Emoncms

Emoncms is an open-source web application for processing, logging, and visualizing energy, temperature, and other environmental sensor data. It is part of the OpenEnergyMonitor ecosystem and is commonly used to build local energy monitoring and reporting systems.

Key Features

• Input processing pipeline to transform, scale, filter, and route incoming measurements into stored feeds
• Time-series feed storage optimized for sensor data logging, including built-in PHP-based engines (e.g., PHPFina and PHPTimeSeries)
• Dashboards and advanced graphing via modular components (dashboard and graph modules)
• HTTP API for posting data and querying feeds for integration with external devices and systems
• Optional Redis buffering and processing to reduce disk writes and support certain input processors
• CSV export and tools for backups/imports depending on installed modules

Use Cases

• Home and building energy monitoring (electricity, solar PV, heat, hot water)
• Logging and visualization of temperature, humidity, and other environmental metrics
• Creating shareable dashboards for energy and sustainability reporting

Limitations and Considerations

• Some features and workflows depend on optional modules and background workers; deployments without Redis may have reduced functionality for certain processors
• Official installation guidance and testing focus on Linux environments (notably Debian/Ubuntu and Raspberry Pi OS)

Emoncms is a practical choice when you need a customizable, self-managed platform to ingest sensor readings, store them as time series, and present them through dashboards and graphs. Its API- and module-driven design makes it suitable for both DIY monitoring setups and more integrated energy data systems.