> For the complete documentation index, see [llms.txt](https://docs.voltmasters.io/llms.txt). Markdown versions of documentation pages are available by appending `.md` to page URLs; this page is available as [Markdown](https://docs.voltmasters.io/device-integrations/battery-systems/frax.md). # Frax Our EMS supports battery systems from Frax. Frax supplies an integrated energy storage system that combines the power conversion system (PCS), battery management system (BMS) and on-board metering in a single managed unit. ### Supported devices * **Frax EMS**: integrated battery energy storage system The Frax system connects over **Modbus TCP** and is represented as a battery inverter (PCS) together with its battery management system, on-board PV and an energy meter. The **battery capacity is entered during device setup** — it is not read from the device — so make sure it is configured correctly. {% hint style="info" %} The Frax integration does not expose cumulative energy counters, so production and consumption totals are derived from live power measurements. {% endhint %} ### EMS functionality With the current integration, our EMS enables: * Monitoring of battery status and performance * Smart charging and discharging control * Optimization of self-consumption * Peak shaving and load balancing Additional functionality may be added over time as integration capabilities evolve. --- # Agent Instructions This documentation is published with GitBook. GitBook is the documentation platform designed so that both humans and AI agents can read, navigate, and reason over technical content effectively. Learn more at gitbook.com. ## Querying This Documentation If you need additional information that is not directly available in this page, you can query the documentation dynamically by asking a question. Perform an HTTP GET request on the current page URL with the `ask` query parameter, and the optional `goal` query parameter: ``` GET https://docs.voltmasters.io/device-integrations/battery-systems/frax.md?ask=&goal= ``` `ask` is the immediate question: it should be specific, self-contained, and written in natural language. `goal` is optional and describes the broader end goal you are ultimately trying to accomplish on behalf of the user. GitBook uses it to tailor the answer towards what is most useful for that goal. The response will contain a direct answer to the question and relevant excerpts and sources from the documentation. Use this mechanism when the answer is not explicitly present in the current page, you need clarification or additional context, or you want to retrieve related documentation sections.