[weewx-user] Re: MaxSolarRad (from pyephm) is not alligned with Solar-Rad from my Weatherstation

[Xant]

Gary is correct to not initiate an Insolation vs Illuminance debate... been 
there, done that.

Please, refer to my previous posting and read the follow-up responses:

https://groups.google.com/d/msg/weewx-user/bUJrHaRnE_w/ajKVjLTtCwAJ

Xant

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[weewx-user] Re: MaxSolarRad (from pyephm) is not alligned with Solar-Rad from my Weatherstation

[gjr80]

Hi,

Your station has a sensor that reports illuminance in lux and the 
fineoffset driver approximates solar insolation using a simple linear 
multiplier. From the comments in fousb.py:

Illuminance and Radiation 
The 30xx stations include a sensor that reports illuminance (lux). The 
conversion from lux to radiation is a function of the angle of the sun and
altitude, but this driver uses a single multiplier as an approximation. 
 
Apparently the display on fine offset stations is incorrect. The display 
reports radiation with a lux-to-W/m^2 multiplier of 0.001464. Apparently 
Cumulus and WeatherDisplay use a multiplier of 0.0079. The multiplier for 
sea level with sun directly overhead is 0.01075. 
 
This driver uses the sea level multiplier of 0.01075. Use an entry in 
StdCalibrate to adjust this for your location and altitude.

Let's not start a debate about the validity/accuracy of deriving solar 
insolation from illuminance, I will let you google that, but you can see 
there is some variation in multipliers used.

Bottom line is it is an approximation and if you want to vary the 
multiplier used you can (effectively) do so via a StdCalibrate correction 
.

Gary

On Sunday, 13 October 2019 16:12:08 UTC+10, Johannes Ebner wrote:
>
> Its a WS3080
>
> Br,
> Johannes
>
> Am Samstag, 12. Oktober 2019 21:36:53 UTC+2 schrieb vince:
>>
>> On Saturday, October 12, 2019 at 8:37:00 AM UTC-7, Johannes Ebner wrote:
>>>
>>> I have yesterday installed pyephm on my Raspberry and enabled 
>>> maxSolarRad.
>>>
>>> I can see it already in my graphs, but the value is much below what is 
>>> coming from my weather station. What could be the reason?
>>>
>>>
>>>
>> What kind of weather station ?
>> Many provide very incorrect values for radiation and brightness etc. 
>>
>

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[weewx-user] Re: MaxSolarRad (from pyephm) is not alligned with Solar-Rad from my Weatherstation

['Johannes Ebner' via weewx-user]

Its a WS3080

Br,
Johannes

Am Samstag, 12. Oktober 2019 21:36:53 UTC+2 schrieb vince:
>
> On Saturday, October 12, 2019 at 8:37:00 AM UTC-7, Johannes Ebner wrote:
>>
>> I have yesterday installed pyephm on my Raspberry and enabled maxSolarRad.
>>
>> I can see it already in my graphs, but the value is much below what is 
>> coming from my weather station. What could be the reason?
>>
>>
>>
> What kind of weather station ?
> Many provide very incorrect values for radiation and brightness etc. 
>

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[weewx-user] Re: MaxSolarRad (from pyephm) is not alligned with Solar-Rad from my Weatherstation

[vince]

On Saturday, October 12, 2019 at 8:37:00 AM UTC-7, Johannes Ebner wrote:
>
> I have yesterday installed pyephm on my Raspberry and enabled maxSolarRad.
>
> I can see it already in my graphs, but the value is much below what is 
> coming from my weather station. What could be the reason?
>
>
>
What kind of weather station ?
Many provide very incorrect values for radiation and brightness etc. 

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