How to measure ampere-hours with current- and voltage-meter PZEM-017 (virtual entity)

ESPHome
1

I have a PZEM-017, a digital DC voltage, current, power, and power consumption meter connected to ESP32. The following configuration provides Home Assistant with four entities.

sensor:
  - platform: pzemdc
    current:
      name: "PZEM-017 Current"
    voltage:
      name: "PZEM-017 Voltage"
    power:
      name: "PZEM-017 Power"
    energy:
      name: "PZEM-017 Energy"
    update_interval: 60s

What I need is to have a fifth entity in HA which would measure ampere-hours and would build historical graphs. I require it to measure the capacity of the battery through its discharging. Dividing Energy by the Voltage to get amp-hours is not the solution, because the Voltage won’t be constant.

Who knows how to «create» such virtual sensor basing on the existing ones?

2

Using an integration helper in Home Assistant seems like it would probably work for your needs.

3

Thank you very much! It works! :+1: