Does your electrical power bill make you want to run up the wall, with the stress it is giving you?
some extra money to pay for
the steeply-priced
electricity? So exactly what can you do regarding
it? The following is some good news for a
change, you can take the
appropriate steps
to make that electric bill lower or completely nill.
You possibly can
learn how to produce electricity free
with those parts with cheapest price than market available.
Two Ways to Make Power at Home
1-Make Electricity at Home With Sun Light.
2-Make Electricity at Home By Using Wind Energy.
1-Make Electricity at Home With Sun Light.
The problem with this case is you have to buy a very costly solar panel (upto 13,000Rs.)
so the solution make a solar panel at home much lower than market cost so the money back period reduces to half or quarter.
Lets start our project
So what is a solar panel anyway? It is basically a box that holds an
array of solar cells. Solar cells are the things that do the actual
work of turning sunlight into electricity. However, it takes a lot of
cells to make a meaningful amount of power, and they are
very fragile, so the individual cells are assembled into panels. The
panels hold enough cells to make a useful amount of power
and protect the cells from the elements. It doesn't sound too
complicated. I was convinced I could do it myself.
I started out the way I start every project, by Googling for information on home-built solar panels. I was shocked at how few
I found. The fact that very few people were building their own panels led me to think it must be harder to do than I thought.
The project got shelved for a while, but I never stopped thinking about it.
After a while, I came to some conclusions:
- The main stumbling block to building solar panels is acquiring solar cells at a reasonable price.
- New solar cells are very expensive, and can even sometimes be hard to find in quantity at any price.
- Blemished and damaged solar cells are available on
Ebay
and other places at a fraction of the cost of new perfect cells.
- These second rate solar cells could probably be used to make a solar panel that would work just fine.
Once I came to the realization that I could use blemished and factory-second solar cells to build my panels, I finally got to work. I started by buying some solar cells off of Ebay

solar cells. It takes a total
of 36 of these type solar
cells wired in series to
make a panel. Each
cell produces about
1/2 Volt. 36 in series would
give about 18 volts which
would be good for charging
12 volt batteries. (Yes, you
really need that high a Voltage
to effectively charge 12 Volt
batteries) This type of solar
cell is as thin as paper and
as brittle and fragile as glass.
They are very easily damaged.
The seller of these solar cells dips stacks of 18 in wax to stabilize them and make it easier to ship them without damaging them. The wax is quite a pain to remove though. If you can, find cells for sale that aren't dipped in wax. Keep in mind though that they may suffer some more damage in shipping. Notice that these cells have metal tabs on them. You want cells with tabs on them. You are already going to have to do a lot of soldering to build a panel from tabbed solar cells. If you buy cells without tabs, it will at least double the amount of soldering you have to do. So pay extra for tabbed cells.
I also bought a couple of lots of cells that weren't dipped in wax from another Ebay
There are lots of other sizes of solar cells besides 3 X 6 inches available. You could use larger or smaller cells for your panel. Just keep a few things in mind.
- Cells of the same type all produce the same voltage no matter what size they are. So the same number of cells is always needed.
- Larger cells produce more current (Amps) and smaller cells produce less current.
- The total power your panel can produce is determined by Amps X Volts.
The cells I settled on are 3 X 6 inches in size and are rated at roughly 3 amps. I will wire 36 of them in series to get a little over 18 volts. The result should be a panel capable of delivering almost 60 Watts of power in bright sunlight. It doesn't sound like a lot, but it sure beats no power at all, which is what I had on my property before. And that is 60 Watts all day when the sun is shining. That power will go into charging batteries which will primarily be used for powering lights and small appliances for only a few hours after dark. Once I go to bed, my power requirements drop to almost nothing. So 60 Watts is actually quite a lot of useful power but adding 6-10 home made solar pannel u will be self sufficient in power requirement, especially when I also have my wind turbine adding to the power production when the wind is blowing.
After you buy your solar cells, put them away in a safe place where they won't get dropped, played with by the kids, or eaten by the dog until you are ready to install them in the panel. These cells are very fragile. Rough treatment and excessive handling will turn your expensive solar cells into little, blue, shiny shards that aren't useful for anything.

Here is a close-up showing one half of the main panel. This well will hold one 18 cell sub-panel. Notice the little holes drilled in the edges of the well. This will be the bottom of the panel (it is upside down in the photo, sorry). These are vent holes to keep the air pressure inside the panel equalized with the outside, and to let moisture escape. These holes must be on the bottom of the panel or rain and dew will run inside. There must also be vent holes in the center divider between the two sub panels.
Next I cut two pieces of masonite peg-board to fit inside the wells. These pieces of peg-board will be the substrates that each sub-panel will be built on. They were cut to be a loose fit in the wells. You don't have to use peg-board for this. I just happened to have some on hand. Just about any thin, rigid and non-conducting material should work.


