Fenecon FEMS & OpenEMS for Home Assistant (Marketplace integration)

Installs: 342 sharing analytics
GitHub stars: 65
Connection: Works locally
Upkeep: Updated in the last 6 months
Version: v1.8.0, October 25, 2026
Category: Energy, Meters and monitoring
Kind: Marketplace integration
Needs: Needs the Marketplace (HACS on 2026.10 and older)
Domain: openems
Source: github.com/Lamarqe/ha_openems
Issues: Report an issue

Independent directory, made by the developer of Vulpo. Not affiliated with Home Assistant or the Open Home Foundation.

Screenshots From the README of Lamarqe/ha_openems.

About

Fenecon FEMS & OpenEMS is an integration that connects Home Assistant to Fenecon FEMS and OpenEMS energy systems. It talks to the system locally and is set up in the UI with the host, a username and password, and a connection type, with a custom websocket URL available for non-standard setups. Backend components appear as service devices and their channels as entities, covering sensors, switches, numbers, selects, times and updates, with read and write access. It can find and install FEMS updates, and it supports single and multi-edge systems. Pre-configured dashboard cards cover storage, EV charging, grid optimized charging, emergency capacity reserve, heating element and heat pump apps, plus a battery diagnosis dashboard with derived voltage difference values. An action changes OpenEMS component properties, and REST write actions send values for sensor channels back to the backend, though those values are not shown in Home Assistant.

Automatic summary of the README and code of Lamarqe/ha_openems. Something wrong, or are you the maintainer and want your own text here? Get in touch

Supports

Works locally Talks to your devices on your own network. No vendor cloud in between.
From the Marketplace Installed through the Marketplace, formerly HACS.
Actively maintained Its author released or pushed a change in the last six months.

Provides

Switches
Sensors

Setting it up

Install it from the Marketplace and restart Home Assistant, then add it under Settings, Devices and services.

Connect

HostThe hostname or IP address of your Fenecon or OpenEMS system
PasswordFor local monitoring, common values are "user" or "owner"
UsernameThe username to access the system. Use "x" for local monitoring access
Connection type
Custom URLCustom Websocket URL, eg: ws://192.168.1.100:8888/websocket

Edges

OpenEMS Edge to be integrated

After setup

Limit data updates (seconds)Interval in seconds to publish channel data. Set to 0 to disable rate limits.
Ignore decreasing if total increasing

Texts from the code of Lamarqe/ha_openems.

Actions

Update component configurationChanges properties of OpenEMS components. All properties of a component are sent in a single updateComponentConfig request. Number limits are not checked.Fields: Component devices, Properties
REST write sensorCyclically sends a value for the channel of a sensor entity to the backend via REST. Values sent via REST write are not reflected by the backend and thus not visible in Home Assistant.Fields: Value, Timeout, Update cycle
REST write binary sensorCyclically sends a value for the channel of a binary sensor entity to the backend via REST. Values sent via REST write are not reflected by the backend and thus not visible in Home Assistant.Fields: Value, Timeout, Update cycle