Calculating System Overhead or "losses" #9
Daibutt
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I have seen several comments regarding energy values not matching up, and for a while I have been trying to estimate system "overhead" using the FoxESS cloud data.
Now we have ~real time data using the modbus integration this makes it easier to estimate these.
The inverter uses energy to do it's thing, and when you feel the inverter, batteries etc. warm to the touch, that's all using energy.
Conceptually, this is how I see it;
![image](https://user-images.githubusercontent.com/69276073/167260353-2f1c7604-7d43-496d-982a-700533661242.png)
NB: I do not have an EV, so not sure if EV chargers typically are included in the "loads" sensor or if they are separate to this.
So doing some maths;
![image](https://user-images.githubusercontent.com/69276073/167260459-ded149c5-3686-4d60-a870-62e4b55d6100.png)
![image](https://user-images.githubusercontent.com/69276073/167260486-314b2be1-0699-44a7-ae13-348f9d9ca0c2.png)
which can be rewritten as;
Im my HA configuration.yaml have added a template for a "losses" sensor, and also a totaliser and daily losses utility meter;
Template sensor;
![image](https://user-images.githubusercontent.com/69276073/167260974-97fb7ba4-b9a0-44fa-b8fe-24218628c572.png)
Totaliser;
And a daily (utility) meter;
Obviously if you have other loads or generators that are different than the diagram above you will need to alter this accordingly (i.e. 2nd inverter, EV charger that is not included in the loads sensor, Eddi?)
I am typically seeing ~ 100W system overhead/loss, and this seems to vary depending on how hard the inverter is working, which sort of makes sense.
![image](https://user-images.githubusercontent.com/69276073/167260853-da7d7a51-83ad-4b59-9915-009a0b7c8a75.png)
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