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Contributing

Developing

Development environment

Developing evcc requires Go 1.23 and Node 22. We recommend VSCode with the Go, Prettier and Vetur extensions.

We use linters (golangci-lint, Prettier) to keep a coherent source code formatting. It's recommended to use the format-on-save feature of your editor. You can manually reformat your code by running:

make lint
make lint-ui

Changing device templates

evcc supports a massive amount of different devices. To keep our documentation and website in sync with the latest software the core project (this repo) generates meta-data that's pushed to the docs and evcc.io repository.

You can verify the generated meta-data by running:

make docs

Building from source

Install prerequisites (once):

make install-ui
make install

Build and run:

make
./evcc

Open UI at http://127.0.0.1:7070

To run without creating the evcc binary use:

go run ./...

Cross Compiling

To compile a version for an ARM device like a Raspberry Pi set GO command variables as needed, eg:

GOOS=linux GOARCH=arm GOARM=6 make

Publishing docker images

make docker DOCKER_IMAGE=my/docker DOCKER_TAG=0815

Debugging in VS Code

evcc Core

To debug a local evcc build in VS Code, add the following entry to your launch.json. You can adjust the referred configuration as needed to e.g. use your live configuration.

{
    "name": "Launch evcc local build with demo config",
    "type": "go",
    "request": "launch",
    "mode": "auto",
    "program": "${workspaceFolder}",
    "args": ["-c", "${workspaceFolder}/cmd/demo.yaml"],
    "cwd": "${workspaceFolder}",
},

UI

For frontend development start the Vue toolchain in dev-mode. Open http://127.0.0.1:7071/ to get to the live reloading development server. It pulls its data from port 7070 (see above).

npm install
npm run dev

Integration testing

We use Playwright for end-to-end integration tests. They start a local evcc instance with different configuration yamls and prefilled databases. To run them, you have to do a local build first.

make ui build
npm run playwright

Simulating device state

Since we don't want to run tests against real devices or cloud services, we've build a simple simulator that lets you emulated meters, vehicles and loadpoints. The simulators web interface runs on http://localhost:7072.

npm run simulator

Run an evcc instance that uses simulator data. This configuration runs with a very high refresh interval to speed up testing.

make ui build
./evcc --config tests/simulator.evcc.yaml

Adding or modifying translations

evcc already includes many translations for the UI. We're using Weblate to maintain translations. Feel free to add more languages or verify and edit existing translations. Weblate will automatically push all modifications to the evcc repository where they get reviewed and merged.

If you find a text that is not yet translatable in Weblate, you can help us by making it translatable. To do this, you can simply find the missing translation text in the code and apply similar changes as in these two Pull Requests:

Note: To ensure the build succeeds after creating new translations, make sure to include your new translations in both the de.toml and en.toml files.

Languages