Table of Contents
Important Safety Information ......................................................................................................................... 4
Read this First .................................................................................................................................................. 4
Safety Instructions ........................................................................................................................................... 4
Audience .......................................................................................................................................................... 4
How the Microinverter Works ........................................................................................................................... 6
System Monitoring ....................................................................................................................................... 6
Optimal Reliability ........................................................................................................................................ 6
Ease of Design ............................................................................................................................................ 6
Compatibility and Capacity .............................................................................................................................. 7
Electrical Compatibility ................................................................................................................................ 7
Utility Service Requirements........................................................................................................................ 7
Branch Circuit Capacity ............................................................................................................................... 7
Parts and Tools Required ................................................................................................................................ 8
Enphase Equipment .................................................................................................................................... 8
Other Items .................................................................................................................................................. 8
Step 1: Connect the Envoy ............................................................................................................................ 10
Commissioning and Operation .................................................................................................................... 19
Energize the System ...................................................................................................................................... 19
Check the Envoy's progress .......................................................................................................................... 19
Build the Virtual Array .................................................................................................................................... 20
Troubleshooting .......................................................................................................................................... 21
Startup LED Operation: ............................................................................................................................. 21
Post-Startup LED Indications..................................................................................................................... 21
DC Resistance Low Fault .......................................................................................................................... 21
Other Faults ............................................................................................................................................... 21
Disconnect a Microinverter ............................................................................................................................ 24
Selecting Cable Type ..................................................................................................................................... 26
Connector Spacing Options ........................................................................................................................... 26
Cabling Length Options ................................................................................................................................. 27
Technical Data ............................................................................................................................................ 29
Technical Considerations ............................................................................................................................... 29
M250 Specifications ....................................................................................................................................... 29
Engage Cable Specifications ......................................................................................................................... 31
Enphase Installation Map ............................................................................................................................... 32
M250 Dimensions .......................................................................................................................................... 33
3
2013 Enphase Energy Inc.
M250 Installation and Operation
141-00022 Rev 01