Introduction: How to MAKE PV Solar Panels

Picture of How to MAKE PV Solar Panels

This is not "How to make PV Solar Cells".
It is possible to home-make Copper Oxide and other kinds of materials
but that is a whole nother story which I may do in the future.

I may be a little bit ambitious to try to show you how I made PV
Solarpanels out of various types of cells I collected and how and
where I obtained them rather inexpensively, and some of the differences
in the various kinds, but most of all, how to work with them to get
free electricity under the light of the sun and other sources of light.

In essence, this involves ways to connect cells, which may produce
more or less than one volt, and not only try to increase power output
but also decrease the load, that is, efficiently conserve the energy
whether it is meager or significant.
For example, even the weakest solar panels can run watches,
calculators, radios, charge batteries, and if a computer were
specifically designed to, it would be as solar-powerable as a calculator.

Here are some pictures of Solar Panels which I have constructed.

Step 1: Supplies and Sources

Picture of Supplies and Sources

What you may be able to use to build a useful solar panel:

"Broken" solar cells. They are very cheap and they work, they are
just randomly shaped. They are usually crystalline silicon ones,
which ALWAYS (ha!) look broken even when they are not.

Surplus solar cells. Amorphous silicon printed on glass (check) are
excellent, usually producing more than a volt, and much sturdier
than the thin ones that break in bulk quantities. If these break, we
can fix them, usually.

Indium Copper Selenide Cells. These are "new" and are conveniently
sold as glass tiles with easy to solder tabs.

Any of the above, sold as cells prepared for assembly into panels;
in other words, complete and solder - ready or with wires and tabs.
(I will explain how to prepare inferior quality cells in this instructable.)

Miscellaneous items:
Wire Glue - There is already another instructable for using wire glue
on Broken solar cells. (link)

Brass extrusions, bracket |_| shaped - Convenient for connecting to glass cells.

Solder
Soldering Iron - low wattage
Small flat-head screwdriver
Thin (around 20 AWG or less) stranded copper wire

Lamp cord or Speaker Wire
Alligator clips

Deep Picture Frames or Shadow Boxes (Enclosure)
-look for imported frames at the El Cheapo store and pray a machine made them

Acrylic/Lexan/Plexiglas/Etc clear polymer sheets
Router or Dremel to cut out the middle of one out of three sheets
RTV (Silicone Glue) - or :
High Temperature Hot Melt Glue (Caution-you don't want the sun to melt it!)

Rectifier Diode such as 1N4001 or 1N4004

Voltage doubler or multiplier circuits (you can make) to increase voltage output.
-examples: ICL7660, MAX1044, MAX232, etc.

Wide Sticky Tape
Double Sticky Foam Tape

Rechargeable Nickel Batteries
Gel Cells or Car Battery (you got one, might as well use it until it's useless)
-Li Ion not recommended because they are harder to charge

Analog volt meter (only because it doesn't need batteries like a digital one)

AC Inverter - if you are charging a powerful battery and would occasionally
run some mains-powered appliance. Some UPS's can be easily modified to
be inverters, if they can be turned on after a power failure.

Sources:
Broken Solar Cells:
Herbach and Rademan
Silicon Solar
Electronic Goldmine

Glass (Amorphous) Solar Cells:
Electronic Goldmine
Note:Other links here may also supply Glass Solar Cells

Indium Copper Selenide Cells:
All Electronics
Edmund Scientific
Electronic Goldmine

Other sources:
Cheap weather damaged solar powered outdoor night lights
-(common failures are circuit corrosion and defective batteries, not the solar cells)
Defective solar calculators, solar charged flashlights, etc.

Perhaps a little off topic:
For a reasonably good deal on Complete and Useful Solar Panels I recommend
"Solar Car Battery Chargers" that are about 1 or 2 watts and between $20 and $30,
whenever an opportunity to get some arises. But those are what I am trying to show
how to Make an approximate equivalent of.

Step 2: How to Use "broken" Cells

Picture of How to Use "broken" Cells

They are the crystalline ones that Always look broken, but if they really are,
then they have not been fully prepared for use. It is an extra challenge to
solder wires onto them but this is how I do it:

Look for the wide line on the pieces, and sort out ones that only have
thin lines. The thin line ones might be useful with Wire Glue but are
too hard to solder.

