Solar power clamp spikes

Energy
1

Dear community

I use a HA running in a VM on a Synology
I have two sets of solar panels ; the 2nd is integrated properly via the inverter however the first one has a broken API and cant integrate it easily via its inverter. So I have attached a power metering clamp on the cable directly
I have adjusted the sensor output via trial and error (I have good data on what is being generated and consumed on my grid) in configuration yaml as seen:

compensation:
    solar_clamp_compensated:
      unique_id: ID_Clamp_compensated
      source: sensor.solar_clamp_power
      unit_of_measurement: W
      lower_limit: true
      data_points:
      - [0.0, 0.0]
      - [0.1, 0.1]      
      - [1.0, 1.0]
      - [500, 875]

Though the values generated ending up in my power dashboard are quite accurate, there is an exception :
in the mornings , the first hour of the day, it generates a spike that makes no sense

solar_clamp
solar_clamp838×474 11.5 KB

in the picture above I would expect the first hour with sun to be less than 1KWh

a) why is this spike created?
b) how can I avoid it?

Regards
Ilias

2

Share the history graph of the power sensor.

How are you converting the power to energy for the energy dashboard?

Share the history graph of the energy sensor.

3

This is how i am converting the sensor input to a format that can appear in the energy dahsboard.

this is included in customise.yaml:

sensor.clamp_kwh_sensor:
  state_class: total_increasing
  status: collecting
  last_period: 0
  last_valid_state: 1190.0
  unit_of_measurement: Wh
  #device_class: energy
  device_class: energy
  friendly_name: Custom_Compensated_clamp_power

this is in my sensor.yaml

- platform: template
  sensors:
    clamp_kwh_sensor:
      friendly_name: clamp_kwh_sensor
      device_class: energy 
      unit_of_measurement: W
      value_template: "{{states('sensor.solar_clamp_compensated')|float(0)}}"

the raw input from the sensor is like this

raw_clamp
raw_clamp1166×428 43.9 KB

and here the compensated one

compensated
compensated1162×456 32.2 KB

4

You can’t just add attributes to a power sensor to make it an energy sensor. It needs to be integrated with respect to time. Feed your power sensor to this to get an energy sensor:

Use method: left

5

I had the integrator already in place, sorry i did not mention it.

So on the occasion of HACS not working after HAOS update to 2025.1, I had a look in the logs. I fixed HACS and I noticed my conversion to energy had a warning , I was using unit “W” while i had to use “Wh”. I changed this, I had multiple restarts due to 2025.1 updates and since then… it has been working excellently :

image
image1157×560 30.3 KB