homemade solar panels. On one site I found. an article about how a craftsman has made this product in the home. Here is what he writes about his exploits:.
' I also made a homemade. solar battery. , Which is shown below:.
As you can see, it consists of two sections of approximately 14 * 11 cm. In each section of 12. solar Cells. size 31 * 31 mm with a voltage of 0.47 V and 0.29 A current strength. Solder thin wire elements, which took some of the live wire. Handles soldering soldering acid. Solder rosin just unreal. But acid can easily cope with this case. Then the processed items with alcohol to remove any residual acid. (. It is easier and safer to solder flux neutral type LTI -120. Note. ed. ).
I arranged the elements of one-sided PCB foil, which has previously scraped with a chisel all the copper coating. Stuck to the usual elements of glue ' moment ' to this PCB into small droplets in the center of. Then add a little epoxy bumpers of the above elements, and above all filled in a transparent silicone sealant. This eliminated the need to protect the elements of organic glass. From experience, it became clear that although the surface of the sealant is uneven, but the losses were not greater than 2 - 3%.
In the nest I added a Schottky diode 3 A - which was close at hand. Measurements performed on a bright sunny day, there are two panels at right angles to the sun. Without the diode: open circuit voltage of 13.8 V, short circuit current 0.28 A. With the diode: the open circuit voltage 13.3 V, short circuit current 0.25 A. It is seen that the diode really are lost, but it's better than when the battery current will flow back into the battery.
The theoretical capacity of solar cells was 3.2 W, but the actual was around 2.4 W. What, in principle, sufficient to charge the batteries to the eyeballs with a sunny day. (. Not quite right, t. to. maximum power will be working at solar. In this case, Uxx = 13. Urab 8V = 10V, and Isc = 0. 25A Irab = 0. 2A, which ultimately yields about 10 * 0. 2 = 2W, which are actually received. Note. ed. ).
I tried to charge the battery 6 'Space' AA 2700 mA. They are shown below:.
To do this, tested at the beginning of the stabilizer. By the way, the stabilizer of a slightly modernized for convenience. Namely, changed denominations SMD resistors, and received other voltages: 4.16 V ( powered LED flashlight ) 5.05 V ( charge e. Books and Communicator ) 6.2 V (charge 4 AA batteries for the camera ) and an adjustable. Then drilled a hole for adjusting the voltage and fixed shawl epoxy. Another crocodile clips replaced the plug and socket, again, for convenience. All of this is shown below:.
Put the output voltage of 9.6 V - with a margin for charging AA batteries 6. Input voltage is set to 11 jumper in. It's all connected to the solar battery. Current charging was 0.15 A. enough to be. Connect the battery directly to the battery. Received by the charging current 0.25 A - what you need. (. In this case, the stabilizer is useless, t. to. 6AA batteries voltage approximately equal to the working point of the solar cell, m. e. and so they are optimally matched. The stabilizer is, firstly, introduces extra losses ( efficiency), and, secondly, the installation of the ban ' drawdown ' the input voltage drops below 11V leads to the fact that he was removed from the operating point and the battery did not give the whole power. Note. ed. ).
Only when it is necessary to periodically monitor that the voltage has not risen above 9.2 V on the battery. (. By the way, and that control at such low currents? . to. currents below the safe and recharge the batteries even when not damaged. Note. ed. ) For this I used a compact voltmeter. I also upgraded it and added two plugs - one for power, the other to measure. He is depicted in the figure:.
Yet come to the conclusion that the stabilizer is better suited for high-power solar panels. And with this, as I have done better to charge the batteries directly, and the stabilizer used in the charging device, and other electronics from the buffer battery. Here, it will just irreplaceable. '.
Dmitry nondividing 05. 09. 2009.
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