Trend Log Aggregate

[Evens]

Hi Even,
each minute a sample of data is taking to use later in the defined resolution.
With aggregate function you are defining which sample to take. So if Maximum = during the minute you take maximum value of all datapoints.

Hi Edgars,
 
Thanks for the info, in my head it sounds like I should use maximum. But I can’t get it to work correctly. What am I doing wrong?
 
My setup:
In my switchboard I have approximately 20 fuses. I have placed a KWh counter on these fuses:
1x Main fuse.
1x Heating fuse.
1x Light fuse.
 
I have the readings from my power company, when I compare the main fuse to the list from the power company, it is totally wrong when I use Maximum. But when I use Average it seams correct.
 
But then again, I have some other problems. When calculating remaining KWh I take the KWh Main fuse – (KWh Heating fuse + KWh Light fuse) the result i am getting is an negative value. So, it seems to me that my readings are wrong.
 
What is the correct way to trend KWh? and how accurate is the measurement?
 
BR Even Sundgot.