When I hear "sunshine duration", I'm not sure whether that means the duration that the scary fiery (I live in PHX %^) ball of plasma is at and above the horizon (which is already provided under the Celestial tab) [image: Screenshot 2024-05-01 155959.png] or something about the total energy delivered to a square meter of the ground over the period of a day.
If it's the latter, then I'm interested in that. Cumulative watt-hours per sq meter means that I can a priori have a good model of how much energy I can get from a solar panel (yeah, cosines and panel efficiency). My Davis wx station reports radiation in w/m^2, there's a report every minute, so, if that's watts x 1 minute gives me watt minutes. Add up the 60 reports in the hour and divide by 60 to get me cumulative watt-hours for that hour. Ideally I'd have a graph of w-hr for each hour, and a sum that is watt-hours cumulative for the day. I have access to an 8760 model tool, and it'd be interesting to compare how well the model fits my real world. My location is is on the west side of a ridge that blocks from the sun until it's around 20 degrees above eastern horizon (winter solstice) and 34 degrees (summer solstice). I think i could get the tool to model a horizon like mine, but haven't played with it. Cheers - Jon N7UV On Wednesday, May 1, 2024 at 1:32:41 PM UTC-7 jterr...@gmail.com wrote: > Yes, different sensors will induce difference in results. > The formula used in my extension has been validated for the Davis > radiation sensor with the following specifications : > https://cdn.shopify.com/s/files/1/0515/5992/3873/files/6450_SS.pdf > As far as I know, the Weatherflow Tempest has a light sensor that measure > illuminance (in lux) and not irradiance ( in W/m2). > Even if one can find various formulas to attempt to convert illuminance > measurement ( in lux) to irradiance values(in W/m2) - see for exemple > https://www.researchgate.net/publication/347362859_A_conversion_guide_solar_irradiance_and_lux_illuminance > > - the formula of the sunduration extension will have to be modified , if > possible, to support illuminance measurements > > Le mercredi 1 mai 2024 à 12:21:35 UTC+2, Ton vanN a écrit : > >> Looking for a 'proven' calculation for sunshineduration as element of >> WeeWX, see https://github.com/Jterrettaz/sunduration >> Shown solution linked to Davis Vantage_Pro. >> Different sensors may induce difference in results: >> any experiences if linked to Weatherflow_Tempest? >> >> Op zaterdag 26 maart 2022 om 19:41:50 UTC+1 schreef Karen K: >> >>> Now I see it: There is "sum" missing at the end: >>> >>> $day.sunshine_time.sum >>> >>> >>> Meteo Oberwallis schrieb am Samstag, 26. März 2022 um 19:35:00 UTC+1: >>> >>>> Hey. >>>> >>>> Yes. Is in the weewx.sdb. The current sunshine time works. The day >>>> sunshine time not. >>>> >>>> Holen Sie sich Outlook für Android <https://aka.ms/ghei36> >>>> >>> -- 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/e2d9a876-6bb7-435f-9ead-bc6c359801c2n%40googlegroups.com.
