User Manual

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. The Hammond 170 Auto line of auto-transformers is affordable and

immediately available in sizes starting at 50 watts. The 170A, 170B, and 170C are all listed by CSA. The

Envoy is less than three watts, so the smallest auto-transformer in the Hammond 170 Auto line is sufficient.

More information is available at http://www.hammondmfg.com/168.htm

240V Delta (with No Neutral) Electrical Service Conceptual Schematic

240V Delta (With No Neutral) Electrical Schematic