Then sort the pieces with wide lines by how big they are. They will all be
about 0.55 volts but the larger pieces make more current than the smaller
pieces and it's nice to have a panel with consistent current, especially
the one you make with the biggest pieces.

Let's save the big pieces until we learn to do the small pieces.

Strip apart a short length of stranded wire and put the now loose strands
in a small box just so you can find them and so they don't wander into another
project and cause a short circuit.
ACTUALLY another option may be to use wire-wrap wire instead of bare strands,
if you don't mind stripping the end of each piece.

The broken cells have a very thin conductive layer on the blue side and
a very rough thicker one on the other. It will be more challenging to solder
onto them than on perfect cells but this is how.
First the blue side...

Step 3: Preparing Broken Cells

Picture of Preparing Broken Cells

If you can solder onto the cells then they are higher quality than the ones I have
so you can skip these preparing steps:

On the blue side, scratch the thick line with a very small flat screwdriver with just a little force
so that the cell doesn't break, and the line should turn from white to shiny unless it's already
shiny and ready to solder. Try to make a little shiny circle. We will solder there.
Make the flat edge of the screwdriver completely touch the scratched area so it rubs wide.
Mostly push back and forth so that the rubbing removes the thin oxidation.
After scratching the line, turn the cell and scratch the circle back and forth again.
Maybe turn it once more and scratch it once more.

Now flip the cell over and notice the rough stuff on the back. If there appears to be
two different roughnesses or shades of grey, we are going to scratch in two places.
Again, turn the cell and scratch it in one or two little circles by pushing the edge of the
screwdriver up and down to remove the coating that solder won't stick to.

Now back to the blue side. Try to get a solderball to stick.
If it does not stick, and rosin gunks up the area, scrape it off and try again,
and if it seems hopeless, scrape another part of the wide line on the cell.
I did not have the problem because of practice.

Now try to put a bump of solder in the two places scratched on the bottom of
the cell. I was only able to get one bump to stick. There are areas on the
bottom where solder just won't stick. But if neither spot sticks, try scraping the
rosin off the spots and soldering again, or carefully scratching another spot.
If you have a bump on the blue side, it's good but you can't lay the cell flat now.
The spot that worked was rougher and thicker than the one that didn't, and
that means there's a lot more silver there, and more likely it will solder.

Now that you have two solder bumps, you can attach two thin wires,
either strands from stranded wire, or thin wire-wrap wire.
What about thicker wire? It can pull the lines off the cell and then you can
forget about soldering it. Put it in the "wire glue" bin.

Now that there are two wires on the cell, test it with a meter. The Blue side
of the cell will make up to 0.55 Negative volts, so connect the meter PLUS
to the wire on the silver-gray bottom of the cell. My cell isn't getting much
light but the meter needle is indicating that it is making electricity.

Step 4: "Broken" or "crystalline" Cell Panels

Picture of "Broken" or "crystalline" Cell Panels

In the last step I mentioned that the Blue side is Negative and
the silver side is Positive.

Now all you have to do is solder your cells in Series to get
more voltage. To do that you only need one more wire for
each additional cell you add.
Remember each cell makes up to half a volt, so consider
a 12 volt panel to have 24 or more cells. A few extra is good.
One reason for that is a diode lowers the voltage just a little bit,
and another is that it's nice to have 12 volts for charging batteries
when it's not the sunniest time of day. A diode is used when the
panel charges batteries, so the batteries don't give any power
back to the panel in the dark. That would be a waste of free power.

Because the cells are so fragile, it would be good to install them
in a deep picture frame (shadow box) with double stick foam tape
or RTV glue. Be careful, this is permanent. You could make it
less permanent with hot-melt glue also.

At this point you don't need to think that the cells are "already broken",
and you will have a well working panel. You could hide the shard-shapes
with fluorescent lighting diffraction plastic over the framed panel if you like.
Perhaps you've seen a shard-cell panel just like that being sold before.

