Hello!
I’m just started wit HA and the first thing I was interested was the already implemented Energy dash bord. Unfortunately, the summaries and calculations here are not fit to a “standard” electrical installation here in Germany.
Let me explain the possible configurations:
Only usage of power: the standard “modern measurement system” for currant has one meter for used energy.
Having a PV system, configured for selling power only: you will have separate meters for delivered power and for consumed power
Having a PV system, configured for self-usage the solar power, there is only ONE meter with 2 tariff counters to summarize what you consume from the grid and what you deliver to the grid. The ACTUAL VALUE of power will show the summary of the delivered and consumed power. So, it goes from plus to minus values. If it will show MINUS, the summary counter for DELIVERED power will count, if it shows PLUS, the summary counter for USED power will count. That’s the values you need to tell the power company and grid operator.
That causes a total miscalculation for the AUTACI and OWN USAGE of currant, because there is no value available what shows your actual consumption!
Next step is to add sensors / values, that deliver the real actual generated power from your PV system. I did it like this.
To calculate now your autarky and used power values, the summary of actual delivered power from all PV systems must be ADD to the actual value of usage from your grid power meter. The value you get is your real actual usage.
That’s the value what needs to be used to calculate the AUTAKY and SELF USED POWER from the PV system.
For my understanding the actual Energy Dash Board does something different and deliver false values.
So, dear developers, you may think about my thoughts and modify the calculations. Or, this page may need a configuration to give the possibility to setup a power system, that is really present.
Thank you!