What do I need to run evcc?

A small always-on computer at home — a Raspberry Pi, a NAS, or any machine that runs Docker — and a wallbox or smart plug evcc supports. The car itself is optional: evcc can read its state of charge through the manufacturer's connected-car account, but charging control comes from the charger. Plug-in hybrids work fine on a supported smart plug.

Why not use evcc's ENTSO-E or Elering tariff directly?

Those return the raw day-ahead exchange price. Your actual cost adds the grid fee, which on many tariffs is much lower at night, plus excise, levies and VAT. Elewatt computes that all-in price for your specific contract, so evcc ranks hours by what you really pay.

Is the feed URL secure?

The URL contains a 32-character random token and nothing else identifies you. It serves prices only — no account data. If it leaks, press New URL in Elewatt: the old address stops working immediately and you paste the new one into evcc.

How often does it update, and when does tomorrow appear?

evcc polls the feed on its own schedule, typically every few minutes, and Elewatt caches the response for five minutes. Tomorrow's slots appear as soon as the exchange publishes day-ahead prices, usually early afternoon Central European time.

Are the slots 15 minutes or hourly?

Whatever your market publishes. Most Elewatt markets trade in 15-minute slots; a few are hourly. evcc handles both, and you can add the average feature flag in evcc to smooth 15-minute slots into hourly values if you prefer.

Does a feed count as a device on my plan?

Yes, one device per feed. evcc decides when your car charges, so the feed saves money like any other automated device. The Free plan includes one device.

evcc dynamic tariff from Elewatt: charge cheap

evcc

evcc is the open-source charging controller that decides when your wallbox charges. Give it Elewatt's price feed and it plans charging around your real electricity cost — spot price plus grid fee, taxes and VAT for your own contract — instead of raw market prices.

Reedik Lindau

Published 22 September 2026

What you get

All-in price: spot, grid fee, taxes, VAT

Today and tomorrow in 15-minute slots

Per contract: day/night grid tariffs included

evcc pulls it — nothing to install

Secret URL you can rotate any time

EUR per kWh, ready for evcc's planner

What evcc is

evcc runs at home on a Raspberry Pi, a NAS or in Docker and sits between your wallbox, your electricity meter and, optionally, your car. It supports hundreds of chargers and most car brands through their connected-car accounts. With a dynamic tariff configured, its planner charges in the cheapest hours before your departure time, or only below a price limit you set. The tariff is just a list of price slots — and that list can come from Elewatt.

Why not evcc's built-in market tariffs?

evcc ships tariff sources for ENTSO-E, Elering, Tibber and others, but they deliver the raw exchange price. What you pay per kWh also includes your grid operator's fee, which is often cheaper at night, plus excise, levies and VAT. In many markets the grid fee swings the ranking of hours more than the spot price does. Elewatt already computes that final price for your contract, and the feed hands it to evcc slot by slot.

The snippet you paste

Elewatt generates this for each feed with your own URL filled in. Paste it under the top-level tariffs section of evcc.yaml, remove any existing grid tariff, and restart evcc.

tariffs:
  currency: EUR
  grid:
    type: custom
    features:
      - cacheable
    forecast:
      source: http
      uri: https://elewatt.eu/api/evcc/feed/<your-token>

Set up in five steps

About five minutes if evcc is already running. The feed is tied to one of your Elewatt contracts, so add the contract first if you have not.

Add a feed in Elewatt

Open Connections, then evcc, and press the plus button. Give the feed a name such as Garage wallbox and pick the contract whose prices it should carry. Each feed counts as one device on your plan.

Copy the URL or the ready snippet

The editor stays open after saving and shows the feed URL and a ready-made evcc.yaml block with your URL already inside. Copy whichever you prefer. The New URL button issues a fresh secret if you ever need to revoke the old one.

Paste into evcc.yaml and restart

Put the block under the top-level tariffs section. If evcc already has a grid tariff, replace it — evcc accepts only one. Keep currency set to EUR, then restart evcc.

Check the price in evcc

Open the evcc web interface. The current grid price appears in the header and the tariff chart shows today's and tomorrow's slots. The numbers should match the chart on your Elewatt evcc page, since both come from the same calculation.

Let the planner choose the hours

Set a charging plan such as 20 kWh by 07:00, or a price limit under Cheap grid charging. evcc marks the cheapest slots from the feed and charges in them. Back in Elewatt, the feed row shows when evcc last polled.

Charge your car on your real cheapest hours

Free to start. One feed is included on the Free plan; it takes a minute to add.

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