Daily graphs showing approx twice the peak watts of hourly graphs

Hi, have Just installed my flukso v2, it's been running for about 24 hours now :

First major question, the peak wattages on the daily and hourly graphs are significantly different,

The daily graph is showing peaks approximately half the level of the hourly graphs. 4kw hourly vs 2kw daily.

Are there any possible explanations for this ?

Regards Keith.

System is Belgian and setup is as follows :

3 phase 3 wire unbalanced both single phase ( line to line ) and three phase mixed inductive and restive loads
Line to line voltage is 220v Line to earth voltage 128v

One 50A CT per phase, each recording separately at the moment, ( more of that in another post ).

Solar Inverter Segregated from consumer load measured using pulse output.

Main consumer is a 4kva single phase (line to line) heat pump,

on3ptz's picture

I think you have to set the voltage to 128 or 130V

since you have a 130/230V net

Hollie's picture

Hi Keith,

I think this is due to the fact that the plots are created by calculating the the average consumption over a certain time interval. This time interval has a different resolution for the hourly and the daily plots.

So if you're consuming e.g. 1000W for 15 minutes, this will show as '1000W' in the hourly graph (average plotted over 5 minutes), but it will show as 250W for one hour in the daily graphs (where the time interval for the average that is plotted is one hour).

Note that the exact time intervals I mention are not necessarily correct, it is just to explain the principle of the plots.

Best regards,
Lieven.

llksta's picture

Lieven, I thought that might be the case, though when I looked closely at the graphs it seems less likely as my "peaks" are quite long and stable when my heat pump runs. They seem to last longer than the resolution of the daily graph.

Hopefully Bart will respond with a deffinitive answer.

Regards, Keith

Amedee's picture

Yes indeed, it is the resolution of the RRD file

From this [1] thread:

  1.      resolution -> #datapoints
  2.      1min       -> 1440 (= 1day)
  3.      15min      ->  672 (= 7days)
  4.      day        ->  365 (= 1year)
  5.      week       ->  520 (= 5years)

[1] https://www.flukso.net/content/json

icarus75's picture

Lieven and Amedee's explanation is correct.

-Cheers,
Bart.