enphase M250 Troubleshooting Guide

Troubleshooting an Enphase System
 2014 Enphase Energy Inc. August 2014
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ACVOOR (AC Voltage Out of Range)
The microinverter reports that the AC voltage coming from the utility is either too low or too high as
specified by UL standards (UL1741). Acceptable ranges for AC service are shown in the table below:
240 Volt AC Split Phase
208 Volt AC Three Phase
L1 to L2
211 to 264 VAC
L1 to L2 to L3
183 to 229 VAC
L1, L2 to neutral
106 to 132 VAC
L1, L2, L3 to neutral
106 to 132 VAC
An ACVOOR condition should correct itself, as there are often periodic variations in Utility voltage. If the
condition persists, troubleshoot as follows.
ACVOOR in an entire branch or multiple branches
Checks:
1. Measure voltages for L-L and L-N for all phase conductors at the service entrance (PCC), at each
Enphase branch circuit breaker, at each Enphase branch circuit junction box, at each Enphase
branch circuit AC pigtail (if used in this installation), and at the last microinverter of each Enphase
branch circuit.

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