Instructables
Picture of Non-PV Solar Power
IMG_2467.JPG
IMG_2448.JPG
Edit: Sweet, I'm on hackaday!

Hello, in this Instructable I will show you how to generate solar power using inexpensive solid state parts and without PV (photovoltaic) cells or panels. I wanted to make this project to see if I could beat the dollars per watt costs of commercially available solar panels.

You only need a few inexpensive parts to build one. It is pretty easy to build and very simple. As far as I know, my idea for the combination of thermoelectric coolers and Fresnel lenses is original... but it's probably not.

Sorry about the rubber bands and foam but remember this is an experiment on my part. Rubber bands are just the best thing for me! Likewise, I recommend you also build a prototype and if (when) it works you should go on to more fancy enclosures. Remember this is just a rough guideline and you can modify it however!

How it works:
This generation method uses a Peltier cell to generate electricity. Peltier cells are designed to be used as heat pumps. When you apply power to a Peltier cell, it begins pumping heat, and one side becomes cold and the other, hot. However, you can do the opposite and generate power from a temperature differential on the sides. To generate this differential, a Fresnel lense focuses light onto one side of the Peltier, and it becomes hot. The other side has a heatsink attached along with a fan that is powered by the Peltier.

Disclaimer:
Lenses concentrate light, which is absorbed by everything, and when light is absorbed, heat is created. You can easily burn yourself and other things with the lens. Don't leave this out uncovered because the sun moves and it might focus on something. I disclaim all responsibility for anything ever.
 
Remove these adsRemove these ads by Signing Up
1-40 of 96Next »
astral_mage6 months ago

go here if u want decent prices.

http://www.customthermoelectric.com/

Dhakian11 months ago

I don't know much at all about optics. Would it be feasible to use a hook up a series of lenses and heat pumps into an array? Would there be any advantage to this? (I'm new to the DIY-energy community.) Along with that, would it be possible to use a more more concave lens, closer to the Peltier cell?

desertrat66610 months ago

im getting interested in peltiers as backup, not replacement to solar.i think your math is off tho, you stated $10/watt is on par with solar. i can get solar for .70 to $2.00 a watt (depending on panel manufacturer) anywhere (ex. home depot 105 watt 12v panel for $159.00= approx. $1.60/watt)

maovi2 years ago
nice
jomac_uk4 years ago
Just a thought, if you use a peltier cell and a freshnel lens to generate electricity and you have a bank of them in say a 1m X 2m area, will the set up generate more or less electricity per given area compared to solar PV's?
Depending of the elements you will be using -You can expect more or less 1Kwh per 1m X 2m area of peltier.
But the problem is - You willl need a pretty BIG freshnel lens or BIG solar oven and 1m X 2M heat sink too.... that's a huge thingy.
Nice job - I've been thinking of heating a peltier element with my solar oven to generate a little electricity, but haven't tried it yet.
carey1245784 years ago
i bought a fresnel lens as a magnifer at Barns and Noble
likewho4 years ago
I’ve tried standard peltier modules with limited success and very short service life. They cannot hold up to the higher temperatures necessary for good power generation performance. I found a terrific supplier with both standard temperature and high temperature TEG modules designed specifically for power generation. They sell a lot of devices on eBay and you can also buy from them direct. The company is Thermal Enterprises and here is are links to a couple of their eBay items.

http://cgi.ebay.com/ws/eBayISAPI.dll?ViewItem&item=310148993913&ssPageName=STRK:MESELX:IT


http://cgi.ebay.com/ws/eBayISAPI.dll?ViewItem&item=310209561834&ssPageName=STRK:MESELX:IT
bananafred (author)  likewho4 years ago
They don't even provide the chemistry... whats to prove their better or different from normal TEC modules? And wow, you look a lot like a shill, with all of your comments being promoting these items.
I would like to see someone build a 3-stage solar power generator: a photovoltaic cell connected to a peltier/seebeck unit connected to a stirling engine. Actually, the peltier/su could go on either end of the stirling engine. I wonder how much power one could get out of such a setup.
I know I'm replying to myself, but oh well. I had a rethink of my idea, and came up with this setup: take an old satellite dish, line the concave side with small photovoltaic cells (1st power source). The pv cells, being shiny, would reflect some light, and being mounted in a satellite dish, would focus the reflected light onto a seebeck unit (2nd power source) which is mounted on the stirling engine (3rd power source). Would this not work?
arbit3r4 years ago
 Hey interesting project. First thing I've heard of peltier cells and they look pretty interesting. I'm thinking maybe a bank of peltier cells heatsunk one side and fed with a heated liquid from a solar panel (liquid type not  pv).
(removed by author or community request)
I have that book too, DNA replication is complicated : (
ha haaa  you got that book to! it sucked and i hated it so much!!

