User Manual

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. A 250A limit of the filter limits the communication domain to 72kW AC at

208Y/120V or 83kW AC at 240 delta. For communication domains larger than this, use an isolation

transformer to filter the communication domain.

Filtering with transformers

Utility transformers such as 480 delta to 240 high-leg delta transformers also provide noise filtering and

signal filtering between IQ Envoy communication domains. For a system with multiple IQ Envoys, it may be

most practical to distribute power at a higher voltage and then step down to the IQ System voltage at each

communication domain.

IQ Envoy Installation Options

For three-phase applications, the IQ Envoy should be procured as a stand-alone component, model ENV-IQ-

AM1-240 M. The IQ Envoy communicates with all of microinverters in a three-phase system. The production

CT and consumption CTs must not be enabled or installed.

Locate the IQ Envoy adjacent to the solar subpanel and wire it directly off that solar subpanel. The IQ Envoy

requires two hot conductors and one neutral conductor.

Installing IQ Envoy in an Outdoor Enclosure

The IQ Envoy must be installed inside of an electrical enclosure, keeping the operating temperature of the IQ

Envoy in mind. This enclosure must be large enough to house the IQ Envoy. If you use a power line bridge or

other networking component, make sure the enclosure can accommodate a receptacle. The enclosure can

be metal or non-metallic, but should be non-metallic if Wi-Fi or cellular networks are used for the IQ Envoy

Internet connection. The enclosure must meet the following requirements:

• Use a NEMA type 3R, 4, or better rated outdoor enclosure with hinged cover or screw cover of

suitable dimensions. Typical enclosure dimensions are in the range of 10” x 10” x 4” to 12” x 12” x 6”.

• Connect the IQ Envoy to two lines and a neutral. A neutral is required for powering the IQ Envoy. It

does not ship with a plug-in style power cord, so a receptacle is not required in the enclosure for

powering the IQ Envoy.

• Install a receptacle inside the enclosure if an Ethernet over power line communication (PLC) bridge

is desired. The enclosures listed below provide adequate room for a receptacle.

• Install the enclosure in a location that is shaded from extensive periods of direct sunlight. The IQ

Envoy is rated for ambient temperatures of -40°F to 115°F when installed in an enclosure.

• Do not drill holes on the top of the enclosure or anywhere that allows moisture ingress if the

enclosure is outdoors. If top entry is performed, a water-tight conduit hub, like a Myers Hub or other

suitable hub product must be used.

• Place in a location that is accessible to service personnel.