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Planning for System Installation
The Enphase Microinverter is compatible with most 60- and 72-cell PV modules and installs quickly and
easily. It ships with integrated DC and AC cables and connectors. The DC connectors attach to the PV
module, while the AC connector attaches directly to the Engage Cable. No additional cabling is needed.
The Engage Cable for C250 is available in three connector spacing options to meet varying site
requirements. For Engage Cable ordering information, see "Engage Cable Planning and Ordering" on
page 32.
Compatibility and Capacity
Refer to the Enphase Compatibility Calculator at:
http://enphase.com/module-compatibility-calculator-m250-update/
compatibility. To ensure mechanical compatibility, be sure to order the correct connector type for both
microinverter and PV module from your distributor.
WARNING: Risk of fire. When connecting to a C250 Microinverter, the PV module DC
conductors must be labeled "PV Wire" or "PV Cable" to be compliant with NEC 690.35(D)
for Ungrounded PV Power Systems.
Compatibility
Model Number
C250-72-2LN-S2
C250-72-2LN-S5
Branch Circuit Capacity
Plan your AC branch circuits to meet the following limits for maximum number of Enphase Microinverters
per branch when protected with a 20-amp over-current protection device (OCPD).
Maximum C250s
Utility Service Requirements
When used with a transformer, the Enphase C250 Microinverter works with three-phase 480Y/277V
service. Install an auto-transformer or isolation transformer so that the voltage presented to the
microinverter is limited to no more than 248V, line to neutral.
11
Works with PV Module Type
60-cell or 72-cell, to 350 W
60-cell or 72-cell, to 350 W
per phase
16
2015 Enphase Energy Inc. All rights reserved.
C250 System Installation and Operation
to ensure PV module electrical
PV Module Connector Type
MC-4 locking connector
Amphenol connector
Maximum C250s
per AC branch circuit
48
141-00025 Rev 03
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