Enphase Envoy WiFi Setup — Reconnect to New Router
Changed your router, updated the WiFi password, or switched ISP — and now Enlighten shows your system as offline. The Envoy is still trying to connect to the old network. It needs reconfiguring to connect to the new one. The solar system keeps generating normally while the Envoy is disconnected — only the monitoring data stream is interrupted.
If you have tried the steps below and the Envoy still will not connect to your new WiFi network, we can guide you through the process remotely — or configure it for you if you have ethernet access available.
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6-step Envoy WiFi reconnection
Follow these steps to reconnect your Enphase Envoy to a new WiFi network after a router change, ISP switch, or password update.
Confirm the Envoy has lost its WiFi connection
Check the Envoy LED indicators. The network LED should be solid green when connected to the internet. If it is off, flashing, or amber, the Envoy has no internet connection.
Also check Enlighten — if the system shows as offline and the last data update was around the time you changed your router, the Envoy is still trying to connect to the old network. The solar system continues generating normally while the Envoy is disconnected.
Download the Enphase Installer Toolkit app
The Installer Toolkit app is the recommended method for reconfiguring Envoy WiFi. Download it from the Apple App Store or Google Play Store — search for "Enphase Installer Toolkit".
You need an Enphase account to log in. If you do not have one, create one using the email address associated with your Enlighten system. The app connects directly to the Envoy over its local AP mode network, so your phone does not need to be on your home WiFi to use it.
Put the Envoy into AP mode and connect your phone
Press the AP mode button on the Envoy — a small recessed button, usually on the side or bottom of the unit. Press and hold for about one second. The AP mode LED will begin flashing, indicating the Envoy is broadcasting its own WiFi network.
On your phone, go to WiFi settings and look for a network named ENVOY_ followed by the serial number. Connect to this network.
Your phone may warn that there is no internet — this is expected. You are connecting directly to the Envoy, not to the internet. Do not dismiss or switch back to your home WiFi until the setup is complete.
Configure the new WiFi network via the Installer Toolkit app
Open the Installer Toolkit app while connected to the Envoy AP network. The app should detect the Envoy automatically. Navigate to the network configuration section.
Select your new home WiFi network from the list of available networks. Enter the WiFi password carefully — the most common cause of failed reconnection is a mistyped password. Passwords are case-sensitive.
The Envoy will attempt to connect to your new router. If the connection succeeds, the network LED will turn solid green within a few minutes. If it fails, re-enter the password and try again.
Use ethernet as a fallback if WiFi will not connect
If the Envoy cannot connect to your WiFi — weak signal, incompatible settings, or repeated failures — connect it directly to your router with an ethernet cable. The Envoy has an ethernet port on the underside or rear panel.
Plug one end into the Envoy and the other into a spare LAN port on your router. The Envoy detects the wired connection automatically and prioritises it over WiFi. Ethernet is more reliable and eliminates intermittent monitoring gaps.
If the Envoy is too far from the router for a direct cable, a powerline ethernet adapter can bridge the distance using your home's electrical wiring. These cost around £30–40 and provide a permanent, reliable connection.
Verify Enlighten is receiving data again
After reconnecting, wait 15 to 30 minutes, then check Enlighten. The system should show as online and new production data should begin appearing. If the Envoy was offline for less than seven days, it will automatically backfill the missing data from its local buffer.
If Enlighten still shows no data after 30 minutes, check the Envoy network LED. Solid green means the connection is established and Enlighten may just need time to update. If the LED is not green, the WiFi connection was not established — repeat the setup process or switch to ethernet.
Why the Envoy does not reconnect automatically after a router change
When you replace your router or change your WiFi password, the Envoy loses its connection and cannot automatically discover the new network. Unlike a phone or laptop that prompts you to enter the new password, the Envoy has no screen and no way to ask. It continues trying to connect to the old network indefinitely until someone manually reconfigures it.
This is by far the most common reason for Enphase systems going offline in the UK. ISPs regularly send new routers when customers upgrade their broadband package, and the new router has a different network name and password. The homeowner sets up their phones and laptops on the new network but forgets the Envoy — because it is tucked away in a cupboard and the solar system keeps working regardless.
The system continues generating and the house continues using the solar power. The only thing that stops is the data upload to Enlighten. If you notice within seven days, the Envoy's local buffer will backfill the missing data when reconnected. After seven days, the data gap is permanent. For this reason, it is worth reconnecting the Envoy as soon as possible after any router change — and for long-term reliability, ethernet is always preferable to WiFi.
Common WiFi setup issues and solutions
Press and hold the AP mode button again for one second. Wait 30 seconds for the network to appear. If still not visible, try from a different phone. Some older Envoy models broadcast on 2.4GHz only — if your phone is set to 5GHz preferred, it may not see the network.
Double-check the password is correct — case-sensitive, no trailing spaces. If the router uses WPA3, the Envoy may not be compatible — switch the router to WPA2 or WPA2/WPA3 mixed mode. Some mesh routers require the 2.4GHz band to be enabled separately.
WiFi signal at the Envoy location is too weak to maintain a stable connection. Move the router closer, use a WiFi extender, or switch to ethernet. See our monitoring gap guide for more on intermittent connectivity.
Most Envoy models only support 2.4GHz WiFi. If your router broadcasts separate 2.4GHz and 5GHz networks, select the 2.4GHz network. If the router combines both bands under one name, the Envoy should connect to the 2.4GHz band automatically.
You need an Enphase account. If your installer set up the system under their account, you may need to create your own at enlighten.enphaseenergy.com. Some features require "homeowner" role access. If you are locked out, STS can help recover or transfer Enlighten access.
Envoy WiFi setup — common questions
Download the Enphase Installer Toolkit app. Press the AP mode button on the Envoy to broadcast its local WiFi network. Connect your phone to the ENVOY_ network. Open the app, navigate to network settings, select your new home WiFi, and enter the password. The Envoy will connect to your new router and resume uploading to Enlighten. If WiFi fails, connect the Envoy to your router with an ethernet cable instead.
AP mode (Access Point mode) is when the Envoy broadcasts its own temporary WiFi network so you can connect to it directly from your phone. You use AP mode to configure the Envoy's network settings — telling it which WiFi to connect to and providing the password. Activate it by pressing and holding the AP button for about one second. The AP network name is ENVOY_ followed by the serial number.
Yes — the Envoy has an ethernet port and will automatically prioritise a wired connection over WiFi. Ethernet is more reliable and eliminates monitoring gaps caused by signal dropouts. Connect an ethernet cable from the Envoy to a spare LAN port on your router. If the Envoy is too far away, use a powerline ethernet adapter to bridge the distance over your home's electrical wiring. These cost around £30–40 and provide a permanent, reliable connection.
Repeated disconnections are usually caused by weak WiFi signal at the Envoy location. The Envoy is often installed in a garage, loft, or utility cupboard where the signal is marginal. Other causes include router firmware updates that change settings, interference from neighbouring networks, or the router dropping idle devices. Switching to ethernet permanently resolves WiFi reliability issues.
Enlighten typically shows new data within 15 to 30 minutes of the Envoy reconnecting. If the Envoy was offline for less than seven days, it also backfills missing production data from its local buffer — this can take a few hours for a full week. Data beyond seven days is permanently lost. If Enlighten still shows nothing after 30 minutes, check the Envoy network LED is solid green.
Cannot get the Envoy to reconnect? We help remotely.
We guide you through the Envoy WiFi setup process step by step, troubleshoot connection failures, and configure ethernet alternatives if WiFi is unreliable at the Envoy location.