Energy integral sensor giving false values

Energy
1

I have setup a sensor that monitors my wallcharger for my EV. What I do is a multistage setup that I will explain first:
The first sensor is a binary one that will switch on as soon as the sensor.p1_meter_active_power is above 9800W and will switch of when below.

entity_id: sensor.p1_meter_active_power
hysteresis: 0
lower: null
position: above
sensor_value: 11241
type: upper
upper: 9800
device_class: battery_charging
icon: mdi:ev-station
friendly_name: Ratio Solar Active

Next I have a sensor that copies the sensor.p1_meter_active_power as long as the switch is active ( I use a factor 0.95 to compensate for other energy consumption):

  - sensor:
      - name: Ratio Solar
        unique_id: sensor.ratio_solar_power
        icon: "mdi:ev-station"
        unit_of_measurement: "W"
        device_class: power
        state_class: total
        state: >
          {% if states.binary_sensor.ratio_solar_active.state == 'on' %}
            {{ (0.95 * states("sensor.p1_meter_active_power")|float) }}
          {% else %}
            0
          {% endif %}

Finally I have created an integral sensor that uses the previous to get the energy. It uses the Trapezoidal rule, with a 2 digit precision and measures in Wh. Its history graph shows this:

image
image1036×429 11.3 KB

The graph for both the P1 and the wallcharger (Ratio Solar) show this:

image
image1058×473 24.3 KB

However the energy dashboard shows a positive value of 680.22kWh for the Ratio Solar Energy sensor and a -672.86kWh of untracked energy:

image
image829×404 12.7 KB

The value of 7.36kWh is the correct power consumption of the wall charger. What am I doing wrong here? These extreme values only occur at the start of the charge.

2

You show everything, except the important one: the integral sensor. Make sure you use left riemann, especially if you have sensors that go to 0 for long periods of time. Because Home Assistant does not store values if values do not change, what happens is that the default, trapezoid, assumes a gradual increase in value from the last time it went to 0 up to the first measurement that you get, leading to a big triangular area it suddenly counts as usage.
IMG_0923

On a sidenote, not this problem but maybe others: use availability templates to indicate when sensors are not available. this too can prevent headaches.

3

Thank you for the reply.
I’ve updated the integral sensor to left riemann. Next charging session I’ll check if it’ll solve my issue.

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