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Evapo Transpiration (ET) From Weather Data

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    Jeff Benjamin

    Update: Found this under the program page using the Webui - set the time to Month. I had always wondered what the 'grey' dots represented. Now I know it is the ET for the day. This shot shows all three times this summer the system had not watered. One was over a week long, previous the system had watered over 100% and when it did get readings again, you see the ET is off the chart, above 100. I had to manually water four times during that one week. The other two times you will see a 'blue' little bump, this is where the system did a little trickle of water.

    This is a major bug - If data is not collected from the weather station for that day - the ET should not go to '0'.

    At least now I know what happened, but it took this third time of not watering for me to look into it.

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    RainMachine Nicholas (Edited )

    Hi Jeff,

    We don't add 0 if there is no data, only if we receive 0 from the weather service. I guess you are using Weather Underground, can you tell me the weather station ID/Name so I can look back in the past for it's data ? Do you use the beta version of RainMachine or the stable version ?

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    Jeff Benjamin (Edited )

    Hello Nicholas,

    You are correct, I am using Weather Underground for actual data - the station is (Paul's Place) KMNSTILL23 (should say was). It has been off line every day from ~03:00 to ~08:00 CDT for the last five days. If again tomorrow, I may simulate to see the data the system pulls down. I am running the 'Stable' version of 4.0.925.

    You stated that the system does not add '0' - but from the manual the ET is calculated from many sources. I am sure that one of those is 'solar Radiation' - on 2018-08-05 the Solar Radiation from Weather Underground appears to be a -267.2799999. From a negative number for solar radiation, I'm sure the ET calculated from the system would then be '0' it would not know how to handle a negative number? After I changed stations on 2018-08-06 at 18:54 and did a 'Refresh' the solar radiation was now at 15.16. ET remained at 0 until calculations took place on 2018-08-07 shortly after midnight.

    This is what I see from the logs. The earliest log still available was at 03:03 on 2018-08-06, so I can not tell when it started to record the negative number for this value. 

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    RainMachine Nicholas

    Thanks for detailed information. Please disable the use of solar radiation for now. We will enforce more limits across weather parser in the future.

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