
120V No transformer required for interconnection
Specify 480V WYE to 208V WYE transformer
277V
Specify 480V DELTA to 208V WYE transformer
-
Specify 600V WYE to 208V WYE
347V
transformer configuration
Specify 600V DELTA to 208V WYE transformer
-
Specify 240V DELTA to 208V WYE transformer
-
IQ8D-DG-MKT-00397-02-EN-US-2022-06-10

Figure 17: Transformer

configuration
configuration
configuration
configuration
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