wewwx new variables

[maria gourniezaki]

Hi all,

I have a weewx station running using the fileparse driver for about 4 years now.

All variables are read periodically from a memory file. Now I want to add two additional measurements from a solar panel.

Namely I need to store (and show as respective graphs) the current power in W and as an accumulative variable I would like to store (and show) the generated KWh values.

My question is: do I need to add those two fields into the db manually or is there an automatic way. Those two measurements are already present in my fileparse file together with the respective values.

What else should I add to the weewx config files so to define the nature of the variables (accumulative, etc).

Please help me to complete this task

BR

Maria

[michael.k...@gmx.at]

You probably want to use wee_database --add-column 

https://weewx.com/docs/latest/customizing.htm#Modifying_an_existing_database

[maria gourniezaki]

Thank for your response. How to distinguish between accumulative fields and now accumulative ones?

Is this done into the weewx config file? And how about specifying the units (KW, Joule, etc)?

M.-

[Rainer Lang]

the fields are oblivious of how the data stored was achieved (min, max, avg, sum ...).
This is defined in the accumulators for the weewx field map - and if your new variable is not contained or you want a different way from the default accumulator behaviour, you have to add this to the [Accumulator] stanza in weewx.conf

I suggest your study the weewx customization guide in the weewx documentation - I think most if not all of your questions are answered already there.
Your scenario is in principle described there - independent of the driver. Also how and where to define new units - or assign existing ones.

https://www.weewx.com/docs

If you get stuck, come back here 😁

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[Graham Eddy]

values like rain - and, in my own case, energy created by solar panel inverter - need to be summed not averaged over the archive interval.

the default accumulator for a data_type is averaging, so you need to specify your new data_type explicitly as summed - in my case, ‘’weewx.conf'' has:

[Accumulator]

    [[gen_energy]]

        extractor = sum

not sure where this is documented. other types are average, last, first, ...

⊣GE⊢

[Tom Keffer]

Accumulators

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[maria gourniezaki]

Thanks, very good wiki indee

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