# ETM PowerSync

**Local HEMS for solar PV, heat pump and EV charging installations.** ETM PowerSync
coordinates photovoltaics, battery, heat pump and EV charger under a single optimisation
logic — running at your site, on your hardware, with no cloud dependency.

Built on [nymea.io](https://nymea.io), following an **Open Core** architecture: a free
foundation (GPL-3.0) and a proprietary optimisation layer.

!!! info "Honest statuses"
    Every feature shows its real state: <span class="badge stable">STABLE</span>
    in production · <span class="badge testing">IN PROGRESS</span> being industrialised ·
    <span class="badge nightly">ROADMAP</span> planned. We do not document a promise.

## Where to start

- [Installation](installation/index.md) — deploy ETM PowerSync from the APT repository
- [Features](fonctionnalites/index.md) — what the HEMS does, and its real state
- [Compatibility](appareils/compatibilite.md) — supported equipment
- [Integrations](integrations/jsonrpc-api.md) — JSON-RPC API, MQTT, Home Assistant

## Links

- Product site: [etm-powersync.fr](https://etm-powersync.fr)
- Source code: [github.com/etmschurig](https://github.com/etmschurig)