How To Identify An Interfering Load; The Envoy Is In A Circuit On The Primary Load Center, The Solar Circuits Are On A Downstream Subpanel; The Envoy Is In A Circuit On The Primary Load-Center, The Solar Circuits Are On A; Downstream Subpanel - enphase M250 Troubleshooting Manual

 The LCD displays Device Scan Active, and the Envoy begins a 30-minute scan (if a longer
scan is not already in progress) to identify all of the microinverters deployed at the site.

Alternatively, if you have an installer account, you can use Enlighten to start a new device scan:
 Log into Enlighten, select the site, and click the Settings (
 Click the Status tab in the information pane on the right.
 Click the Envoy serial number.
 Click the Rescan for Devices button.

How to identify an interfering load

If you are unable to resolve the power line communication issue after completing the previous
troubleshooting steps, inspect the load center one circuit breaker at a time. Identify the source of
interference. If there is no subpanel, follow these steps to identify which circuit has the interfering load or
loads.
1. Turn off all circuit breakers except those for the PV array and for the Envoy.
2. Verify that the Envoy and microinverters are communicating.
3. Turn on one additional circuit breaker and wait 10 minutes to see if there is any interference.
4. If not, turn on another circuit breaker and check again.
After completing these steps to find out which circuit has the interfering load, look at the individual loads
on that circuit to determine which device is causing the interference.
The Envoy is in a circuit on the primary load center, the solar circuits are on a

downstream subpanel

If the primary load center is full with no more capacity to add circuit breakers
for solar, add a subpanel. A subpanel is similar to another, "mini" load center
with a small subset of circuit breakers. In these cases, it is best
to add an additional 5-Amp circuit breaker and then run an
outlet off of that subpanel. Plug the Envoy into that outlet, so
that it is close to the PV circuit breakers.
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 2014 Enphase Energy Inc.
Troubleshooting an Enphase System
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August 2014