Technical data

M250 Installation and Operation
 2013 Enphase Energy Inc. 141-00022 Rev 01
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Table of Contents
Important Safety Information ......................................................................................................................... 4
Read this First .................................................................................................................................................. 4
Safety Instructions ........................................................................................................................................... 4
Audience .......................................................................................................................................................... 4
The Enphase Microinverter System .............................................................................................................. 5
How the Microinverter Works ........................................................................................................................... 6
System Monitoring ....................................................................................................................................... 6
Optimal Reliability ........................................................................................................................................ 6
Ease of Design ............................................................................................................................................ 6
Planning for Microinverter Installation ........................................................................................................... 7
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
Lightning and Surge Suppression .................................................................................................................... 8
Enphase Microinverter Installation ................................................................................................................ 9
Step 1: Connect the Envoy ............................................................................................................................ 10
Step 2: Install the AC Branch Circuit Junction Box ........................................................................................ 11
Step 3: Plan, Cut, and Position the Engage Cable ........................................................................................ 12
Step 4: Attach the Microinverters to the PV Racking ..................................................................................... 13
Step 5: Dress the Engage Cable ................................................................................................................... 14
Step 6: Connect the Microinverters ................................................................................................................ 15
Step 7: Terminate the Unused End of the Engage Cable .............................................................................. 16
Step 8: Connect the Engage Cable to AC Junction Box(es) .......................................................................... 17
Step 9: Complete the Installation Map ........................................................................................................... 18
Step 10: Connect the PV Modules ................................................................................................................. 18
Commissioning and Operation .................................................................................................................... 19
Energize the System ...................................................................................................................................... 19
Check the Envoy's progress .......................................................................................................................... 19
Configure the Grid Profile (optional) .............................................................................................................. 19
Build the Virtual Array .................................................................................................................................... 20
Troubleshooting .......................................................................................................................................... 21
Status LED Indications and Error Reporting .................................................................................................. 21
Startup LED Operation: ............................................................................................................................. 21
Post-Startup LED Indications..................................................................................................................... 21
DC Resistance Low Fault .......................................................................................................................... 21
Other Faults ............................................................................................................................................... 21
Troubleshoot an Inoperable Microinverter ..................................................................................................... 22
Disconnect a Microinverter ............................................................................................................................ 24
Install a Replacement Microinverter ............................................................................................................... 25
Engage Cable Planning and Ordering Information ..................................................................................... 26
Selecting Cable Type ..................................................................................................................................... 26
Connector Spacing Options ........................................................................................................................... 26
Voltage Type and Conductor Count Options ................................................................................................. 27
Cabling Length Options ................................................................................................................................. 27
Planning for Cable Lengths and Type ............................................................................................................ 27
Technical Data ............................................................................................................................................ 29
Technical Considerations ............................................................................................................................... 29
M250 Specifications ....................................................................................................................................... 29
Engage Cable Specifications ......................................................................................................................... 31
Enphase Installation Map ............................................................................................................................... 32
M250 Dimensions .......................................................................................................................................... 33
Sample Wiring Diagram: M250, 240 VAC ...................................................................................................... 34
Sample Wiring Diagram: M250, 208 VAC ...................................................................................................... 35