Jon, If you are interested at the theoretical maximum solar radiation, Weewx provides this value : *MaxSolarRad* . See https://weewx.com/docs/5.0/reference/weewx-options/stdwxcalculate/#maxsolarrad
Le jeudi 2 mai 2024 à 08:27:07 UTC+2, Jacques Terrettaz a écrit : > The "sunduration" extension is calculating the total time in a day when > there is no clouds between the sun and the Davis radiation sensor. With > clouds, the incoming radiation energy is much lower. > The formula used in this extension calculates a threshold radiation value > that depends on the date, time and geographic location (latitude and > longitude) of the sensor. For each measurement (i.e. each LOOP) if the > value reported by the radiation sensor is higher than the threshold value, > it is considered that at this time the sun is shining ( no clouds) . > So for each day the "sunshine duration" could be between a minimum value > of 0 if the weather of the day was 100% cloudy up to a maximal value > corresponding to the total daylight if the sky was 100% clear and with no > obstacle (ridge, tree ) > > Le 2 mai 2024 à 01:01, n7uv...@gmail.com <n7uv...@gmail.com> a écrit : > > 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) > > <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 a topic in the > Google Groups "weewx-user" group. > To unsubscribe from this topic, visit > https://groups.google.com/d/topic/weewx-user/JUd55LCTtDE/unsubscribe. > To unsubscribe from this group and all its topics, send an email to > weewx-user+...@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 > > <https://groups.google.com/d/msgid/weewx-user/e2d9a876-6bb7-435f-9ead-bc6c359801c2n%40googlegroups.com?utm_medium=email&utm_source=footer> > . > <Screenshot 2024-05-01 155959.png> > > > -- 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/76ba0954-ba82-4352-9c59-6b063df25a36n%40googlegroups.com.
