Power quality data in Grafana
Power quality data in Grafana

Split Single Phase Real Time Whole House Energy Meter Kit – Programmed ESP32, 2 CTs, ABS Box

(3 customer reviews)


SKU: EM-Kit Category: Tag:


The CircuitSetup Split Single Phase Energy Meter can monitor the energy usage in your entire home in real time. It can easily be hooked up to an ESP32 to wirelessly transmit energy usage data into a program like EmonCMS.

12/30/19 – v1.4 of the energy meters are now in stock!

With the Split Single Phase Energy Meter you can:

  • Save Money!
    • See exactly how much money is being spent on energy in real time
    • Find appliances that are using too much electricity
    • Calculate energy usage for a single room to divide an energy bill fairly among roommates
  • View & Gather Energy Data
    • View the energy usage of your entire home
    • Calculate how much it costs to charge your electric vehicle
    • Remote energy monitoring for vacation or rental properties
    • Review and graph historical energy data
  • Be Informed!
    • Independent of your power utility’s meter
    • Set up alerts for over or under usage
    • Prevent surprises on energy bills
    • View usage data in the EmonCMS Android or iOS apps
    • Automate notifications with your home automation system like “send my phone a message when the dryer is done”, or even “if I leave the house, and the oven is on, send me an alert” (programming required)
  • Spend less on energy monitoring hardware!
    • Affordable but very accurate
    • Save hundreds over popular monitoring systems


  • Uses the Microchip ATM90E32AS
  • Samples 2 current channels & 1 voltage channel (expandable to 2 voltage)
  • Calculates:
    • Active Power
    • Reactive Power
    • Apparent Power
    • Power Factor
    • Frequency
    • Temperature
  • Uses standard current transformer clamps to sample current
  • Includes built-in buck converter to power ESP32
  • 2 IRQ interrupts, and 1 Warning output
  • Energy pulse output (pulses correspond to 4 LEDs)
  • Zero crossing output
  • SPI Interface
  • Measurement Error: 0.1%
  • Dynamic Range: 6000:1
  • Gain Selection: Up to 4x
  • Voltage Reference Drift Typical (ppm/°C): 6
  • ADC Resolution (bits): 16
  • Compact size at only 40x50mm
  • Open source! 

The Energy Meter Kit Includes:


Please see our Github repository for details on setting up software for the energy meter.

Additional information

Weight 10 oz
Dimensions 5 × 5 × 5 in
Include 120v to 9V AC Transformer

No, Yes

3 reviews for Split Single Phase Real Time Whole House Energy Meter Kit – Programmed ESP32, 2 CTs, ABS Box

  1. Guillermo

    Works with 220v?

    • circuitsetup

      Yes it does. You just need to calibrate your AC transformer to correctly measure voltage. We do not stock 220v AC transformers.

  2. Key

    If I purchase this kit, what else do I need to do?
    Do I need to do any programming?
    Can it measure energy production from Solar? (Can this read negative reading from meter?)

  3. Christ

    from where can i buy the complete kit. From this website or crowd supply? If I connected to only 1 phase can I disable the second AC transformer?

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