# Integration docs

Canonical: https://edgetech.eu/docs

- [Modbus register map (EVSE-C-3x32A)](https://edgetech.eu/docs/modbus-registers.md): Complete Modbus RTU register map of the Edge charge controller, firmware 2.10.17. Address, name, size, unit and meaning for every register; state and error tables; the two registers a third-party controller needs.
- [Load balancing behaviour](https://edgetech.eu/docs/load-balancing.md): How Edge site controllers share the main connection between charge points. Per-second limits, the 6 A minimum and 8 A start threshold, failsafe on lost communication, site limit, solar modes and 1P/3P switching, with the configuration keys.
- [P1 telemetry](https://edgetech.eu/docs/p1-telemetry.md): What the EVSE-SC-02 reads from the DSMR/ESMR 5 smart meter P1 port, with OBIS codes, and what it needs from the port electrically. Also the fields the Matter P1 power meter exposes.
- [MQTT topics and message schema](https://edgetech.eu/docs/mqtt-topics.md): The device-plane MQTT contract between Edge site controllers and the platform. Topics per site, settings and config keys, the event types a site controller publishes, units, and the identifiers used.
- [REST API](https://edgetech.eu/docs/rest-api.md): Access to the site controllers through the EdgeTech backend over REST, for Home Assistant, DIY and integrations: status, control, schedules, solar modes, usage export. With a subscription. The public API surface, authentication and an OpenAPI file are being finalised.
- [evcc and Home Assistant](https://edgetech.eu/docs/evcc-home-assistant.md): Driving an Edge charge controller from evcc with the official smartevse template, and what that gives you in Home Assistant, Homey and Google Home. Wiring, template parameters, phase switching.
- [Installation and wiring](https://edgetech.eu/docs/installation.md): Practical installation rules for Edge charge controllers and site controllers. Bus cable, addresses, jumpers, DC leakage wiring, CT clamps, P1 connection, and the checks after power-up.
- [Firmware release notes](https://edgetech.eu/docs/firmware.md): Every site-controller and charge-controller release since the first production batch in March 2021, with what changed. Updates are installed over the air, for the site controller and, through it, the charge controller, with a subscription.
- [MCP server](https://edgetech.eu/docs/mcp.md): An MCP (Model Context Protocol) server that gives coding agents and assistants EdgeTech product specifications, the standards status, and a compatibility check for a site. Runs locally over stdio or as a hosted HTTP endpoint.
- [Downloads](https://edgetech.eu/docs/downloads.md): CE declarations, manuals, product briefs, wiring diagrams and brackets, in one indexed list. Everything here also exists as HTML on this site; the PDFs are a convenience, never the only source.