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Required System Components
You need the following components to install the C250 system:
•
Enphase C250 Microinverter: (model C250-72-2LN-S2 or C250-72-2LN-S5)
•
Enphase Envoy-C Communications Gateway: (model ENV-C250). The Envoy has a 250V-
rated, NEMA 6-15P plug. The receptacle must be NEMA 6-15R.
NOTE: The C250 Microinverter works only with the Envoy-C (model ENV-C250).
•
Enphase Engage Cable:
Model number
ET10-277-BULK
ET17-277-BULK
ET21-277-192-12AWG Landscape, 72-cell modules
For more information, see "Engage Cable Planning and Ordering" on page 32.
•
Transformer: The transformer must adapt the utility voltage (usually 480Y/277V) to no more
than 248V line-to-neutral for connection to the Envoy-C and C250 Microinverters.
•
Surge protection device(s).
•
Phase Coupler
•
Enphase Line Filters (model LCF-250-PC), for additional Envoys, if needed.
Other Items
•
Cable clips (model ET-CLIP-100)
•
Sealing caps, as needed (model ET-SEAL-10). One needed for each unused drop on the
Engage Cable.
•
Terminators, as needed (model ET-TERM-10). One needed at the end of each AC branch
circuit.
•
Enphase disconnect tool (model ET-DISC-05). You can substitute numbers 2 and 3 Phillips
screwdrivers.
•
Engage Couplers (splice kits), as needed. (ET-SPLK-05)
•
Commercial grade NEMA 6-15R receptacle required for each Envoy
•
Outdoor-rated, weather-proof AC junction box(es)
•
Gland or strain relief fitting (one per AC junction box)
•
Number 2 and 3 Phillips screwdrivers
•
Torque wrench, sockets, wrenches for mounting hardware
•
Adjustable wrench or open-ended wrench (for terminators)
•
Handheld mirror (to view LEDs on the undersides of the microinverters)
•
Laptop or mobile device for Envoy set up (recommended)
•
Bluetooth scanner for use with Enphase Installer Toolkit
13
PV module orientation
Portrait, 60- and 72-cell modules
Landscape, 60-cell modules
2015 Enphase Energy Inc. All rights reserved.
C250 System Installation and Operation
141-00025 Rev 03
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