At first glance, building your own solar panel does not seem like a DIY project, but reality is much simpler than many other DIY projects. Solar cells are the tricky part of a solar panel and can be bought quite cheaply. Once you have solar cells, you basically have to weld together place them in a frame, and wire to the terminals. The good news is that you can build a solar panel for about $ 1 per watt, while the purchase prices of a group completed run $ 2 1 / 2 to $ 3 for their savings in a system of 3,600 watts for amounts of $ 5,000 to $ 7,000.
The purchase of solar cells.
Polycrystalline solar cells are available to consumers is of small quantities of a number of suppliers on the Internet. Probably the best source is eBay, because there are many vendors, pricing is very competitive, and Ebay has a rating system to know that your degree is a trusted supplier. The size is the most common is 80 mm by 150 mm or 3 1 / 4 "x6" that the output of 0.5 volts, 3.5 amps or 1.75 watts. They are available with tabs or untabbed. The version of tabs is used here to connect the cells together and welded to the cell so that they are much easier to work. I suggest use version tabbed at least during the first panel.
You are also altered cells, with minor aesthetic issues and dead cells are available for less money. The altered cells well, only have an irregular appearance of the panel, so it will work, but the cells broken, it will be very difficult to weld together and will not produce consistent power so would leave the fans. Also, make sure that your shipments are insured because the cells are very fragile and do not want to pay for dead cells.
The construction of the solar panels of its framework.
The first consideration is the size of its panel, which will be determined by the number of solar cells used in each panel. Recalls that in its planning you want to do all the panels the same size with the same electrical output. For example, using 36ea 3 "x6" solar cells arranged in a matrix of 4 x 9, you can build a panel that would have 65 watts output and measuring 55cm x 70cm (25 "x 32"). The least expensive panel can be done with a wooden support and a framework wood. This should be painted with an exterior primer and several coats of UV resistant paint to last. If you want a longer panel life, you could use Anodized aluminum framework.
Welding solar cells together.
Assuming you are working with cells eyelashes and using the matrix of 4 x 9 mentioned above, you will have to make 4 strings of 9 cells each. Each cell has two tabs welded to the back or negative Cell. These tabs will be sufficient to reach up through the rear of the adjacent cell and must be soldered to each of the contacts in the adjacent cell. Be sure to leave about 1 cm or 1 / 2 inch between cells, and is a good idea to crimp the tab in this gap before welding to have a low capacity maneuvering for expansion and contraction due to bad weather and imperfect measurement. Continue welding cells in this manner until you have completed your chain of 9 cells. Finally, it is necessary for soldering chips to contact the first cell negative for driving on both ends of the chain. Test each channel in the sun with its multimeter to make sure your connections are working and you are getting at least 4.5 volts and 3.5 amps ..
Final assembly of your solar panel.
Contrary to the four strings on the panel who made sure it fits evenly and cells are not touching. Be sure to turn the rope so the positive carried out since the end of a chain is carried by the affirmative the following string. If everything looks good, attach to each cell of the panel with some silicone caulk. Then we have to solder the wire with copper wire or tape form. Connect the positive leads to negative wires from the panel next to all the chains are connected in series. Finally, solder a wire of 25 cm or 12 inches for the negative cable on one end panel and a cable to the positive cable at the other end of the panel to create the cables used to connect panels together. Try again to make sure you are getting the output of 18 volts and 3.5 amps. After waiting several days for the silicon to dry, you must cover the cells with a tempered glass cover or plexiglass, Seal the edges with silicone and that's it.
DIY Solar panel: Part 1
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