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Latest Cumulus MX release v3.4.6 (build 3070) - 23 March 2020
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How is this happening?

Discussion specific to Davis weather stations
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mike98
Posts: 1
Joined: Thu 20 Apr 2017 12:07 pm
Weather Station: · ‎Personal weather station
Operating System: Windows XP SP3

How is this happening?

Post by mike98 » Thu 20 Apr 2017 12:13 pm

I switched to using the Cumulus software with my vantage vue. I recommend this highly for everyone.

Anyway, solar radiation is showing up in my graphs and it looks correct. How is this possible? The docs make it clear the vue doesn't have a solar radiation sensor. I've got two theories ...

1) It is taking the measurement from the solar cell meant for charging. This wouldn't be terrible accurate but it seems possible.

2) Cumulus is getting the information from a web service and showing it, but I didn't think Cumulus did anything but show the station info.

User avatar
mcrossley
Posts: 6134
Joined: Thu 07 Jan 2010 9:44 pm
Weather Station: Davis VP2
Operating System: Stretch Lite rPi
Location: Wilmslow, Cheshire, UK
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Re: How is this happening?

Post by mcrossley » Thu 20 Apr 2017 12:31 pm

Are you confusing the "theoretical solar irradiation" value that Cumulus calculates, with an "actual" value from a sensor? The theoretical value will produce a nice smooth curve, the actual values don't (unless it is perfectly cloudless sky).

If you are getting "actual" values, has your base station locked on to some else's VP2 transmitter that does have a solar sensor?

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