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IotaWatt USA Bundle

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£190.01 (inc VAT) £158.34 (exc VAT)
1,250.00 Grams
Calculated at checkout

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IotaWattTM is an open-hardware 14 channel WiFi connected AC electric power monitor.

This bundle is tailored for the USA users (see 'includes' section below)

Save 10% over purchasing items individually

It's based on the ESP8266 IoT platform using MCP3208 12 bit ADCs to sample AC voltage and current at high sample rates. Data is saved locally to the on-board SD card and (optionally) posted online to Emoncms.org or another Emoncms server e.g. emonPi. On-board data storage ensures no data-loss in the event of network failure. If network is lost data saved locally will be bulk-uploaded to Emoncms when connectivity is restored.

The IotaWatt is configured via a web-interface, see online demo: iotawatt.com


USA bundle Includes 

  • IotaWatt tm - fully assembled & tested
  • 8 GB on-board SD card 
  • AC-AC voltage sensor adaptor
  • 5V DC Micro-USB power adaptor & Micro-USB cable
  • 2 x SCT019 200A max - for split-phase main breakers
  • 2 x SCT013 100A max - e.g Solar inverter, subpanel-feeds, large appliances e.g. Water Heater, Oven, Dryer, WellPump
  • Wall-mount bracket 


  • 14 x single-phase AC current sense (CT) channels
  • 1 x AC VRMS Channel
  • Compatible with multiple types of CT sensors and AC-AC voltage sensor adaptor
  • Local SD card logging 
  • WiFi connected to post to Emoncms / InfluxDB
  • Sample rate: 35-40 channels per second
  • Voltage (VRMS), Power (W) and Energy (kWh) logged to local SD card every 5s
  • On-board Real-time-clock (RTC) with battery backup
  • Web-config interface config
  • Secure automatic OTA firmware updates  
  • 5V Micro USB power supply
  • Wall mountable 

  • Open-source / hardware
  • CE certified
  • RoHs compliant 


The IotaWatt has been designed by Bob Lemaire (@overeasy) in collaboration with OpenEnergyMonitor. 







Getting Started



To obtain IotaWatt support or report a bug please either: 

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