Sonoff Pow Power Monitoring Switch Module
Sonoff Pow

Available from:


GPIO #Component
GPIO00 Button1
GPIO01 None
GPIO02 None
GPIO03 None
GPIO04 None
GPIO09 None
GPIO10 None
GPIO12 Relay1
GPIO15 Led1
GPIO16 None
Configuration (old format, will be converted to new template when applied)
{"NAME":"Sonoff Pow","GPIO":[17,0,0,0,0,130,0,0,21,132,133,52,0],"FLAG":0,"BASE":6}
For more accurate energy consumption measurements this device requires power monitoring calibration.

Sonoff Pow has been obsoleted with Sonoff Pow R2. Before configuring your device check which revision you have.

⚠️️Special Attention ⚠️️

Do not connect AC power and the serial connection at the same time The GND connection of the Pow is connected to the live AC wire. Connecting serial with your PC will fry your PC and will electrocute you.

DO NOT CONNECT ANY SENSORS TO THESE DEVICES!!! The GPIOs on the Pow are connected to AC power! Only use them as designed.

The AC connection between Pow and Pow R2 is different, please check exactly which version you have.

  • Pow R2: Lo-E-E-Li-N-N = LineOut-EarthOut-EarthIn-LineIn-NeutralOut-NeutralIn
  • Pow: Lo-E-E-N-N-Li = LineOut-EarthOut-EarthIn-NeutralOut-NeutralIn-LineIn

Serial Connection

Please see the Hardware Preparation page for general instructions.

3V3, RX, TX and GND pins are available at the rear end of the PCB.

To enter flash mode, press down on the button while powering the device.

Power Monitoring Calibration

Sonoff Pow might need calibration as correct measurements are influenced by hardware and timing differences. See Power Monitoring Calibration


The Sonoff Pow can provide Energy, Power, Voltage and Current information in different ways.

The preffered way is using the periodic telemetry data. Default setting TelePeriod 300 will send telemetry data every 5 minutes.

If the setting PowerDelta (new since version 5.12.0e) is not 0 (default 80%), telemetry will be sent on power change too.

tele/pow1/SENSOR = {"Time":"2018-02-15T17:37:10","ENERGY":{"TotalStartTime":"2018-11-14T18:39:40","Total":6.294,"Yesterday":5.340,"Today":0.954,"Period":217,"Power":2635,"ApparentPower":2650,"ReactivePower":282,"Factor":0.99,"Voltage":227,"Current":11.661}}

To request information you can use command Status 8.

stat/pow1/STATUS8 = {"StatusSNS":{"Time":"2018-11-15T08:54:18","ENERGY":{"TotalStartTime":"2018-11-14T18:39:40","Total":6.404,"Yesterday":5.340,"Today":1.064,"Power":2629,"ApparentPower":2645,"ReactivePower":288,"Factor":0.99,"Voltage":226,"Current":11.677}}}

The presented information has the following meaning:

Message Unit Description
TotalStartTime Date DateTime of calculation for Total
Total kWh Total Energy usage including Today
Yesterday kWh Total Energy usage between 00:00 and 24:00 yesterday
Today kWh Total Energy usage today from 00:00 until now
Period Wh Energy usage between previous message and now
Power W Current effective power load
ApparentPower W Power load on the cable = sqrt(Power^2 +
ReactivePower W Reactive load
Factor   The ratio of the real power flowing to the load to
    the apparent power in the circuit
Voltage V Current line voltage
Current A Current line current

Self Protection for Sonoff Pow

ITEAD published a recall notice for the Sonoff Pow on March 1st 2017. Some units produced in december 2016 and january 2017 are not well suited for 16A. If you have one of these units you can decide to use them anyway by limiting the maximum current in software. It is, in fact, possible to set a Maximum Power Threshold for the Sonoff Pow.

If the power measured by the device exceeds the threshold set by the command MaxPower for a number of seconds set by the command MaxPowerHold the device will remain switched off for MaxPowerWindow seconds (to let it cool down, for example).

For all details see issue #218

Official Sources