Flux Query/ Function to find the cumulative sum of the data

[joka]

If I understood your problem right I solved it here:

How to calculate kwh in a specific time period each day?

Thx @Giu-seppe especially you are the only one how answered! But your answer didn’t full fill my needs or I didn’t understand it. Here is the solution I worked out myself, maybe it will help someone: import "timezone" option location = timezone.location(name: "Europe/Berlin") data1 = from(bucket: "homey-downsample") |> range(start: v.timeRangeStart, stop: v.timeRangeStop) |> filter(fn: (r) => r["_measurement"] == "Wattcher") |> filter(fn: (r) => r["_field"] == "meter_power") until_16 …