Netzero - Powerwall 2 Diagnostics

Introduction

Netzero provides access to diagnostic data for your Powerwall 2 system. This data is not available in the Tesla app. The diagnostic data includes battery capacity and degradation, and solar string production (solar production broken down by strings of solar panels).

Credentials

Powerwall 2 diagnostics access requires the IP address and password for the Tesla Gateway or Powerwall+.

The IP address is usually pre-populated in Netzero, but if not, it should be listed with your other home network devices at your Wi-Fi access point or home router.

The default password consists of the last five letters of the Gateway password, which is printed on a label behind the Gateway door or Powerwall+ cover. For Tesla Gateway 2 systems, the label will say “Password” and the full password will consist of ten letters, of which you will only use the last five (note: this label is different from the label that contains the part number and serial number). For Tesla Gateway 1 systems, the password will be the last five letters or numbers of the serial number (note: see the Gateway 1 Password Reset Requirement section below for recent changes). For details, see Tesla’s documentation on Connecting to Tesla Gateway and Powerwall+ .

Access

Once you have the IP address and password, enter them in Netzero (Monitoring > Connect). Netzero will connect to the Gateway, collect diagnostic data, and display it in the Powerwall and Strings tabs.

Note: on iOS, Netzero will ask for permission to connect to the Local Network. The permission needs to be granted for the connection to succeed. If you ever rejected the permission, you can re-enable it from your device’s Settings menu: Settings > Apps > Netzero > Local Network.

Diagnostic Data

Powerwall Capacity

Like every lithium-ion battery, Powerwall will degrade over time and lose capacity. Netzero allows you to track the degradation over time. Refer to the Tesla documentation for warranty details on Powerwall 2.

String-level Data

If you have a Powerwall+, you will also get string-level data: current, voltage, and power for each string of arrays connected to your inverter. This can be useful for investigating production issues and finding issues with individual strings of solar panels.

Note: due to a Tesla limitation, only data for the first Powerwall+ inverter is available.

See Diagnosing Solar Production Issues for help with interpreting string-level data.

Troubleshooting

Accessing devices directly through your home network is not common and can run into issues. Additionally, Gateway firmware updates sometimes cause access issues.

Two of the most common types of issues when connecting to the Gateway are connectivity issues and authentication issues. Look at the error message displayed in Netzero to determine the type of issue:

• Connectivity issues will result in a Failed to connect error.
• Authentication issues will result in a Failed to authenticate error.

Connectivity Issues

To be able to connect to the Gateway, you have to:

• Be on the same home network as the Gateway. This generally means being on the same Wi-Fi network as the Gateway. You can confirm the name of the Gateway Wi-Fi network on the Monitoring > Powerwall screen (scroll down to the Network section). For your phone or tablet, confirm the Wi-Fi network in Settings > Wi-Fi. Note: if your Gateway is hardwired with Ethernet, it will need to be accessible from your Wi-Fi network.

• Enable the Local Network permission (device Settings > Apps > Netzero > Local Network).

• Have the correct IP address of the Gateway. Netzero will generally prefill the IP address with the correct value. You can confirm the IP address using your home network router: look for a device named Tesla Powerwall, LG Innotek, or a serial number such as 1232100-10-E--CN32132....

• One way to confirm connectivity independent of Netzero is to open the Gateway web address in a web browser. Using the same device and Wi-Fi network used for Netzero, open a web browser and navigate to https://192.168.1.10 (replace this IP address with your Gateway’s IP address). If the page loads, you will see a security error, which you can dismiss. If the page doesn’t load or keeps spinning, there’s a connectivity issue and you should try the solutions below.

If you’ve confirmed all the steps above and are still having connection issues, try the following steps:

1. Restart your Wi-Fi access point and/or home router. Sometimes they get into a bad state and prevent connections.
2. Restart your Gateway. Instructions for restarting. Note: only attempt Gateway restart when the grid is up.

Authentication Issues

Authentication issues mean the Gateway is accessible, but the password is incorrect. Confirm you have the correct password:

• For Gateway 2, the default password is the last 5 characters of the password shown on the label behind the Gateway door. The label will show a QR code, part number, serial number, and a password.
• For Gateway 1, the default password is the last 5 characters of the serial number shown on the label behind the Gateway door. NOTE: Tesla recently changed requirements for this password, so if you have a Gateway 1 and cannot log in, see the section below.
• If you ever changed the password in the past, you will need to use it instead of the default password.
• If all else fails, try resetting the password. See the sections below.

Gateway 1 Password Reset Requirement

Starting with firmware version 24.36.2, Tesla requires stronger passwords for Gateway 1 access (note: this does not affect Gateway 2). To access Gateway 1, you need to first reset the password, using the following procedure:

1. Using your phone, scan the QR code behind the Gateway 1 door. This will connect to the Gateway 1 TEG Wi-Fi network, using the full serial number as the password. Note: in some cases, the letter S has to be prepended to the full serial number as the Wi-Fi password.
2. Once connected to the TEG Wi-Fi network, open a web browser and navigate to https://192.168.91.1
3. Dismiss the security warnings, tap Continue at the bottom, scroll down and tap Upgrade Later at the bottom.
4. You will see a login screen. Tap Change or Forgot Password.
5. Select Forgot Password. For the current password, type the last 5 letters of the serial number. For the new password, choose a stronger password consisting of at least 8 characters, with a number and symbol. Don’t submit the new password yet.
6. Toggle the switch on the side of your Powerwall. Tesla’s documentation claims only one Powerwall needs to be toggled, however some users noted that all Powerwalls had to be toggled (so try that if the first approach doesn’t work).
7. Submit the new password.

Gateway 2 Password Reset

If you keep getting authentication failures despite using the correct password, you might need to reset the password:

1. Using your phone, scan the QR code behind the Gateway 2 door. This will connect to the Gateway 2 TEG Wi-Fi network.
2. Once connected to the TEG Wi-Fi network, open a web browser and navigate to https://192.168.91.1
3. Dismiss the security warnings, tap Continue at the bottom, scroll down and tap Upgrade Later at the bottom.
4. You will see a login screen. Tap Change or Forgot Password.
5. Select Forgot Password. For the current password, type the last 5 letters of the password on the gateway label. For the new password, choose a stronger password consisting of at least 8 characters, with a number and symbol. Don’t submit the new password yet.
6. Toggle the switch on the side of your Powerwall. Tesla’s documentation claims only one Powerwall needs to be toggled, however some users noted that all Powerwalls had to be toggled (so try that if the first approach doesn’t work).
7. Submit the new password.