enphase M250 User Manual

M-Series Microinverter Installation and Operation
 2016 Enphase Energy. All rights reserved. 141-00024 Rev 02b
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Voltage Type and Conductor Count Options
The voltage types are either single-phase or three-phase. All Engage Cable connectors bear labels
indicating the voltage designation. Single-phase (230 Vac) Engage Cable includes three conductors.
Three-phase (400 Vac) Engage Cable includes five conductors. Because Enphase microinverters output
onto one phase, the 400 Vac Engage Cable balances the phases by rotating conductor use from one
microinverter to the next as shown on page 22.
Cabling Length Options
Engage Cabling is available in shorter lengths with 30-40 connectors, depending upon voltage type.
Longer lengths can be ordered and cut to suit per order. Cable is also available with C2 rating. Ordering
options include:
Model Number
Voltage/
conductors
Connector
count
Connector
spacing
PV module
orientation
ET10-230-40
ET10-230-40-C2
230 Vac,
3 conductors
40
1.025 m (40”)
Portrait
ET10-230-BULK
ET10-230-BULK-C2
230 Vac,
3 conductors
240
1.025 m (40”)
Portrait
ET10-400-30
ET10-400-30-C2
400 Vac,
5 conductors
30
1.025 m (40”)
Portrait
ET10-400-BULK
ET10-400-BULK-C2
400 Vac,
5 conductors
240
1.025 m (40”)
Portrait
ET17-230-40
ET17-230-40-C2
230 Vac,
3 conductors
40
1.7 m (67”)
Landscape
ET17-230-BULK
ET17-230-BULK-C2
230 Vac,
3 conductors
240
1.7 m (67”)
Landscape
ET17-400-30
ET17-400-30-C2
400 Vac,
5 conductors
30
1.7 m (67”)
Landscape
ET17-400-BULK
ET17-400-BULK-C2
400 Vac,
5 conductors
240
1.7 m (67”)
Landscape
ET21-230-192-2.5mm
230 Vac,
3 conductors
192
2.11 m (83”)
Landscape
ET21-400-192-2.5mm
ET21-400-192-C2-2.5mm
400 Vac,
5 conductors
192
2.11 m (83”)
Landscape
Planning for Cable Lengths and Type
The Cabling System is flexible enough to adapt to almost any solar design. To determine the length and
cable type that you need, apply the following considerations:
 Account for the number of Enphase Microinverters to be installed on the AC branch
circuit. Make sure to allocate the correct number of connectors, including extra connectors for
gaps and turns.
 Plan for additional cable length to reach from the AC branch circuit junction box to the
first microinverter. If greater than half a connector interval is needed, you may need to allow for
one (or more) unused connectors in order to span this distance. You must cover unused
connectors with Enphase watertight sealing caps.

enphase M250 Specifications

General

Model	M250
Manufacturer	Enphase Energy
Efficiency	96.5%
Output Voltage	240 V
Operating Temperature Range	-40°C to +65°C
Maximum Output Current	1.04 A
CEC Efficiency	96.0%
Start-up Voltage	22 V
Output Frequency	60 Hz
Enclosure Rating	IP67
Weight	1.6 kg