Step 5: Preparing Glass (Amorphous) Cells

Picture of Preparing Glass (Amorphous) Cells

I received a surplus glass cell with instructions on how to use copper mesh
to make a connection to the glass cell. The glass cell was pre-scratched in
the area where the mesh and wires were supposed to go. But... even with
the copper mesh, it didn't stick. It was doable, but hard to do, and not very
strong. All the wires pulled off. Some of you may have had success with
using copper mesh soldered to scratched areas of glass cells, but there is an
easier way.

Perhaps you have a broken / damaged glass cell. You may still be able to use it,
unless the damage has made the glass transparent, in which case there is severe
damage to the photovoltaic part of the cell.

One interesting thing about the glass cells. Looking at them, you see lines, just
as you may on "broken" or "crystalline" cells, but those lines are not current-
collecting conductors. They are gaps between areas of the glass cell that each
make about half a volt. So, glass cells can be expected to have 2 lines for every
volt of output. And they can make 6 or 9 or 12 or 20 volts.

So, we want to connect the wires to places with the most amount of lines between them
to get the highest voltage. And out the wires on the silver side, of course.

Scratch the silver (probably aluminum) near the edges and test the voltage and polarity,
for your information. I usually use a red wire for Plus and a black or green for Negative.

Easy connection method:
You need two brass extrusions, carefully cut with a dremel (safety goggles!),
and wires soldered on this side of the extrusions ---> C
The extrusion must have enough space inside it for the glass cell to fit.
The extrusion is then crushed a little (before putting it on the glass)
so that it will bite the glass with some pressure and make contact with the scratched edge.

Slide the crushed extrusion onto the glass. If it's too crushed it won't go on, so pry
it open. If it's not crushed enough it falls off, so crush it more. When it bites, and
there is voltage in the light across the two extrusions, put stickytape or
just a little plastic cement over the extrusion to help it stay there.

The Glass cell is now ready to use.
The long one shown is actually two 9-volt ones on one glass, and is the one
that I put extruded contacts on because the copper mesh wouldn't stick..


Step 6: Preparing Copper Indium Selenide Cells.

Picture of Preparing Copper Indium Selenide Cells.

These are rather well prepared already.
They have easy to solder tabs, and are marked which end is Negative with a
dash of a black marker.
The ones I got, I mounted in frames and in an acrylic polymer sheet sandwich.
Three in series ... in parallel with three more in series ... makes nice 12 volts.

I have been advised that these cells undergo some kind of reaction if first exposed to
full sun with no load for about 15 minutes, and that the result is good. I'm told that the
result generates more output than if they are not treated this way. Just FYI. I didn't
notice the difference between the panel that had pre-sunned cells and another that
didn't.

The cells are glass tiles that appear to be made similar to the Amorphous glass,
but they are more efficient, and produce around 4.5 volts and 100ma each in full sun,
approximately. As they say, your mileage may vary. I have no advice for broken
CIS cells.

It is very easy to connect CIS cells together. Peel back the tabs a little, which point to
each other under the cell, and start to peel back the stickytape that holds it on,
just enough so that you can solder them in series.
And watch the polarity! I goofed it up a couple of times.
No damage done, but I had to do it over.
When soldering, wet the ends of the tabs with solder, then press down quickly
with a popsickle stick or something to flatten them against the bottom of the cells.
The cells go together nicely like tiles.
With moderate carefulness, you don't need to worry much about ruining them yourself,
just don't leave them alone with curious people until your panel is done and safe inside
a solid frame. I've fastened them with both RTV Silicone and double-sticky-foam-tape.
I prefer the Silicone glued result, with the cell tiles grouted against the glass from behind.
(No silicone between the cells and the frame glass)
DSFT (foam tape) is more likely to (it has, in fact) let go of a couple of the cells.

As mentioned before, although I don't know if it's necessary for CIS cells, use a diode
when charging batteries with the panels.

Step 7: Applications for Small Solar Panels

Picture of Applications for Small Solar Panels

The solar panels I made and pictured generate around 1 or 2 watts generally.

These are the applications I use them for:

Charging batteries.
In the blackout of 2003, those batteries ran our blackout party,
which included black lights, fans (it was a hot day), radio, small TV, and low voltage lights.
And an AC inverter.
(I go to the rechargeable battery recycle bins with a meter and if they are not really dead
then I borrow them until they are. I didn't buy any of these batteries.)

