Hi, Your station has a sensor that reports illuminance in lux and the fineoffset driver approximates solar insolation using a simple linear multiplier. From the comments in fousb.py:
Illuminance and Radiation The 30xx stations include a sensor that reports illuminance (lux). The conversion from lux to radiation is a function of the angle of the sun and altitude, but this driver uses a single multiplier as an approximation. Apparently the display on fine offset stations is incorrect. The display reports radiation with a lux-to-W/m^2 multiplier of 0.001464. Apparently Cumulus and WeatherDisplay use a multiplier of 0.0079. The multiplier for sea level with sun directly overhead is 0.01075. This driver uses the sea level multiplier of 0.01075. Use an entry in StdCalibrate to adjust this for your location and altitude. Let's not start a debate about the validity/accuracy of deriving solar insolation from illuminance, I will let you google that, but you can see there is some variation in multipliers used. Bottom line is it is an approximation and if you want to vary the multiplier used you can (effectively) do so via a StdCalibrate correction <http://weewx.com/docs/usersguide.htm#[[Corrections]]>. Gary On Sunday, 13 October 2019 16:12:08 UTC+10, Johannes Ebner wrote: > > Its a WS3080 > > Br, > Johannes > > Am Samstag, 12. Oktober 2019 21:36:53 UTC+2 schrieb vince: >> >> On Saturday, October 12, 2019 at 8:37:00 AM UTC-7, Johannes Ebner wrote: >>> >>> I have yesterday installed pyephm on my Raspberry and enabled >>> maxSolarRad. >>> >>> I can see it already in my graphs, but the value is much below what is >>> coming from my weather station. What could be the reason? >>> >>> >>> >> What kind of weather station ? >> Many provide very incorrect values for radiation and brightness etc. >> > -- 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 [email protected]. To view this discussion on the web visit https://groups.google.com/d/msgid/weewx-user/d6a11670-1cd7-4322-b6d3-94bd11c276a8%40googlegroups.com.
