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Open EnergyMonitor Home Docs Community BlogShop Search Open EnergyMonitor Open source monitoring for understanding energy Exploring zero carbon energy systems Energy Use Monitor electricity, temperature and humidity View historic and real-time data Local and/or remote data logging Solar PV Explore solar PV generation Compare consumption Calculate on-site use Optimise demand matching EV Charging WiFi connected Web app interface Real-time solar PV diversion Variable charge rate Emoncms data logging Advanced safety features Open APIHeat Pump Monitoring Electricity and heat monitoring Track heat pump performance Remote diagnostics Introducing the OpenEnergyMonitor system Pre-assembled open-hardware electricity, temperature and humidity monitoring units based on the Arduino and Raspberry Pi platforms emonPi 2 6x CT Sensor inputs 1x VRMS input Pulse input Temperature sensing Higher accuracy emonTx 5 2x CT Sensor inputs 1x VRMS input 1x Pulse input 6 x Temperature Emoncms logging Home AssistantemonTH Internal temperature Internal humidity External temperature Pulse input Long battery life EmonCMS Web application Data storage Data processing Data visualisation Cloud or self-hosted All products are available to buy from the Shop Get more information on how to set up an OpenEnergyMonitor system from the Docs Learn An in-depth look at the basic principles of electricity monitoring, sustainable energy and more. Electricity Monitoring Learn all about the basics of electricity monitoring, from AC power theory to designing and building your own monitoring system. Sustainable Energy Exploring the context of energy, renewable supply, energy efficiency and zero carbon energy systems. PV Diversion Learn how to build a solar PV diverter to make use of excess energy....