Now that I had the structure of the panel finished, it was time to get the solar cells ready
As I said above, getting the wax off the cells is a real pain. After some trial and error, I came up with a way that works fairly
well. Still, I would recommend buying from someone who doesn't dip their cells in wax. The first step is a bath in hot water to
melt the wax and separate the cells from each other. Don't let the water boil or the bubbles will jostle the cells against each
other violently. Also, boiling water may be hot enough to loosen the electrical connections on the cells. I also recommend
putting the brick of cells in the water cold, and then slowly heating it up to just below boiling temperature to avoid harsh
thermal shocks to the cells. Plastic tongs and spatulas come in handy for teasing the cells apart once the wax melts. Try not
to pull too hard on the metal tabs or they may rip off. I found that out the hard way while trying to separate the cells. Good
thing I bought extras.
This photo shows the complete setup I used.
My girlfriend asked what I was cooking. Imagine her surprise when I
said solar cells.
The initial hot water bath for melting the wax is in the right-rear. On
the left-front is a bath of hot soapy water. On the
right-front is a bath of hot clean water. All the pots are at just below
boiling temperature. The sequence I used was to melt the
bricks apart in the hot water bath on the right-rear.
I'd tease the cells apart and transfer them one at a time to the soapy
water bath on the left-front to remove any wax on the cell.
Then the
cell would be given a rinse in the hot clean water on the right-front.
The cells would then be set out to dry on a towel. You
should change the water frequently in the soapy and rinse water baths.
Don't pour the water down the sink though, because the
wax will solidify in your drains and clog them up. Dump the water
outside. This process removed almost all the wax from
the cells. There is still a very light film on some of the cells, but it
doesn't seem to interfere with soldering or the working
of the cells. A solvent bath would probably remove the rest of the wax,
but that would be dangerous and stinky since the only
solvents I could think of that would cut wax are either flamable, toxic
or smelly, or all three.
Here are some separated
and cleaned solar cells drying on a towel. Once separated from their
wax stabilized brick form, they are
amazingly fragile and difficult to handle and store. I would recommend
leaving them as bricks until you are ready to install them
in your panel. That way you won't wreck them before you get to use them.
So build the panel first. Now it's time to start installing
them in the panel
Soldering the cells together was tricky at first, but I got the hang of it fairly quickly. Start out with just two cells upside-down. Lay the solder tabs of one cell across the solder points on the back of the other cell. I made sure the spacing between the cells matched the grid pattern. A lot of people write me confused about how to solder the solar cells together. When a hundred people all ask the same question, it's obvious I am not being clear in this area. A lot of people look at the photos and assume I am soldering the cells in parallel instead of in series. I have created this crude sketch to hopefully clear things up. This is a side view of the solar cells soldered together. The negative tabs from the top of one cell are soldered to the positive pads on the bottom of the next. This connects the cells in series, and adds their voltages. I do this until I have a string of 6 cells. 3 strings of 6 make a half panel. I hope that helps. The three strings of cells need to be wired in series. So the middle string needs to be rotated 180 degrees with respect to the other two. I got the strings oriented the way I wanted them (still upside-down) on top of the pegboard panel before the next step of gluing the cells in place. Don't use too much glue, and don't glue the cells anywhere but at their centers. The cells and the panel they are mounted on will expand, contract, flex and warp with changes in temperature and humidity. If you glue the cells too tightly to the substrate, they will crack in time. gluing them at only one point in the center allows the cells to float freely on top of the substrate. Both can expand and flex more or less independently, and the delicate solar cells won't crack. Here is one half panel, finally finished. Once I had two half panels complete, I could install them in their places in the main panel frame and wire them together. My original plan was to mount the diode inline with the positive wire outside the panel. After looking at the spec-sheet for the diode though, I decided to mount it inside since the forward voltage drop gets lower as the temperature rises. It will be warmer inside the panel and the diode will work more efficiently. More silicone caulk was used to anchor the diode and wires. It is important to let all the silicone caulk cure well before screwing the plexiglass covers in place. I have found through past experience that the fumes from the caulk may leave a film on the inside of the plexiglass and the cells if it isn't allowed to thoroughly cure in the open air before screwing on the cover. I've been getting a lot of emails from people giving me grief for using a male plug on the solar panel. They say that power sources should always have female pugs on them to prevent short circuits. I understand their point. However, the reason I used the male plug on the solar panel is because there is a much greater danger of a short circuit on the cable going to the charge controller and battery bank. The solar panel can only supply 3 Amps to a short circuit at most. The battery bank though could pump hundreds or possibly thousands of Amps through a short circuit. That is enough energy to do serious damage. So I put the female end on the cable to the charge controller. Still, I agree that it is dangerous to have a male plug on the solar panel. On a recent trip to Radio Shack I found this sort of plug. It only cost a few bucks and will solve the potential short circuit problem. When unplugged, neither end can short out. So how much did all this cost to build? Well, I saved all the receipts for everything I bought related to this project. Also, my workshop is well stocked with all sorts of building supplies and hardware. I also have a lot of useful scrap pieces of wood, wire and all sorts of miscellaneous stuff (some would say junk) lying around the shop. So I had a lot of stuff on hand already. Your mileage may vary.
The markrt value of the solar panel is 13,000 in indian market. That's a fraction of what a commercially made solar panel with a comparable power output would cost, and it was easy. I already have plans to build more panels to add to the capacity of my system. I'll post more here as the project evolves. Stay tuned |