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stmbtwle

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Reply with quote  #1 
Speaking of pyranometers, here's an affordable kit: http://www.instesre.org/getPyranometer.htm

Also available assembled.

Handheld:
https://www.amazon.com/Power-Meter-TOOGOO-SM206-Digital/dp/B01EA3VFKQ/ref=sr_1_7?ie=UTF8&qid=1517498548&sr=8-7&keywords=Sm206

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Solar is like the wind. It may be free, but putting it to work isn't!
Willie, Tampa Bay

pianoman8020

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Reply with quote  #2 
stmbtwle,

I have been building my own pyranmeter test stand for testing movable reflectors,  lens, sun angle intensities, and screens.  I measure in Lux with and Arduino Uno and sensor BH1750FVI  (GY30).  I will be using several at one time. A test setup would include a vertical unit (base line test), an angled uint facing south (ie 30 deg)(as second base line test), a sensor following the sun, sensors inside a collector at various levels.  The GY30 works out better with the internal math and recording to data files.  Light Dependent Resistors (LDR's) are a real pain to work with.

https://www.ebay.com/itm/BH1750FVI-GY30-GY302-Light-intensity-Digital-Sensor-Module-F-Arduino-3V-5V-Power/112770290396?hash=item1a41a212dc:m:mCgtMIm4bUZJ1VZdwDPMVVA

The real question is why do this? It's for developing the Arduino program (and my programing skills) to use two reflectors on my collector setup and evaluate light levels as it travels thru a collector may it be perpendicular or at an angle. The end game is to build a collector with over 110% efficiency. It would be great if I could use the tracking reflectors in my garden during the summer.

Jim from IL
stmbtwle

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Reply with quote  #3 
Why? If you're experimenting, it's helpful to know how much of the available energy you're harvesting, and to do that you have to know how much is available in the first place. You already know that.

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Solar is like the wind. It may be free, but putting it to work isn't!
Willie, Tampa Bay
pianoman8020

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Reply with quote  #4 
It bothers me to see my two ZP-DP 4'x9' collectors setting for days without ever turning on. With reflectors that cloudy day could turn into a productive one. I have compared the GY30 card to a hand held pyranometer using Lux units and it seems to be dead on and a whole lot cheaper. In theory it would be great to open the reflectors/covers when a specific light level is reached a then shut down if any weather problem occurs.

I plan to use electric actuators to move large aluminum reflectors. This would solve a number of year round problems and granted create a number of others.

Humor me now. How about a reflector unit that could be attached to the outside of any south facing window that would track the sun and reflect in light during the day and insulate the same window durning the winter night. A black 40% shade would be needed to reduce the intense interior light.  The back side of the exterior panels could look like shutters and be turned around in the summer to hide the shinny surfaces. Try to find something like the at Lowe's.

Jim from IL, retired and looking to invent some toys.
stmbtwle

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Reply with quote  #5 
Well, as windows can be solar collectors, I don't see why not. I'd build a shutter and operate it manually for a few hours as a test before going to the expense of automation.

The only other problem I see is that when you have the shutters in the summer position, the reflective side will be facing OUT. Might look kinda weird! ☺

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Solar is like the wind. It may be free, but putting it to work isn't!
Willie, Tampa Bay
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