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OpenEMS
What it is
OpenEMS is a free, modular open-source platform for monitoring, controlling and integrating energy storage, renewable sources and related devices and services. Its IoT stack includes OpenEMS Edge for on-site communication and control, OpenEMS UI for browsers and smartphones, and OpenEMS Backend for connecting Edge systems and providing internet-based aggregation, monitoring and control. The architecture supports fast PLC-like control, reusable device-independent algorithms and modular extension. Integrations cover batteries, solar and battery inverters, EV charging stations, meters, tariffs and data services. Interfaces include MQTT, Modbus/TCP, Modbus/RTU, InfluxDB, M-Bus, 1-Wire, JSON/REST and JSON/Websocket. Edge and Backend use the Eclipse Public License 2.0, while UI uses the GNU Affero General Public License 3. Production deployment guidance covers Debian, Ubuntu or Docker, and Java 21 is required. Source is available online and on GitHub, with monthly releases described. The getting-started setup is for testing and is not recommended for production use.
For and against
For
- Free, modular open-source energy platform
- Edge, UI and Backend components
- Supports many energy-device integrations
- Multiple industrial and web data interfaces
- Source available online and on GitHub
Against
- Requires Java 21
- Testing setup is not recommended for production
- Different components use different licenses
- Production deployment requires Debian, Ubuntu or Docker guidance
The verdict
OpenEMS offers a broad stack for energy monitoring, device control and integration, with documented interfaces and extensible components. Review licensing, Java requirements and the testing-only setup guidance before production deployment.
Who it suits
It suits universities, research institutes, grid operators, hardware makers, software companies and private or commercial energy owners. Teams needing energy monitoring, forecasting, device integration or API access may consider it.
On the record
- Components
- Its IoT stack has OpenEMS Edge for on-site device communication and control, OpenEMS UI for browsers and smartphones, and OpenEMS Backend for connecting Edge systems and providing aggregation, monitoring, and control over the internet.openems.github.io · read 7 Oct 2026
- Control
- The architecture supports fast, PLC-like device control and reusable, device-independent control algorithms.openems.github.io · read 7 Oct 2026
- Control and extensibility
- The architecture supports fast, PLC-like device control, modular extension, and reusable device-independent control algorithms.openems.github.io · read 7 Oct 2026
- Deployment
- The getting-started guide describes production deployment of Edge and Backend on Debian/Ubuntu or Docker.openems.github.io · read 7 Oct 2026
- Extensibility
- The software uses a modular architecture and modern programming languages to support extension.openems.github.io · read 7 Oct 2026
- Integration levels
- OpenEMS Ready Basic indicates a device or service is integrated; Silver also requires the manufacturer or service provider to be an Association member; Gold additionally requires integration developed and supported by that manufacturer or provider.openems.io · read 7 Oct 2026
- Integrations
- The OpenEMS Ready list includes integrations across energy storage, batteries, solar and battery inverters, EV charging stations, meters, tariffs, and data services.openems.io · read 7 Oct 2026
- Intended users
- The marketplace describes an ecosystem for hardware manufacturers, software developers, research institutes, universities, freelancers, and students.openems.io · read 7 Oct 2026
- License
- The documentation states that OpenEMS Edge and Backend use the Eclipse Public License 2.0, while OpenEMS UI uses the GNU Affero General Public License 3.openems.github.io · read 7 Oct 2026
- Marketplace
- The OpenEMS Marketplace connects commercial users and people seeking or offering expertise, including developers, freelancers, students, research institutes, and universities.openems.io · read 7 Oct 2026
- Project origin
- The documentation says OpenEMS development was started by FENECON GmbH and that the software stack is used in private, commercial, and industrial applications.openems.github.io · read 7 Oct 2026
- Protocols
- Listed data interfaces include 1-Wire, InfluxDB, M-Bus, MQTT, Modbus/TCP, Modbus/RTU, JSON/REST, and JSON/Websocket.openems.io · read 7 Oct 2026
- Purpose
- OpenEMS is a modular open-source platform for monitoring, controlling, and integrating energy storage, renewable energy sources, and complementary devices and services.openems.github.io · read 7 Oct 2026
- Runtime requirement
- OpenEMS requires Java 21 to run, according to the getting-started guide.openems.github.io · read 7 Oct 2026
- Security
- The documented Backend-to-Backend API supports BasicAuth when a connection is opened.openems.github.io · read 7 Oct 2026
- Source and releases
- The source code is available online and on GitHub, and the documentation says new versions are released monthly.openems.github.io · read 7 Oct 2026
- Support
- The project invites users to get in touch through the OpenEMS Community forum and says it is glad to support third parties taking their first steps.openems.github.io · read 7 Oct 2026
- Testing limitation
- The getting-started setup is intended for testing and is not recommended for production use.openems.github.io · read 7 Oct 2026
