Hey people! I've read the docu and also made some calculations, but nevertheless I come to no right solution. The Tasmota sends my out of the box a "kWh" which was exactly what I needed. I made query in influxdb and got my daily power consumption. Example: If I save every 10 seconds the aenergy v…

[image] Colin: I prefer to use the energy figure (watts) Should that be 'power'? If so, the problem is that the power data produced by the Shelly is an instantaneous snapshot made at that moment. If it updates, say every 10 seconds, what power is being used in the remaining 9.999999 seconds,…

[image] Paul-Reed: Should that be 'power'? Yes, thanks. Corrected.

[image] Paul-Reed: the problem is that the power data produced by the Shelly is an instantaneous snapshot made at that moment. If it updates, say every 10 seconds, what power is being used in the remaining 9.999999 seconds, it could vary enormously and therefore not present a true and accurate r…

[image] Paul-Reed: Last measured instantaneous active power It is impossible to measure that, it has to be averaged over at least one complete mains cycle. In practice it is probably measured over a significant period. Possibly several seconds. It would be interesting to monitor the figure…

[image] Colin: In practice it is probably measured over a significant period I don't think Shelly would stress 'instantaneous' if it was an averaged value. Have you read somewhere that it is an averaged value? [image] Colin: then switch on a simple resistive load and see what it shows. …

[image] Paul-Reed: I don't think Shelly would stress 'instantaneous' It is not mathematically possible to measure it instantaneously, it has to be measured over at least one mains cycle. In practice, in order to get an accurate figure, it will be calculated over a period. [image] Paul-Re…

[image] Colin: It is not mathematically possible to measure it instantaneously Let's agree to disagree about that😉 I'm going to leave this here.

Isn't that just some extra math to account for the value suddenly going less-than the previous value? Of course, you would probably have to make an assumption about when the reset happened but assuming that your reporting period is no more than about a minute, unless you are REALLY stressing about e…

[image] TotallyInformation: Isn't that just some extra math Do you mean on the way into the influx database? I can't see how to do it in a query. Doing it after the query would mean fetching all the intermediate values in order to step through and find where it reset, which would be painful…

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Understanding Shelly aenergy vs apower for daily power consumption?

Hardware

Colin 17 December 2022 11:57 15

I agree that storing the accumulated total would make the queries on the database simpler. But how to you cope with it resetting to zero occasionally?

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Understanding Shelly aenergy vs apower for daily power consumption?

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