The Sky is ~5 months new and reported UV in expected range. From this morning, it looks like we’re burning. [20200602_UV] Sensor status shows OK but I don’t think it is OK. I have another Sky in the region and shows ~5-6 at the same moment. Either the UV sensor failed or some algorithm failed.

Clearly a calibration that went wrong. Will ask to get that back ok Seems that just after solar noon you had a clear drop in sun … mislead the system. Sorry for that.

One of my PHP scripts will give you a good idea of what your ‘max’ UV should be for the current time with a clear sky based on your gps coordinates. Just change the ‘lat’ and ‘lon’ to match your location: http://beentheresailedthat.com/ws/server/php/getUvByCoord.php?lat=40.65817&lon=-73.47492 From…

Thanks much for this. I do suspect the UV is a bit high from the replacement Sky I received a couple weeks ago. Will compare when tempest arrives hopefully this week. Thanks again !

Thanks Sam, here in Ohio showing a max of about 6 normally, although my Prod. Tempest is showing peaks of 7 to almost 8 today. Bit high still I think on Solar Radiation peaking today around a kilowatt/sq. m, I usually expect maybe 700-800 tops (unless some cloud edge defraction).

That PHP script is based on NOAA global observations, and compiled into a 1 degree database… Then extrapolated based on your local sunrise, sunset and solar noon, time of day… And day of month. And corrected for UV ‘float’ over the past 10 years. In short… A bunch of voodoo magic. If you’d like to…

Lots of magic going on in that little white cylinder !

Lol. true. I’ve been working on fine tuning this script for over a year…with help from a fellow WF supporter.

So awesome to have online peeps who work to invent and improve.

Looking at UV index again today. The script/formula matches the official weather statements (predicting index of 7 at this hour), but Sky is showing index of 10 at the moment. Avg daily max should be 7 for my city. This is a new Sky unit received in the past few weeks as a replacement. Will have t…

Dan your station seems to get shades around noon quite often. Calibration rejects each time since it is or to shady (cloudy day) or it goes up and down like a jojo FAIL: no sufficiently clear days available during the analysis period.

Merci Eric. Yes the trees tend to cut the sun at around lunchtime. Obviously it’s not a problem during winter time though. Thanks for clarifying. I wasn’t aware this is how calibration worked for Sky. When it arrives, my Tempest will have a clear catch of the sun (different location) so hopefully t…

UV index too high?

Tempest Owners

Topic		Replies	Views
UV seems too high or too low (solved with auto-calibration CL system) Tempest Owners sky , uv	238	12131	April 11, 2020
Low uv readings? Tempest Owners tempest	40	1782	August 13, 2020
Sudden change in UV (CL calibration applied) Tempest Owners uv	16	1161	May 17, 2019
Theoretical UV calculation tool Developers	120	2246	August 23, 2020
UV reading are low Tempest Owners uv	0	709	January 17, 2019

UV index too high?

Related topics