Renewable energy sources are an alternative to conventional energy development and the most promising field of industry today. Any investment in this economic sector is encouraged by the governments of all developed countries. Government incentives are given to big companies as well as individuals, who provide their homes with energy by means of alternative energy sources. The main principle of using renewable energy consists in its extracting from constant natural processes, which take place in our environment. These processes include sunlight, wind, rain, tidal waves and geothermal energy. Perhaps, the most well-known source among the mentioned above is solar energy.
Solar energy is a branch of alternative energy based on direct usage of solar radiation for getting various kinds of energy. Solar energy uses the renewable energy source and is absolutely green. There are two main kinds of energy which can be extracted from solar radiation: heat and electricity. To convert solar energy into electricity PV solar panels are used. Solar panels are widespread in many countries and cities nowadays and used not only at solar power plants, but for everyday necessities as well. For example, such panels can be installed on the rooftops of houses to provide buildings with electricity and heat. People, who live in remote areas, also use solar panels and wind turbines to provide themselves with energy, which is not available there from other sources. Moreover, governments of such counties as Australia, USA, Canada, Great Britain and many others offer various incentives, tax rebates and grants for those, who use green energy and supply themselves with it.
But is it possible to make a solar panel by yourself? It is! You may do different kinds of panels from the smallest ones for making your radio play to big ones for providing your home with electricity (of course, if your latitude makes it possible). Let’s look through how solar panels are made in general and how you can make it yourself.
Schemes of Connection
A photovoltaic module or solar panel is the main component of any photoelectric system intended for electric energy production. A solar panel consists of several photovoltaic elements connected with each other. Two ways of connection are used either for gaining voltage or current: the series connection and parallel connection. But there is also a mixed type of connection for gaining both voltage and current. The series connection implies connecting of positive terminals of one module to negative terminals of the other. In this case, we have the voltage of two or more panels between the terminals, but the current is the same as in one panel. So, if we connect two panels of 12 V and 4.5 A, the output voltage is 24 V and 4.5 A. Connecting 4 such panels we get 48 V and 4.5 A and so on.
Parallel connection means that positive and negative terminals of the panels are connected according to their polarity. As a result we have a sum of current strength of all panels and voltage remains invariable. So, 2 panels with 12 V and 4.5 A gives output of 12 V and 9 A, 4 panels give 12 V and 18 A etc.
Series-parallel connection is used for getting high values of output current and voltage. Besides, one group of 4 modules can be connected to another by means of parallel connection, thus creating a system of high capacity.
But let us also consider manual system of making solar panels. We already know that a solar panel is a container consisting photovoltaic (PV) elements. PV elements are those things which convert solar energy into electricity. Unfortunately, you need a lot of those things to get enough electricity for your needs. Moreover, these elements are very fragile. So, this is one of the reasons for uniting them in solar panels. A battery has a sufficient number of elements to produce high power and protects PV elements from damage.
If you look for the PV element, you see that new elements are very expensive and not as widespread as used ones. But it’s ok, because you can do a solar panel from used PV elements as well. It is reasonable to look for them at eBay.
First of all, you need to find and buy a few sets of single-crystal PV elements. The size can be various. You should only remember that you need only similar elements for making a panel. Let’s take the size of 3×6 inches. To make a solar panel you need to connect in parallel 36 elements of this size. Each element generates about 0.5 V, so 36 elements give us the output of 18 V. This is enough for charging 12 V batteries. Remember that PV elements of this kind are very fragile and can be easily damaged. You should also know how to work with soldering iron, because you will have to connect elements with its help.
At first we need to make a shallow box with low borders, which will not shade our PV elements. You may use veneer with thickness of 3-8 inches; sides should have about 3-4 inches of thickness. It will contain 36 elements. You may also divide it into 2 parts (18 and 18) for you to have fewer troubles with soldering. You need also to make holes at the bottom part of your panel to equalize air pressure within it. These holes should be only at the bottom, otherwise rain or dew will penetrate into the panel.
The exterior part should be covered with plexiglass to protect elements. It is more effective than usual glass in this case. Then you need to paint the boxes to protect wood from moisture, which will have negative effect on your elements in its turn. After that you should draw a scheme for placements of your elements. It should be something like a grid. Place the elements on it upside down to solder them in parallel. You remember that we have to parts with 18 elements in both. The parts should be also connected in parallel.
Then we need to glue elements to the base. You should add a little of silicone glue to the center of an element and then slightly press them down. Be careful with that, because you may damage the elements.
Make holes in the bottom of your panel to take the wires out. Bind a two-contact plug to this wire. It will make possible the connection with accumulator. After that you may install your battery anywhere you like and accumulate electricity with its help.
Certainly, this is a basic guide of how to make solar panels. The panel of such type can be used only for accumulation energy for small appliances. If you would like to provide the entire house with electricity, you need to turn to professional companies. This is rather costly, but profitable in future.