Welcome to the Cumulus Support forum.

Latest Cumulus MX V3 release 3.28.6 (build 3283) - 21 March 2024

Cumulus MX V4 beta test release 4.0.0 (build 4017) - 17 March 2024

Legacy Cumulus 1 release v1.9.4 (build 1099) - 28 November 2014 (a patch is available for 1.9.4 build 1099 that extends the date range of drop-down menus to 2030)

Download the Software (Cumulus MX / Cumulus 1 and other related items) from the Wiki

WS80 solar

GW1000 WiFi gateway
Post Reply
User avatar
HansR
Posts: 5870
Joined: Sat 20 Oct 2012 6:53 am
Weather Station: GW1100 (WS80/WH40)
Operating System: Raspberry OS/Bullseye
Location: Wagenborgen (NL)
Contact:

WS80 solar

Post by HansR »

I have a WS80 and on bright solar days I get the following effect on the charting of the solar radiation:
    Schermafbeelding 2022-04-20 112029.jpg
      This is no coincidence, the measured curve is biased in the morning hours. From 10h to 13h30 (DST) it is biased upward around up to 30%. It seems directional: it starts at East and once the sun has passed South the values become reasonable again.

      Anybody?

      Does there exist a filter to avoid this effect?
      You do not have the required permissions to view the files attached to this post.
      Hans

      https://meteo-wagenborgen.nl
      CMX build 4017+ ● RPi 3B+ ● Raspbian Linux 6.1.21-v7+ armv7l ● dotnet 8.0.3
      broadstairs
      Posts: 744
      Joined: Thu 14 Aug 2008 7:17 am
      Weather Station: Ecowitt GW1003/GW1103/GW2000
      Operating System: Windows 7 and Linux
      Location: Broadstairs, Kent, UK
      Contact:

      Re: WS80 solar

      Post by broadstairs »

      Does you WS80 have a small white filter over the central area of the top where the solar sensor sits? Mine does and it has improved it but I still need to calibrate the output by 0.75 to get the levels down to reasonable. I still find CMX gives more sunshine hours than Weather Display though. Could there be something to the East which causes reflections?

      Stuart
      User avatar
      HansR
      Posts: 5870
      Joined: Sat 20 Oct 2012 6:53 am
      Weather Station: GW1100 (WS80/WH40)
      Operating System: Raspberry OS/Bullseye
      Location: Wagenborgen (NL)
      Contact:

      Re: WS80 solar

      Post by HansR »

      No, you look straight into the sensor, no filter to be seen. Your calibration is roughly the same as mine. Sunshine hours are OK here (have been checking for some time, seems close).

      And I have been thinking about possible causes for this effect but can't think of any. No reasonable reflection.
      Maybe polarisation through the cover glass?
      Hans

      https://meteo-wagenborgen.nl
      CMX build 4017+ ● RPi 3B+ ● Raspbian Linux 6.1.21-v7+ armv7l ● dotnet 8.0.3
      broadstairs
      Posts: 744
      Joined: Thu 14 Aug 2008 7:17 am
      Weather Station: Ecowitt GW1003/GW1103/GW2000
      Operating System: Windows 7 and Linux
      Location: Broadstairs, Kent, UK
      Contact:

      Re: WS80 solar

      Post by broadstairs »

      Yes my old WS80 (replaced under warranty) did not have the white filter but the new one does. I'm still trying to work out why my Weather Display has fewer sunshine hours than CMX using the same data as input from the sensor. The expected max values are different between the two which may well account for that but I'm still investigating.

      One other thought I suppose your WS80 is vertical and not leaning over at all? Should not make that much difference but thought I'd mention it. Also I assume it is clean?

      Stuart
      User avatar
      HansR
      Posts: 5870
      Joined: Sat 20 Oct 2012 6:53 am
      Weather Station: GW1100 (WS80/WH40)
      Operating System: Raspberry OS/Bullseye
      Location: Wagenborgen (NL)
      Contact:

      Re: WS80 solar

      Post by HansR »

      Yes, it's clean. Have to check the leveling I guess. Good point.

      Wrt sunhours you probably have to compare the methods. I assume in both applications it is an algorithm (in CMX it is) and it is configurable.
      Hans

      https://meteo-wagenborgen.nl
      CMX build 4017+ ● RPi 3B+ ● Raspbian Linux 6.1.21-v7+ armv7l ● dotnet 8.0.3
      broadstairs
      Posts: 744
      Joined: Thu 14 Aug 2008 7:17 am
      Weather Station: Ecowitt GW1003/GW1103/GW2000
      Operating System: Windows 7 and Linux
      Location: Broadstairs, Kent, UK
      Contact:

      Re: WS80 solar

      Post by broadstairs »

      Yes I know, I helped write the expected max code in WD some years ago. I'm talking to Mark about the CMX interpretation.

      Stuart
      Post Reply