A form of a joule thief that powers a led light, that shines on a solar cell that is used to recharge the joule thief`s battery. http://www.youtube.com/watch?v=ZrhH3zlOJCM (http://www.youtube.com/watch?v=ZrhH3zlOJCM)
Hi,
I have done a similar test but with a bigger pannel and a JT powering a neon tube recovered from a laptop screen.That light was enough to keep it in self running and have light at the same time.
Kool,,I was thinking I was the first to have been down this road, goes to show,,someone else always has..
Great. How did you modified original circuit of solar garden lamp ?
why this can work?
a solar panel have have 10 % efficency (the best 14%). . The Led will not lightning the fully surface of panel = lost.
If you contruct tha its full lightning. so the light is weaker, and it hve lost that light go also outsides of panel.
also the j.t. converter produces losts !!
it is i,possibel to contruct THIS WAY an electronic-optical (light) PERPETUUM.
Only nice experiments to learn the physics.
Gustav Pese
Quote from: pese on May 06, 2011, 03:27:13 AM
why this can work?
a solar panel have have 10 % efficency (the best 14%). . The Led will not lightning the fully surface of panel = lost.
If you contruct tha its full lightning. so the light is weaker, and it hve lost that light go also outsides of panel.
also the j.t. converter produces losts !!
it is i,possibel to contruct THIS WAY an electronic-optical (light) PERPETUUM.
Only nice experiments to learn the physics.
Gustav Pese
i have this one tested and working but I am using 2 neon tubes from laptop screen.The light covers a bigger surface of the pannel and it does work indeed. I will make a video and post it on youtube.
I don't know what the light spectrum is from the lap top tubes but when I tried this a couple of years ago, I found that the light band emitted from the leds (white) was not an efficient way to supply energy to the solar panel. The band was too narrow unlike sunlight. So, this adds even more to the losses. I even used mirrors to bounce the light all around the solar cell in a box like configuration and still no good.
I look forward to seeing the video with the lap top tubes. Maybe using multiple leds of different spectrums, ultraviolet, infared and white might improve this?
Bill
Hi bill
I was looking at experimenting with those small radiactive light sources (glow paint etc) and solar but ran into the same spectrum problems. The idea was to have a lightsource that did not need replacing for years and ran 24/7 between a solar cell sandwich. Low power but constant. Trouble was the cost lol.
Would be interesting to get a vell and test different coloured leds and a combination.
Mark
Hi bill
you can intensify the light using a fresnel lense. One cell but lots of lights
Mark
Hi Stevenrsd1
Thanks for sharing...what type of garden light did you use and can you scetch out a circuit diagram
Kind Regards
Just a thought
take the led out and put one of those cheap tritium light keyrings in (they go for years ) and see how fast the battery charges up
mark
@romerouk
Have you tried putting a second solar pannel on so you sandwich the tubes? Would be good to see how fast it charges a battery or if it can run an external led light of a few.
Mark
Quote from: eisnad karm on May 06, 2011, 04:53:24 PM
@romerouk
Have you tried putting a second solar pannel on so you sandwich the tubes? Would be good to see how fast it charges a battery or if it can run an external led light of a few.
Mark
I have just made myself a solar pannel from 6 sollar cells each 0.55v/4w.I will take some pictures.
I have placed this cells on acrylic sheet 3mm and I have the tubes on the sides of the acrylic.This way the light is spread uniform.All I can say is that the batteries(2x1.2v) are never running down.In complete darkness the battery stays charged, actually goes up a bit but very slow.
@romerouk
thanks for the explanation. I look forward to the pictures
i am looking at doing something similar using high efficent triple junction cells.
I am also thinking of perhaps using a special fresnal lnese to concertrate the light.
In theory the batteries should run down in complete darkness. What is the maximum time to have run it in darkness (put a box over it?
I gather you are using a JT device?
Kind Regards
mark
I have 4 tubes inside, one for each side.I have used only 2 but I am looking to connect all 4.
The frame is from a large computer screen and the plastic used from the same source.
It seems 'the world' is starting to wake up at an exponential rate and think for once.
Yes this does work and you can get OU in this manner. Despite people thinking otherwise, the principle is similar the the vehicle that can travel faster downwind with the aid of wind driven prop gear linked to the wheels.
Its ALL in the gearing. Circuits are the same.
@RomeroUk
I know how busy you are with the Muller Motor...many others around the world (not just on this forum) are taking notice.
I am asking for a simple request...if you could shoot a 1 minute video of your solar/laptype device running. If you could cover it up and just give a batery reading it would be of most help to me.
Many Thanks
Mark