my friend got so pissed he threw a knife at that book!!
 mine looks like like crap because its my school's, but it's the same book

nice job on ur project,
i got an ideer:  if u focus the light on a black container or can filled with water coundt u make a solar powerd sterling engine???
(see sterling on instructables)
I saw something similar in concept to this on Daily Planet, once.  A company in the southern states makes big parabolic mirrors that focus light onto a single point, and run high efficiency stirling engines from the heat generated at that point.  The stirling engines are then used to generate electricity.
scubascooby5 years ago
How hot do PV cells get in sunlight ?

Is there any benefit in putting a peltier on the back of a PV cells to harvest the heat that would otherwise be wasted ?

Kaiven5 years ago
Ooooh! Brilliant! So in theory, anything that uses electricity to produce heat can use heat to produce electricity?
Padlock Kaiven5 years ago
No. Theoretically, heating an oven will not produce electricity. Logically, heating an oven will not produce electricity. Period, heating an oven will not produce electricity. Ever.
Kaiven Padlock5 years ago
Oh, well I have a gas stove, not electric, so I wouldn't think that :P
Padlock Kaiven5 years ago
;-) Theoretically, heating a toaster will not produce electricity. Logically, heating a toaster will not produce electricity. Period, heating a toaster will not produce electricity. Ever. I've never seen a gas toaster...
Kaiven Padlock5 years ago
But I don't own a toaster.
Padlock Kaiven5 years ago
Work with me here...
Kaiven Padlock5 years ago
Heating an incandescent lightbulb won't create light?
Padlock Kaiven5 years ago
I'd think that if you heated an entire incandesent lightbulb to somewhere along the range of 2000 to 2500 degrees celcius, it woundn't produce any light. Why? The pressure differentials from the vaccuum in the bulb and the atmospheric pressure might be just enough to break the glass at 2000 degrees. Anything above 2300 and the bulb will melt. If you could somehow heat just the filament, then it would create light. Thus, they run on electricity.


 if you put an incandesent lightbulb in a microwave it will light up
I wouldn't think so. I'm too afraid to try it, though; I have an expensive microwave.
 no, it really does. It does not, however, make the filament glow, the microwave radiation interacts with the inert Argon gas, making the gas sort of arc to itself, sort of. The effect is that the gas inside the bulb glows in a wide array of colours, but the reaction of the microwaves with the gas also generates quite a lot of heat, which, after about 30 second to a minute, causes the glass to heat up to the point at which it melts and fails, with a bang of sorts...then you are left to explain this very strange looking melted light bulb :)
Actually the cause of the lighting is arcing between various points of metal within the bulb. You can get the same effect with a small piece of crumpled tinfoil (or aluminum foil for you purists) The microwaves create electrical potential differentials that cause arcing from one pointy spot to another all over the place. There is actually a low grade vacuum inside an incandescent light bulb not gas. Argon, Neon and other "Noble" or inert gases are used inside plasma balls to create the colors. Even a fluorescent bulb has a vacuum and any colors seen are the reaction of the fluorescing powder inside the bulb to UV radiation from the arcing.
And this is the brilliance of collective knowledge. I have provided the evidence, you have provided the explanation and those who read these streams of comments and investigate the evidence provided before them will benefit from our melding of minds. I thank you for your information. :)
It's like a mini-Wikipedia. Don't ya love crowd-sourcing?
That's a more sensible explanation. I was trying to figure how microwaves reacting with the filament could heat it up past 1200 degrees. That would have to be one heck of a microwave.
 did you watch the video :D
Yes. Not with the sound, though. So if he said something that I missed, well, i missed it.
 lol...that's ME! woo! I microwaved a light bulb and recorded itjust for you :P

in the video I give a brief analogy of the process takingeffect...nothing you can't gain from the post above (Oct 12, 2009. 10:01 PM)


1-40 of 96Next »