How it works in one minute
HACS
It was written in October 2026 from the integration's official documentation, but nobody in the Watt Budget community has followed it end to end on their car yet. Trying it? Tell me what works and what gets stuck.
(car's 4G)NissanConnect [EU]
(HACS integration)Home
Assistant
| What it is | A community integration that queries the NissanConnect Services servers like the app |
| Cost | Free |
| Data | Battery level, range, charging, plugged in, cabin temperature, mileage |
| Commands | Climate, start charging |
| Where it works | Anywhere, through the car's connection (Europe) |
| Depends on | Nissan's servers and your account |
What you need
- Home Assistant installed and reachable from your computer.
- HACS, the community store for Home Assistant extensions (installation explained on hacs.xyz).
- A NissanConnect Services app account (not the old “NissanConnect EV”) showing the car.
- A car sold in Europe: North America uses other servers, which aren't supported.
1Install the integration
- Install the integrationIn HACS, search for “NissanConnect [EU]”, click Download, then restart Home Assistant.
- Add itSettings → Devices & services → Add integration, search for NissanConnect, then enter the app's email and password.
- Set the frequencyBy default the integration only reads the data Nissan has cached, without waking the car. You can enable regular polling in the options, more frequent when the car is plugged in.
- Find the carThe car appears as a device under Settings → Devices & services → NissanConnect.
Early Leafs use the old “Carwings / NissanConnect EV” service. Home Assistant has an official integration for them (YAML configuration), but the 2G network shutdown stops many of these cars from communicating.
2The data you get
| Data | What it's for |
|---|---|
| Battery | Level in %, the value to give Watt Budget |
| Range | With and without climate on some models |
| Charging / plugged in | For an automation when you get home |
| Cabin temperature | On the Ariya, accurate only while climate runs |
| Mileage | For your stats |
| Climate | Start preheating before you leave |
Replace the long names with short ones, for example sensor.leaf_battery (Settings → Devices & services → Entities → the entity → cog). Your cards, automations and Watt Budget settings will be much easier to read.
3Connect Watt Budget
The sensor to enter in Watt Budget, under Settings › Home Assistant: the Battery sensor (in %) of the NissanConnect device.
Once connected, Watt Budget reads the level every minute: no more typing the starting percentage, and the charge is worked out from the real battery level.
The four steps (HTTPS access, token, sensors, check) are explained on the guides home page and in the Watt Budget guide.
4Precautions
- Regular polling wakes the car: the integration drops back to a slow rhythm by itself if the car stays plugged in without charging.
- Nissan's servers only return cached values until the car has been used or woken.
- Unofficial integration: the manufacturer can change its app and break it overnight. Keep the official app on your phone.
- Don't shorten the update interval: each query can wake the car and drain its 12 V battery. The defaults are a good balance.
- Your credentials stay in your Home Assistant; neither Watt Budget nor I can see them.
Frequently asked questions
My Ariya's range stays “unknown”. Why?
Some models don't always report it. The battery level is enough for Watt Budget.
What about the electric Townstar?
Owners have added it, but its battery level doesn't always come through. Your feedback is welcome.
Does Watt Budget get access to my car?
No. Watt Budget only reads the battery level sensor in your Home Assistant, from your browser, with the token you give it. It never sees your manufacturer login or the car's location.
My model isn't listed. Can it work?
Often yes: these integrations go through the manufacturer's app, shared across the range. The easiest is to try, then tell me how it went via the contact page.
Links and thanks
Thanks to dan-r, author of NissanConnect for Home Assistant, and to mitchellrj and Tobiaswk for their work on Nissan's API.
Does your car reach Home Assistant another way? Share your method: the next guides will follow your feedback.
The other Home Assistant guides
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