I've recently installed CumulusMX for the first time and am struggling to understand Sun Hours.
I have left the default settings for Solar, and checked latitude and longitude are correctly set. In my monthly log entries I see sun hours reported for logging intervals (every 15 minutes to match my station) when there is zero solar radiation and indeed during hours of complete darkness! Can anyone explain what's going on please?
Secondly, the total sun hours reported for four consecutive logging intervals (when there is non-zero solar radiation) is often greater than 1. Can I take it that the number reported in the log under Sun Hours for each entry is a decimal fraction of 15 minutes?
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Latest Cumulus MX V4 release 4.4.2 (build 4085) - 12 March 2025
Latest Cumulus MX V3 release 3.28.6 (build 3283) - 21 March 2024
Legacy Cumulus 1 release 1.9.4 (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
If you are posting a new Topic about an error or if you need help PLEASE read this first viewtopic.php?p=164080#p164080
Sun Hours questions
Moderator: mcrossley
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rydercowan
- Posts: 16
- Joined: Fri 20 Aug 2021 7:21 pm
- Weather Station: Vantage Pro 2
- Operating System: Windows 10
- Location: Kelso, Scotland
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beteljuice
- Posts: 3292
- Joined: Tue 09 Dec 2008 1:37 pm
- Weather Station: None !
- Operating System: W10 - Threadripper 16core, etc
- Location: Dudley, West Midlands, UK
Re: Sun Hours questions
What do you expect to see ?
Sun hours is just that. The total number of sunshine hours that meteorological day upto that log point.
Sun hours is just that. The total number of sunshine hours that meteorological day upto that log point.
......................Imagine, what you will KNOW tomorrow !
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rydercowan
- Posts: 16
- Joined: Fri 20 Aug 2021 7:21 pm
- Weather Station: Vantage Pro 2
- Operating System: Windows 10
- Location: Kelso, Scotland
Re: Sun Hours questions
Very many thanks - that explains all!
To answer the question posed by beteljuice, as a new user I 'expect(ed) to see' the column headed Sun Hours show the sunshine in the logging interval, not a cumulative figure. The rainfall is reported as 'Rainfall so far', making clear it's cumulative. For consistency, perhaps the sunshine column would be better labelled 'Sun Hours so far'. The cumulative nature would probably have dawned upon me though had I waited until I had more data!
To answer the question posed by beteljuice, as a new user I 'expect(ed) to see' the column headed Sun Hours show the sunshine in the logging interval, not a cumulative figure. The rainfall is reported as 'Rainfall so far', making clear it's cumulative. For consistency, perhaps the sunshine column would be better labelled 'Sun Hours so far'. The cumulative nature would probably have dawned upon me though had I waited until I had more data!