enphase M250 Troubleshooting Guide

Troubleshooting an Enphase System
 2014 Enphase Energy Inc. August 2014
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Table of Contents
Important Safety Information ......................................................................................................................... 5
Read this First .................................................................................................................................. 5
Product Labels ................................................................................................................................. 5
Safety and Advisory Symbols .......................................................................................................... 5
Safety Instructions ............................................................................................................................ 5
General Safety ............................................................................................................................................. 5
Microinverter Safety ..................................................................................................................................... 6
Engage Cable and Accessory Safety .......................................................................................................... 7
Overview ....................................................................................................................................................... 8
Troubleshooting Topics ................................................................................................................................. 9
Envoy and Communications Issues ............................................................................................................ 11
Envoy Issues .................................................................................................................................. 11
A physical Ethernet connection is not practical at the site ......................................................................... 11
LCD is completely blank ............................................................................................................................ 12
LCD displays “Reset Clock” ....................................................................................................................... 12
LCD displays “Envoy Failure” .................................................................................................................... 12
LCD displays "Scanning Inhibited" ............................................................................................................ 12
Networking and Internet Issues ..................................................................................................... 13
Issue: Wireless Adapter Wi-Fi Problems ................................................................................................... 13
Issue: How Set Up Wi-Fi without Wi-Fi WPS ............................................................................................. 13
LCD shows a non-routable/self-assigned IP address AND shows “-Web” ................................................ 15
The Envoy is using a static IP and cannot get a web connection .............................................................. 17
LCD periodically shows “-Web” for minutes or hours at a time. ................................................................. 17
LCD shows a valid IP, but also shows “-Web” ........................................................................................... 17
The router or DSL modem at the site has only one Ethernet port .............................................................. 17
Internet service is not available on site ...................................................................................................... 18
Are my power line communication bridges working? ................................................................................. 19
Issue: Internet Traffic is Slower After Installing a Bridge ........................................................................... 19
Asoka PL9650 ....................................................................................................................................... 19
Asoka PL9660-Q1 ................................................................................................................................. 19
ReadyNet EN200 .................................................................................................................................. 19
Tenda P200 .......................................................................................................................................... 20
The Envoy cannot get a “+Web” even though all premises networking is intact ........................................ 20
Can I use a dial-up Internet connection with the Envoy? ........................................................................... 20
Power Line Communication Issues between the Envoy & Microinverters ..................................... 21
Microinverters are not detected, or, power line communication level is low or poor .................................. 22
How to identify an interfering load ............................................................................................................. 24
The Envoy is in a circuit on the primary load center, the solar circuits are on a downstream subpanel .... 24
Power line communications with a Line-side Tap (or Supply-Side, or PLC) Installation ............................ 25
Multiple Envoys and Filtering ..................................................................................................................... 25
Using a Transformer to Isolate Communication Domains ......................................................................... 25
Using an Aftermarket Filter to Isolate Communication Domains................................................................ 26
How to Get Training on Enphase Power Line Communication .................................................................. 26

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