Intergration method to calculate energy using this power graph

[slow ledge]

which integration method should be used to calculate energy for for this power graph?
Left or Trapezoidal ? https://www.home-assistant.io/integrations/integration/#integration-method

[deft kernel]

Left is usually a good choice

Not sure if right has been fixed

Trapezoid only if it changes constantly and doesn't have many similar values

[slow ledge]

So left in this case

[inland steeple]

99,9% of the time left, yes

[slow ledge]

And trapezoid in this case

[deft kernel]

Could also do left there

[slow ledge]

Yes this is confusing me... I have both and both are same value

[deft kernel]

For now, maybe

It's about how it does the math, either through an average or an under/overestimate of the area

[deft kernel]

They all do have edge cases where their behavior differs significantly and over time those differences will accumulate

When in doubt, left is always a good choice

[slow ledge]

I asked both chatgpt and DEEPseek both insisted on trapzoidal

Used even paid model such as Gpt 4-o and GPT 4.1 they were quite insisting on trapzoidal

That is why I was in doubt

HA community always recommended left

[deft kernel]

llms don't really know, they just figure a likely response

[slow ledge]

They can actually calculate the data and reason why and which method to use but it seems they are still artifical intelligent only 🤣

Gemini same response

Gemini 2.5 pro reasoning math and code 🤣

[boreal lintel]

trapezoidal has lower error and in most applications that's more important. But the LLM doesn't know HA sensors only stores values that are different from the previous one. That's where trapezoidal method would have large errors

[inland steeple]

Integration uses state_reported now, so having repeated values would not be a problem for it.

Trapezoidal would only be a problem if the sensor did not report an update for a long time. If it continually reports updates but at the same value, that will calculate correctly.

[slow ledge]

in this case Trapezoidal will work?

[boreal lintel]

Ok great that avoids some of the error. But many devices don't report anything when they're off, like my AC. It will suddenly report 1kW and then trapezoidal will have a very large error

[slow ledge]

does constant value of 0 count as reporting?

[boreal lintel]

sure

[slow leaf]

Install emoncms...

[slow ledge]

Emoncms?

[slow leaf]

Emoncms on any device. Is made for that. Integrates into HA.