Solar night lights - nowadays a very common thing where I live.

Solar powered fans - although my solar panels run computer fans directly when it's hot,
(The sun makes it hot, and the sun runs the fans!)
I notice that solar charged battery powered fans are MUCH MORE POWERFUL.

Solar Flashlights

Solar powered radios - including my ham radio shack.

ABOUT SOLAR POWERED COMPUTERS
I guess people don't leave their laptops in the sun...
My approach to designing a solar powered computer,
(and my definition of computer is a processor with memory
and a keyboard and a screen that runs not-necessarily-an-operating-system)
is to use very high resistance CMOS chips which use very little electricity,
just like watches and calculators... a computer is also a calculator with lots
of memory, and CMOS memory is a common thing!
At night time, the computer has not used up all it's solar power so it uses
what is stored in the rechargeable battery.
There is simply no demand for the solar powered computers,
nor any obstacle to solar powering a PDA or a laptop with similarly sized panels.

DUTY CYCLES:
In simple theory, if you get eight hours of sun and need one hour of power,
you can get by with one eighth the solar power by saving it up in batteries.
Also, if LED lights should run all night, it's easy to collect more than enough
solar power during the day in batteries with the right sized panel.

Step 8: Getting More Practical Power From Your Panel

Picture of Getting More Practical Power From Your Panel

It is very easy to get a few solar cells and put them together into a panel,
but sometimes it gets expensive to get enough cells to make a useful voltage.

If you obtained one or two large cells, you may have a whole watt or two,
but only a volt or less, and that's sad. Not too many things run on less than
a volt.

Perhaps you got enough big broken cells to make 6 volts , but wouldn't it be
nice to have 12 volts? Then maybe you could keep a battery charged and
occasionally run an inverter on it.

In the last step I mentioned how time could be used to save up power for
another time when it will be used. And a small panel can make enough
power over a long time to run a big load for a short time.

In this step I am talking about matching the voltage of the panel, whatever
it may be, to the voltage that you find useful. Or generally, matching
supply and demand in a satisfying practical way.

It may be possible to design a 2 volt circuit for a 2 volt panel, but unnecessary.

It is possible, although as far as I know, using obsolete Germanium transistors,
to get any voltage out of a big half-volt cell, and I don't know a modern way,
so I'll leave that idea alone.

But there are many voltage doubler or multiplier circuits that work at slightly
higher voltages, and I see that I've made a few panels around 6 volts which
I'd like to get 12 out of. There is a voltage doubler chip still available called
ICL7660 or MAX1044 that is very convenient to use. So I will use it as an example,
since I'd rather have around a watt at 12 volts than at 6 volts.

There is something else I did that was very obvious in the picture for step 1,
where I had 3 "broken cell" panels around 6 volts and put them in series to get
around 18 volts... and since the cells were large that array has a lot of current.

But if I use just one 6 volt panel and want 12 volts, I use the voltage doubler
and get twice the voltage in exchange for half the current. AC transformers
do the same thing... almost the same power goes out as goes in, but at a
more useful voltage. Some circuits that do this are called "DC to DC converters".




Comments

creektilghmank45 (author)2017-07-03

if you want to know how to make some of your diy stuffs yourself , just go to inplix website. There you'll find your answers.

BarbaraJ5 (author)2015-05-15

There are so many interesting posts regarding this topic, people share information and experience. But unfortunately it seems do easy when you ready the instruction though when you try to create something it turns into… sorry, cannot find decent words. So, we also spent quite much money but as the result got nothing and applied to solarpanelscompany.com to have solar PV installed. In such a way I can calculate the costs and efficiency as well as invite specialists in case I have some problems.

mphillips13 (author)2012-07-25

What is it with these people and emails? Are those spammers? I mean you are giving very detailed instructions on this and they want you to email them with detailed instructions? LOL. I put you in my favs this is great! Most just have instructions but I need pictures too so yours is easy to follow.

diolt (author)2011-05-10

Interesting & informative post. Please can some one clear how many panels required to generate 1000 Volts?

evomr978 (author)diolt2011-09-12

at least 1,587 high efficiency cells. If each cell is producing a minimum of 0.63 V.

ed_loy (author)2010-08-12

what are the sources of those cells?

lhouse (author)ed_loy2011-08-16

Ebay, broken cells

scraptopower (author)2011-06-19

Thanks, good instructable!

