Having WeeWx calculate ET when the station doesn't generate it.

[DR]

Perhaps I assumed too much, but my Rainwise IP-100 interface to the Rainwise station does not generate ET in hardware.

I found where the hardware, software, or hardware preferred choices are in the configuration, and changed 'hardware preferred' to "software".

In my Seasons.skin running WeeWx 4.5.1 for now.  After running for more than 24 hours, still get ET  N/A on that line.

Maybe I can't get ET for this station.  It isn't too important, I'm not a professional farmer and just like watching that number when it is available.

Is there more to enabling that value beyond just changing the source preference line?  Dale

The configuration I was referencing was:

[StdWXCalculate]
    [[Calculations]]
        pressure = prefer_hardware
        altimeter = prefer_hardware
        appTemp = prefer_hardware
        barometer = prefer_hardware
        cloudbase = prefer_hardware
        dewpoint = prefer_hardware
        ET = prefer_hardware
        heatindex = prefer_hardware
        humidex = prefer_hardware
        inDewpoint = prefer_hardware
        maxSolarRad = prefer_hardware
        rainRate = prefer_hardware
        windchill = prefer_hardware
        windrun = prefer_hardware

[Tom Keffer]

To calculate ET you need:

• Outside temperature
• Humidity
• wind
• solar radiation

Do you have everything? If any one of them is missing, you'll get a N/A. 

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[DR]

Well, darn.  I don't have solar radiation on this station  yet, but can be added from prior research when I set it up.

My mistake, I should have known that.  My apologies, but I'll take education where ever I can find it.

Is there a place in the code that specifies the values and how it is calculated?

Dale

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[Tom Keffer]

See function evapotranspiration_Metric() in the file weewx/wxformulas.py.

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