Auto-Transformer Ordering Guide for Enphase C250 Microinverter Systems

This brief discusses the use of auto-transformers with Enphase C250 Microinverters in commercial applications for interconnection to wye (Y) configuration three-phase utility services, such as 480Y/277 V or 208Y/120 V.

For C250 Microinverter projects where the utility service is a three-phase delta (Δ) configuration, you must use an isolation transformer and not an auto-transformer. Refer to the Enphase C250 Commercial Design Guide for details. 

Related Categories: Microinverter