What's with all the people asking you to email them how to's ? Didn't they bother to read this ?

ehudwill (author)2011-06-18

Nice informative instructable. Thanks for sharing.

lizman (author)2011-02-08

Thank you very much!!!!

Cleasonsook (author)2010-06-19

would like to know about "ICL7660"

When I check my local Electronics store
they list 3 different versions

ICL7660CPA
ICL7660CSA
ICL7660SCP

dose it make a difference which one I pick ?

ntn923 (author)Cleasonsook2010-08-16

It shouldn't make too much difference. The different letters at the end are often just differences in max levels, whether of efficiency or of other small details. For a small project like this, any of the three should work fine. If you'd like more info on the chips, the datasheets can be found on alldatasheets.com, ti.com, or most other electronics providers sites.

napjax3000 (author)2010-07-11

Very nice article and illustrations. You gave step by step instructions that were easy to understand. I've seen a few more of these on other sites, but got a little lost. Keep up the good work.

AlphaTwin (author)2008-07-23

Pretty Darn cool, I've got a little different angle on this. Let me explain. I live in the Midwest U.S. It's gets pretty darn cold/expensive in the winter. With the price of Corn sky rocketing it's no longer cost effective to heat my house with my corn burner. So I started playing with electrolysis to make Hydrogen to burn in my Natural gas Furnace. The problem is if I do this with the grid I'm burning coal not to mention it would be more efficient to forgo the electrolysis step. So here's what I want to do. I'd like to keep a battery charged from a solar panel. My output to the electrolyzer from the battery will be about 12 volts at 20 amps. Keep in mind it will only run for about 10 minutes every 20-30 minutes . That's it, if I can get it to work it will save me about $2000 a year in heating expenses.

evanpnz (author)AlphaTwin2010-06-11

Be very careful - hydrogen is a dangerous gas. One little bit of air in there and you have a bomb. I will explain a little more. Hydrogen is the smallest gas molecule you can get. So it leaks through almost any sealing material. Also because of its low molecular weight it reacts with oxygen very quickly which means its "burn rate" is very fast. A lot of the reason you are not already driving a hydrogen powered vehicle has to do with these properties - many millions of dollars have been spent trying to make hydrogen safe to store and make it burn slowly enough not to destroy the engine.

fyrspark (author)2009-04-11

i've been interested in wind energy as well as solar energy for a while, I want to build my own wnd generator but there are many versions and ideas, can someone point me in the right direction and just tell me how to do it. what type of motor especially, the design portion I have down but getting the motor to produce energy is the confusing part, i.e. what kind of motor is the most effective.

Rotten194 (author)fyrspark2010-03-15

https://www.instructables.com/id/Chispito-Wind-Generator/step2/MATERIALS/
This instructable mentions electric treadmill motors.

SoCell (author)fyrspark2010-01-28

I have heard that a DC Motor made by Ametek is what you need. These motors will produce DC current when they turn backwards. You attach your blades per your design and it should turn the motor backwards. You will want a 30VDC Motor with a low RPM rating, under 400RPM @ 30V is the best bet. I hope this is helpful in some way.

digimancer (author)2010-03-14

Large umbrella mounted solar panels. Just a thought, might be heavy...

diamondwillow (author)2009-09-06

Hiya folks. Just want to say thanks for the site. Loads of info here. I currently live off grid entirely. I have 2 solar panels, 1 X 32 watt and 1 X 80 watt. They are in series and charge 2 deep cycle 12 volt batteries, {deep cycle is VERY important...they can be drawn down and recharged many more times than a regular auto battery) no charge controller because I use the power and the batteries never "cook". My house runs mainly on 12 volt: tv, radio, lights, and I have a small inverter to run my laptop (low power draw) and to charge my pager for the fire department. Living in northern Ontario, our winters are long with short days... only 8 hours of limited solar charging time for the panels, so I am looking for ways to add to my panel bank to keep things better charged up in the winter.I sometimes need to run a generator in the winter to run a charger for my batteries, and I'd like to get away from that, so I am hoping this is the way! Thanks to this site I am now exploring more possibilities! Physics and chemistry and mechanics are NOT my strong suit, but since it is a way of life for me, I am highly motivated to learn how to build panels myself, instead of paying close to 10 bucks a watt for retail panels. Cheers!

