How to Calculate Historical Power Consumption For a Given Period

[klew]

You are right, I seem to get the right values if I choose 18:50 instead of 19:00.

So let's say I want to get data from 26.03.2025 19:00 to 26.03.2025 20:00.
Does it mean that I need to query 26.03.2025 18:50 to 26.03.2025 20:00 i.e. always subtract 10 minutes from the start date?
Is that correct?

Thanks for your help.

It depends on a time your server store data. In general to get 60 min energy usage, you have to calculate difference between two measurement which are ~60 min apart.

Server stores data every 10 min, but this time may change when server is restarted. Also it may happen that you'll have gaps i.e. when meter was offline