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42 posts

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#227501 9-Jan-2018 17:08
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Hi,

I was interested in collecting some data from a pyranometer, and wondering if anyone had any experience with any pyranometers that are solid.  We like Modbus in general so that would be the preferred method but interested in any recommendations for quality instruments.

Thanks, John


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  #1933010 9-Jan-2018 17:28
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I had no idea what this was, googled it, still no idea.

 

Does it measure how many fish with teeth there are in the water?




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  #1933034 9-Jan-2018 18:19
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Ha! I like that cool - No it's slightly less interesting than that - a device that measures the amount of sunlight in terms of irradiance (in watts per meter squared) and over time insolation (watt hours per meter squared).


 
 
 
 


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  #1933145 9-Jan-2018 20:12

Probably better to ask this question in the gadgets and home automation and electronics forum. Ask a mod to move this thread.







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  #1933240 9-Jan-2018 23:00
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OK I will try thanks


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  #1933271 10-Jan-2018 00:44
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I see MetService and NIWA use the Licor 200 for their global solar irradiance measurements.

 

This sensor puts out ~ 100 uA at full output so you will need a good front end on the sensor to get good readings.

 

https://www.licor.com/env/products/light/pyranometer.html

 

 

 

Not modbus though. You might be able to find a modbus unit in the Kipp n Zonen product range but if they have one it will cost multi-thousands.

 

 




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  #1939022 15-Jan-2018 12:59
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Thanks! Yes that does look like a solid one, I will check the interface but often the distance between the roof-mounted unit and the raspberry pi (or similar SBC) can be a ways. the thing we like about modbus is that it's pretty reliable once running, and you can also bridge it with WiFi devices.




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  #1956914 14-Feb-2018 11:17
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So far we are testing a Rika RK200-03 Pyranometer, and it seems to be working well. Easy to add to a SolarNode (running on a Raspberry Pi) by specifying the Modbus address, and you can chart it. 

 

Click to see full size

 

Click to see full size


 
 
 
 




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  #1958581 15-Feb-2018 12:35
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here's a little more info on this testing:  http://solarnetwork.net/v4/testing-the-modbus-device-plugin/


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