telebong (author)2009-08-14

thanks to all concern, sites like this evolves ,very helpful and informative!!!!!

du1200 (author)2009-07-24

I'm glad to see someone who's truly interested in helping the planet instead of making a profit!!!!

norkaz (author)2009-06-15

Many thanks for this highly instuctive article from a land of sunshine and very expensive solar panels! Thanks!

nowuknowjack (author)2009-05-24

My comment was deleted, don't know why, but I'll post it again as many want to get cheap parts and recycle broken parts. The solar powered traffic highway warning signs on trailers get damaged by just getting hauled around or encounters with drunk drivers etc. anyway they have to be fixed and the broken panels go into the dumpster many times. Look in the phone book for places that rent these signs and see if they have any broken panels you can experiment with. Many times they might just give them to you.

junits15 (author)2009-03-21

Is that plexiglass? Where did you buy it? I can't find any place that isn't obnoxiously priced!

wibrle (author)junits152009-03-23

I found plexiglass at lowes, when I was modding a computer case. Have you tried looking there?

junits15 (author)wibrle2009-03-23

I've always known lowes to have it I just though it would be pricy because it is an actual store. How moch did you pay? How much did you get?

wibrle (author)junits152009-03-24

For normal 1/8 inch thick plexiglass (in US currency) $43.99 for 36"x72", $6.77 for 18"x24", and $19.37 for 24"x48"; there where more sizes, but this gives you an idea. For the thick 1/4 inch plexiglass $13.49 for 16"x24" and $42.97 for 24"x48". Lows also carried high impact plexiglass, but it was high, so I didn't bother looking at the prices.

doobiesh (author)2008-03-31

hey guys I have a solar panel which is from radioshack but I'm not sure what is the top plastic layer is supposed to be. it looks like a bunch of tiny lenses but I'm not sure what they are.

DualPhase (author)doobiesh2009-03-03

Did you ever burn ants as a kid.... Same principle, just a bunch of magnifying lenses.

ElectroFox (author)doobiesh2009-01-12

Doob, they are basically mini-fresnel lenses to focus the sun's energy. They use a similar technique on motion sensor lights to for focusing infrared energy to the sensor.

DualPhase (author)2009-03-03

So are there any recommendations on some places to go to find these broken ones for the cheapest?

Donald Nathan (author)2008-11-28

A very good project.

dasl (author)2008-11-21

i want to make solar cell but unfortunatlly im not good in electronics and tell me how connect wire with glass

MeadowMeeder (author)2008-11-06

Thank you!!!!!

Ausi319 (author)2008-10-20

where can i get the solar cells?(broken) and i can put them together i'm thinking about making a battery/solar powered go kart!

panstar1 (author)2008-09-13

I did buy broken solar cells from goldmine. I thought if this work all right !! but if it didn't it was only $9.00. What I got though was really quit useless except for really small projects. It would be better to just wait and buy a panel made for charging then it would be to do this even so canadian tire ( I am in canada) sells small panels for around 20 to 30 ,even a 15 watt panel goes on sail once and a while. but for me I just don't think would think help me solve my problem. IE. parents have a camp not hydro so they use a generator /battery iron lead I think so I though this instrucable could have been useful. But all in all this would be good for cell phones or mp3 ,i-pods though. I hoe tis is useful

Sandisk1duo (author)2008-05-17

wait, so in the circuit (voltage doubler) ground is positive??

Electronic-goldmine has super cheap solar panels right now, $1.00 for 0.5v and 0.4-0.5 amps i'd buy them, (If i had a credit card.)

Etitan (author)Sandisk1duo2008-07-23

Quick note:
Watts = volts * amps
so .5 v * .5 amp = 0.25 w for $1 (the link now says $1.89), which comes to $4 ($7.56) per watt

I mention this more as a warning, I've seen a few places offer solar cells or "cut"/broken down pieces of panels for prices about this, where when all is said and done the price doesn't work out to be a good deal at all.

