Here is my challenge.
I have installed an homematic IP thermostat in all my radiators. I live in a condo with central heating system.
The homematic IP thermostat is making available to HA the % of valve opening.
I would like to do the following:
1- Calculate the instant consumption in W based on the valve opening
2- Use the integral sensor to calculate the energy in kWh
3- Use the meter sensor or grafana to calculate the consumption per period of time
2 and 3 are not an issue.
I am struggling to find a decently accurate way to derive the instant power from the valve opening.
It does not have to be super precise, I am more interested in comparing consumption over time.
Can anyone help me? Has anyone done something similar?