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

HA Entity	Measurement
Inverter	string on-line/off-line/in-alarm
Generation Power	kW
Grid Consumption Power	kW
FeedIn Power	kW
Bat Discharge Power	kW
Bat Charge Power	kW
Solar Power	kW
Load Power	kW
Meter2 Power	kW
PV1 Current	A
PV1 Power	kW
PV1 Volt	V
PV2 Current	A
PV2 Power	kW
PV2 Volt	V
PV3 Current	A
PV3 Power	kW
PV3 Volt	V
PV4 Current	A
PV4 Power	kW
PV4 Volt	V
PV Power	kW
R Current	A
R Freq	Hz
R Power	kW
R Volt	V
S Current	A
S Freq	Hz
S Power	kW
S Volt	V
T Current	A
T Freq	Hz
T Power	kW
T Volt	V
Reactive Power	kVar
Energy Generated	kWh
Energy Generated Month	kWh
Energy Throughput	kWh
Grid Consumption	kWh
FeedIn	kWh
Solar	kWh
Load	kWh
Bat Charge	kWh
Bat Discharge	kWh
Bat SoC	% (single battery systems)
Bat SoC1	% (dual battery systems)
Bat SoC2	% (dual battery systems)
Inverter Bat Power	kW (negative=charging, positive=discharging)
Inverter Bat Power2	kW (dual battery systems
Bat Temperature	°C
Bat Temperature2	°C (dual battery systems)
Ambient Temp	°C
Boost Temp	°C
Inv Temp	°C
Residual Energy	kWh
minSoC	%
minSoC on Grid	%
Power Factor	%
API Response Time	mS
Running State	string 163: on-grid (see Table1)

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)