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Sunshine hours

Discussion specific to Fine Offset and similar rebadged weather stations
imballinger
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Weather Station: AE WS3803
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Sunshine hours

Postby imballinger » Mon Aug 29, 2016 7:35 am

What exactly are the sunshine hours supposed to represent? As it's 8.35 am clear blue skys and I am getting zero hours?

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steve
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Re: Sunshine hours

Postby steve » Mon Aug 29, 2016 10:23 am

Cumulus has no idea whether the sun is actually shining, it uses the 'light' reading from the station to make a best guess, based on where you are, the date, and the time of day. You may need to 'tweak' the solar settings - see the help for the station settings screen. There are also a number of threads about this on the forum, here's one which may help, for example: http://sandaysoft.com/forum/viewtopic.php?f=13&t=14747

Note that you need to have provided Cumulus with your correct co-ordinates for this to work at all.
Steve
-----
Hosting available for Cumulus web sites. See http://sandaysoft.com/forum/viewtopic.php?f=2&t=11876

Please read the posts in the Announcements section about the current status of Cumulus development since I have retired from my day job

imballinger
Posts: 17
Joined: Mon Aug 29, 2016 6:40 am
Weather Station: AE WS3803
Operating System: Windows 10

Re: Sunshine hours

Postby imballinger » Mon Aug 29, 2016 10:28 am

So I need to tweak the settings so when the sun goes behind a cloud it stops recording as sunshine hours? Or is this trying to record from when the sun rises to when the sun sets?

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steve
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Re: Sunshine hours

Postby steve » Mon Aug 29, 2016 10:35 am

Once a minute, it attempts to determine whether the sun is shining. If it is, it adds a minute to the total for today. You can use the yellow sun indicator on the main screen to determine whether Cumulus currently thinks the sun is shining, and compare it with reality. Note that there will be a lag, as the station only updates its light reading once a minute (I think).
Steve
-----
Hosting available for Cumulus web sites. See http://sandaysoft.com/forum/viewtopic.php?f=2&t=11876

Please read the posts in the Announcements section about the current status of Cumulus development since I have retired from my day job

imballinger
Posts: 17
Joined: Mon Aug 29, 2016 6:40 am
Weather Station: AE WS3803
Operating System: Windows 10

Re: Sunshine hours

Postby imballinger » Mon Aug 29, 2016 10:45 am

So it's a fine balance, I presume were not trying to record actual sunshine on the station,

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PaulMy
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Re: Sunshine hours

Postby PaulMy » Mon Aug 29, 2016 12:25 pm

I presume were not trying to record actual sunshine on the station,

Unless you use a Blake-Larsem Sunrecorder station ;) http://www.komokaweather.com/weather/su ... ay_v1.html

Enjoy,
Paul

AllyCat
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Weather Station: Fine Offset 1080/1 & 3080
Operating System: Windows XP SP3
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Re: Sunshine hours

Postby AllyCat » Tue Aug 30, 2016 8:28 am

Hi,

imballinger wrote:.... I presume we're not trying to record actual sunshine on the station,


Well Yes, provided that the sun is able to shine directly onto the sensor (it's the small white dome inside the Solar Pod). But this may create major issues with the accuracy of the External Temperature, etc.. (due to the poor "Sun Screen" over the T/H sensor/transmitter). Moving the Pod (or the T/H transmitter) to a more favourable position, by extending the cable is possible, but not easy.

Cheers, Alan.

Snicker
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Weather Station: WMR100N
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Location: Norway
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Re: Sunshine hours

Postby Snicker » Tue Mar 06, 2018 1:08 pm

Is there any way I can use the UV Index to calculate sun hours? If UV index is above 0 then count that the Sun is shining?
Where there's pleasure... there's always some pain!
-Snicker-

AllyCat
Posts: 1041
Joined: Sat Feb 26, 2011 1:58 pm
Weather Station: Fine Offset 1080/1 & 3080
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Location: SE London

Re: Sunshine hours

Postby AllyCat » Tue Mar 06, 2018 6:18 pm

Snicker wrote: If UV index is above 0 then count that the Sun is shining?


That's very unlikely to give a useful value. In summer, the UV Index can be well above zero, even under cloudy skies (and resolved only as an integer).

Estimation of "The Sun is Shining" can be quite difficult (particularly between Summer and Winter and near sunrise/sunset) even with quite sophisticated hardware and software. This thread is currently up to 429 posts, ;)

Cheers, Alan.


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