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Author Topic: Mini solar panel testing (output when this is cold or hot by the sun )  (Read 209 times)

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Offline Kiriakos GR

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I was not aware how solar heat this changes output when solar panel this is cold or hot by the sun.

This is no major project but rather one quick experiment.
What it is at the back of my head this is a small solar panel system  over my motorcycle helping a bit my battery staying at 13.6~14V.
To do that I thought to combine two supposedly 6.8V 90mA panels, but I got disappointed by their true output when these get warm by the sun.
Today I did order and a third one solar panel, so to test if my project this is possible to succeed.

Its one panel this is 90x38mm, and now by combining three of them I think that I will come close to target voltage.   

Down below they are pictures demonstrating percentage of loss of output of two panels (from cold 30C at max warmer 60C under the sun) and no load connected.
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Offline Kiriakos GR

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Re: Mini solar panel testing (output when this is cold or hot by the sun )
« Reply #1 on: December 01, 2017, 10:42:30 PM »
Finally after 30 Days of waiting  :)  I did manage to double the quantity of these solar panels.

Theoretically  I am having here 4x panels of 5.5V at 60mA ( or also listed as 6.8V 90mA).
I did some testing but I had cloudy weather all day long, and I could not get even 3% of output.

Originally I thought to get just another one panel, but last minute decision was to get two instead so to gain more flexibility and to avoid disappointment.
Either way in few hours I will be able to test my new solar panel, and I will discover it limits.  ;)
   
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Offline Kiriakos GR

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Re: Mini solar panel ( project) working as motorcycle charger = FAIL
« Reply #2 on: December 08, 2017, 07:18:12 PM »
At 2012 I did test such mini solar panels (single unit) at 6V application  Mini project by Kiriakos : Solar powered Agilent U1272A & U1273A and I was aware of what to expect.

This time I did one step forwards by making a theoretical  24V configuration ( 23,600 DCV open voltage).
Today I did confirm for another one time that specific modules peak current this is 60mA.

While entire circuit of solar panel this it did deliver max of it potential, my project about charging the motorcycle battery this failed because minimum required current for this task this must be over 200mA.

Solar panel permanent installation over such type of motorcycle this is BIG challenge because of limited space.
After my last experience today, I am now aware of such concept limitations, and that one 15x9 centimeter (solar surface ) this can not produce usable results as charger of  7Ah 12V battery.

Bellow there is some pictures of my tests,  and test results this is a good souvenir for me,   and one reminder for you about spending more into such projects if you expect usable results.  :) 
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