Ecowitt Gateway devices provide a measure of luminosity in lux rather than a measure of solar insolation in watts/square metre (as used by WeeWX in the radiation field). There is a simple linear approximation for radiation given a luminosity value in lux by dividing the luminosity value by 126.7. This is what Ecowitt Gateway devices use when posting to Ecowitt.net or WeatherUnderground etc. Within WeeWX it is not appropriate for the Ecowitt gateway driver to implement this approximation , rather it should be applied by adding a correction entry to the [StdCalibration] [[Corrections]] stanza in weewx.conf. More detail (including implementation of the radiation field approximation) is covered in the Ecowitt gateway device wiki page Understanding GW1000 radiation fields <https://github.com/gjr80/weewx-gw1000/wiki/Understanding-GW1000-radiation-fields> .
Once you have the radiation field being calculated you should should find that ET is also calculated provided you have the other pre-requisites outlined in Tom's post are available. Gary On Tuesday, 5 July 2022 at 07:14:39 UTC+10 tke...@gmail.com wrote: > In order to calculate ET, you'll need outside temperature, radiation, and > humidity. From your query, you don't have radiation, and possibly the > others. Make sure they are all there. > > On Mon, Jul 4, 2022 at 9:49 AM John Hill <johnn...@gmail.com> wrote: > >> Sorry - this is going to sound poorly informed... but here it goes. >> >> I've been running weewx for years since the 3.x days. Using the >> interceptor driver - first with the Ambient Weather devices, now with >> Ecowitt using a GW1000 as a gateway. >> >> During that time I made numerous tweaks to the file system, changing >> skins, schemas, adding extensions, removing extensions, running through >> hubitat, then nodered, etc. Of course, I'm not very good at documentation, >> so each change I made would eventually get pushed out of my brain in favor >> of the new project du jour. >> >> I noticed a new gw1000 extension and thought maybe now would be a good >> time to wipe the slate and see what works out of the box. >> >> Surprisingly, most everything does. I do see some label and unit changes >> for radiation (used to be wmp2/radiation, now it's lux/luminosity). >> >> But the most noticeable changes is I'm now missing ET. Not sure how. I >> don't remember having to do anything in my prior install to get it to >> calculate. >> >> confirmed in sqlite that it's not in the archive: >> >> sqlite> select dateTime,ET,radiation,UV from archive order by dateTime >> desc limit 4; >> >> 1656952200|||6.0 >> >> 1656952140|||4.0 >> >> 1656952080|||2.0 >> >> 1656952020|||3.0 >> >> >> It's in my wview.py schema and in my skins.conf: >> >> [[[dayET]]] >> >> # Make sure the y-axis increment is at least 0.02 for the ET >> plot >> >> yscale = None, None, 0.02 >> >> plot_type = bar >> >> [[[[ET]]]] >> >> aggregate_type = sum >> >> aggregate_interval = hour >> >> label = Evapotranspiration (hourly total) >> >> >> have tried both prefer-hardware and software in my weewx.conf for ET >> calcualtion. >> >> Hope it's obvious, but what am I missing? >> >> -- >> You received this message because you are subscribed to the Google Groups >> "weewx-user" group. >> To unsubscribe from this group and stop receiving emails from it, send an >> email to weewx-user+...@googlegroups.com. >> To view this discussion on the web visit >> https://groups.google.com/d/msgid/weewx-user/1549e44c-8848-44ef-8c04-81444b2cd034n%40googlegroups.com >> >> <https://groups.google.com/d/msgid/weewx-user/1549e44c-8848-44ef-8c04-81444b2cd034n%40googlegroups.com?utm_medium=email&utm_source=footer> >> . >> > -- You received this message because you are subscribed to the Google Groups "weewx-user" group. To unsubscribe from this group and stop receiving emails from it, send an email to weewx-user+unsubscr...@googlegroups.com. To view this discussion on the web visit https://groups.google.com/d/msgid/weewx-user/1df9cacd-f41d-4638-8dec-14efc4a05df6n%40googlegroups.com.
