FoxESS and Home Assistant integration 🏡 ☀

⚙️ Installation & ♻️ Update

Use hacs.io to manage the installation and update process. Right now this integration is part of HACS by default - no more neeed to add it by custom repositories 🥳

⌨️ Manual installation

Create the folder called foxess in /homeassistant/custom_components

Copy the content of this integrations custom_components/foxess folder into your HA /homeassistant/custom_components/foxess folder

💾 Configuration

Edit your home-assistant /configuration.yaml and add:

sensor:
  - platform: foxess
    deviceID: enter_your_inverter_id
    deviceSN: enter_your_inverter_serial_number
    apiKey: enter_your_personal_api_key

Auxiliary notes:

• username & password are no longer required for this integration, it uses your_personal_api_key instead.

• your_inverter_serial_number is the serial number of the inverter this integration will be gathering data from, you can see the deviceSN by logging into the Foxesscloud.com website, in the left hand menu click on 'Device', then 'Inverter' this will display a table and your Inverter SN - the format will be similar to : 60BHnnnnnnXnnn - copy and paste this into the config setting deviceSN: replacing the text foxesscloud_inverter_serial_number

• your_personal_api_key is a personal api_key that is generated in your profile selection of your Foxesscloud account. To do this log into the Foxesscloud.com website, click on the 'profile icon' in the top right corner and select 'User Profile'. Then on the menu on the left hand side select 'API Management' and click 'Generate API Key, the long string that it generates should be copied and pasted into the platform config setting of your configuration.yaml apiKey: replacing the text foxesscloud_personal_api_key (see example above).

• your_inverter_id ⚠️ Please note the inverter_id requirement has changed and the deviceID is only required for legacy installations installed prior to the OpenAPI being introduced, for these older installations do not remove it as it will affect your entity history and follow the notes for legacy installations below.

  For new 'OpenAPI' installations, follow these instructions:

  For all new OpenAPI installs (since March 2024) simply re-use your unique inverter_serial_number deviceSN: in the deviceID: (i.e. you would enter your inverter serial number in both of these fields) i.e. it would look like this:

  sensor:
   - platform: foxess
     deviceID: enter_your_inverter_serial_number
     deviceSN: enter_your_inverter_serial_number
     apiKey: enter_your_personal_api_key

  For legacy installations only you must continue to use the inverter_id as it sets the unique_id for the entities and it will delete your entity history if it is changed. It can be found in the UUID on the foxesscloud in the url path of the Inverter Details page; make sure that this is exact value from inverter details page address between the %2522 and %2522 characters:

• Fox R series or inverters with more than 6 PV strings - if you have an inverter that supports more than 16 PV strings, please add the following switch extendPV: true to your platform config and the integration will attempt to read PV strings 7-18 volts, current power sensors.

     deviceID: enter_your_inverter_serial_number
     deviceSN: enter_your_inverter_serial_number
     apiKey: enter_your_personal_api_key
     extendPV: true

• Multi-inverter support - if you have more than one FoxESS device in your installation, you can leverage the optional name field in your config,

  sensor:
   - platform: foxess
     name: Fox1
     deviceID: enter_your_inverter_id_1
     deviceSN: enter_your_inverter_serial_number_1
     apiKey: enter_your_personal_api_key_1
   - platform: foxess
     name: Fox2
     deviceID: enter_your_inverter_id_2
     deviceSN: enter_your_inverter_serial_number_2
     apiKey: enter_your_personal_api_key_2

📊 Provided entities

Table1 Possible Running States Running State |---------| 160: self-test 161: waiting 162: checking 163: on-grid 164: off-grid 165: fault 166: permanent-fault 167: standby 168: upgrading 169: fct 170: illegal

💡 If you want to understand energy generation per string check out this wiki article

🤔 Troubleshooting

API Error summary:

• {"errno":41930,"result":null} ⟶ incorrect inverter id
• {"errno":40261,"result":null} ⟶ incorrect inverter id
• {"errno":41807,"result":null} ⟶ wrong user name or password
• {"errno":41808,"result":null} ⟶ token expired
• {"errno":41809,"result":null} ⟶ invalid token
• {"errno":40256,"result":null} ⟶ Request header parameters are missing. Check whether the request headers are consistent with OpenAPI requirements.
• {"errno":40257,"result":null} ⟶ Request body parameters are invalid. Check whether the request body is consistent with OpenAPI requirements.
• {"errno":40400,"result":null} ⟶ The number of requests is too frequent. Please reduce the frequency of access.

Increase log level in your /configuration.yaml by adding:

logger:
  default: warning
  logs:
    custom_components.foxess: debug

FoxESS Open API Access and Limits

FoxESS provide an OpenAPI that allows registered users to make request to return datasets.

The OpenAPI access is limited and each user must have a personal_api_key to access it, this personal_api_key can be generated by logging into the FoxESS cloud wesbite - then click on the Profile Icon in the top right hand corner of the screen, select User Profile and then from the menu select API Management, click the button to 'Generate API Key' - this long string of numbers is your personal_api_key and must be used for access to your systems details.

The OpenAPI has a limit of 1,440 API calls per day, after which the OpenAPI will stop responding to requests and generate a "40400" error.

This sounds like a large number of calls, but bear in mind that multiple API calls have to be made on each scan to gain the complete dataset for a system.

The integration paces the number of API calls that are made, with the following frequency -

• Site status and plant details - every 15 minutes
• Real time variables - every 5 minutes
• Cumulative total reports (generation, feedin, gridConsumption, BatterychargeTotal, Batterydischargetotal, home load) - every 15 minutes
• Daily Generation report (Daily Energy Generated - 'total yield') - every 60 minutes
• Battery minSoC settings - every 60 minutes

The integration is using approximately 22 API calls an hour (528 a day and well within the 1,440).

If you have multiple inverters in your account, you will receive 1,440 calls per inverter, so for 2 inverters you will have 2,880 api calls.

📚 Usefull wiki articles

• Understand PV string power generation using foxess ha
• Sample sensors for better solar monitoring
• How to fix Energy Dashboard data (statistic data)