Sandisk1duo (author)Etitan2008-07-23

ya, the PV cell's aren't on sale anymore, bummer, got any links to fully functional, non-broken, cells? (which are cheap)?

darcylu (author)2008-07-18

I am just getting interested in solar/renewable energy (thanks to ed!) so please forgive my ignorance. After looking at panel system prices, even w/ the rebates & tax incentives can still be quite costly... this is why I am now researching building our own solar panels. After reading the comments on Oct 1, I take it your instructions are for small scale ? not full house operation ? I have been printing & reading all kinds of info but have no electrical tech background so I am confused... please advise if I am on the right track...

VIRON (author)darcylu2008-07-18

I consider the DIY making of solar panels from broken cells practical for charging 12 volt battery systems. It seems to me and my friends the best market value for ordinary solar panels is currently about 4$USD per watt. But broken cells can be obtained cheap if people are willing to do a little extra work to make them useful.

John Smith (author)2007-08-13

Not my kind of thing, but it was VERY well written, and even I understood most of everything. Excellent job.

orange29 (author)John Smith2008-05-03

You would think that in the 21st century, the price of solar panels would be less.

I plan to add some articles on solar panels to my website 'Ideal Homes'

stantheman1955 (author)2008-04-11

I would be interested in hearing the feasibility and possible construction design thoughts to buying broken cells and creating a grid that would fit on a roof of a house in central Florida that measured say 25 by 60 feet. How much potential out put could be realized using the step up circuit mentioned in one reply. I would like to explore using clusters of led lights through out my 1000 so ft house from a battery bank and only use the grid for what is absolutely necessary at the moment such as the TV my computer and power tools in my shop. this is a great article and am looking forward to reading about what others are doing and one day contributing my self. thanks for your advice.

rpvanpatt (author)2007-10-01

I am wondering how much power you can get from something like this. Also, what you could power or charge with it. And this may sound stupid, but can solar panels receive energy bouncing off a mirror? Thanks

VIRON (author)rpvanpatt2007-10-01

Solar panels do receive energy reflected from a mirror and occasionally they are used with mirrors to collect more light or collect light from a different angle when the sun moves. In the picture above (IN STEP 1), , I put in series a 5 volt, 6 volt, and 7.5 volt panels I made from broken cells which were sorted by approximate size. The 5 volt panel made about an amp in full sun so it's 5 watts. The breaking of a solar cell in half generally makes two cells with half the power. The whole thing with the 3 panels stuck together in series is about 10 watts in full sun, that's over 12 volts and "almost" 1 amp. It can charge a car battery during times of full sun, and when the car battery is needed, it has stored up enough power to give a LOT of power for a short time (which is the normal use of car batteries anyway). I charge 12V batteries with solar panels to run radios (ham or CB) and lights if, when, and where utility power is not available. Usually, 15 to 18 volts panels are used to charge a car battery, so there is still extra charging voltage when it's not full sun. Most consumer car-battery charging panels put out about 200 mA at 15 or 18 volts, and are intended for cars not driven often. A car battery can power small plug-in things (few hundred watts) if they are plugged into an "inverter". This can be scaled up with more cells, panels, and batteries, but then it helps to know a smart electrician. Usually heat needs the most power and is done with water-heating panels, which are plumbing rather than electric. A solar powered hairdryer may be a particularly troublesome thing.

rpvanpatt (author)VIRON2007-10-01

if i were to make some panels like yours, and have a battery, it could run a tv or somethin maybe? or lights? im sory im just tryin to get a feel on how much power(havent taken physics in a while) i can get when i make my own

VIRON (author)rpvanpatt2007-10-01

I have a 12 volt TV that I think works on the 10 watt panel in full sun even without a battery. Small LCD TV's may be even easier to power.

Dr_Acula (author)2007-08-27

Ok, back from the shed. I have salvaged at least 10 watts of cells that I thought were useless so thanks again to this article. One thing I have found is soldering to solar cells - solder fluid (30% zinc chloride) helps a huge amount. Put a drop on the area to solder and wait 10 seconds for it to etch and then solder.

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