The Photovoltaic cells which are known as PV in short form are the devices which convert sunlight into power, this eliminates totally use of mechanical generators and thermodynamic cycles.

The full definition of Photovoltaic is in the name itself; photo means light and voltaic means electricity. Due to the advancement in the technology the prices of solar panels have been dropping every year as compared to the prices a decade ago.

The prices still are very high that is the reason why most of the household are not shifting to solar power; the prices could be more due to the technology which has become superior over the years. In the past, electricity produced was not that high but with the modern technology and use of photovoltaic cells, now more watts are generated.

The prices can further reduce with advanced technology, mass production and also making it more popular with the general masses. Even if you get partial supply of the solar power, you can still save lot of money on the energy bills and run most of the appliances on solar power.

The price of photovoltaic cells mainly depends upon the quality, age and technology. Wind turbines have been there for hundreds of years, but the technology in the solar cells has improved greatly. In some case the entire energy demands can be met with solar power alone.

There are instances where people are producing surplus power and earning money. Both solar and wind power is the answer to the growing demands of the energy in coming years.

Presently silicon based solar cells are available which are quite efficient in providing neat, fresh and clean energy using sunlight. Silicon costs $75 to $80 per kilo that too for long term contracts, it is a material of choice for the electronic industry, because it is not toxic and is very efficient.

But the prices are still very high. The organic semiconductors which are carbon based have become quite promising, it is due to the lightweight and flexible solar cells that may eventually become quite cost effective to generate since they may be printed on the large sheet which are cheap and that too at room temperature.

The most expensive of all types could be the Monocrystalline silicon, such material is very effective. The polycrystalline silicon though is very cost effective but its efficacy is not that good.

Photovoltaic solar cells are very effective in generating electricity using sunlight. The economic meltdown might have affected this technology also, but it is still the most acceptable source of energy which does not affect the environment and the source of solar energy is unending. It might be costly investment in the beginning but one is assured to recover the cost in few years.

The best part is that not only you can store energy and use it in the evenings and nights, but whatever surplus you produce can be an extra income for you. You have option to sell extra power to the utility companies and get rebate in your energy bills. There are many subsidies and incentives given by the government also.

A solar panel is a set of interconnected construction of solar cells, also called Photovoltaic (PV) cells. The solar panel can be utilized as a constituent of a larger photovoltaic system to generate and distribute electricity for commercial and residential applications.

This post is a brief introduction to Do It Yourself (DIY) solar panel construction, which involves soldering of solar cells together. Although most people are already aware, it is better to know that solar cells are, basically, two types: “tabbed” and “un-tabbed”.

Even though tabbed cells are somewhat costlier, overall, it will work out much cheaper, if one intends to construct more than one solar panel. Besides use of tabbed cells will save a lot of time, the number of broken cells will be much less and because of this, there will not be any scope for irritations.

Solar cells are very delicate and the chances of breakages would be higher if they are handled more frequently or also not handled carefully. As solar cells are very brittle, soldering calls for careful handling and un-tabbed solar cells not only require soldering across a cell but also involves twice the amount of work than that of tabbed cells and the breakage of cells is likely to be much more in respect of un-tabbed cells.

Tabbed solar cells are provided with the metal connector strips connected to the front portion of “sunny side face” of the solar cells. This strip has a free end sufficiently long to position it across the subsequent cell.

These tabbed cell strips will link the front of one cell to the contact point on the subsequent cell and the process is repeated till all the solar cells are interconnected. While the front side of most of the solar cells is negative, the back portion is positive thereby, enabling the electric current to pass through between the cells in the solar panel. As mentioned earlier, the tabbed solar cells are preferred because considerable effort has to be put in to solder un-tabbed solar cells.

The first step in the construction of a solar panel is essentially to solder a new metal strip to the front of each cell before even thinking of interconnecting the solar cells. As the solar cells are delicate, it involves a lot of time to do the difficult job of soldering each cell, especially if these are un-tabbed cells. It is, therefore, advisable to purchase only tabbed solar cells for paneling.

Another important aspect in the construction of a solar panel is to choose a superior quality 65 to 75 watt regulating type soldering iron, which should be set to a temperature of around 700°F. The temperature control is very essential.

If the soldering iron is very cold, solder will not function properly and if it is too hot, the cells are likely to get damaged. However, if someone has purchased un-tabbed cells, one should, as a first step solder a tabbing strip to the “sunny-face” of each of the cells.

There are two methods of doing it; both are, of course, very tricky and difficult. One can either solder the strip directly to the cell using flux, pre-solder or “tin” each strip before soldering it to the cell. The main reason for adopting one of the two methods is to ensure a “solid connection” to the solar cell or otherwise, electric current will not pass through the cells.

Solar tabbing ribbon, normally, comprises 10 to 15 micrometers of solder alloy with 60% tin and 40% lead, known as SN60, coated on a copper strip. As the alloy contains lead, pre-soldering the tabbing strip is a cumbersome process and some people will, therefore, avoid this step.

Flux should be applied either way to the large glittery strips (the “bus bars”) on the front of “sunny face” of the solar cell. The next step is to place the tabbing strip along the fluxed bus bar and with a flat soldering iron, move gradually down the strip. This is a very delicate job. If it is not done properly, the tab strip will come off.

If it is done carefully; the tabbing strip will firmly connect to the bus bar. For this work, the help of an additional hand would be highly desirable. Sometimes, it may be better to practice on a broken cell using an extra strip in order to get an idea of the work involved in soldering.

As there are normally two of these strips on each solar cell, soldering is always a tricky and difficult job. From this, one can easily understand why it is highly desirable to purchase tabbed cells.

DIY Photovoltaic Panel Construction Guide

Do you want to learn how to build your own DIY solar panel at home with a budget of less than $200? If you do, check out the Green DIY Energy program. The program comes with step with step instruction and High Definition (HD) videos on making your own PV panels from scratch. Click on the link below to visit the web site right now.

==> Click here to visit Green DIY Energy now!

This is a general introduction to the steps needed to tab and solder solar cells together. Also a brief definition as well as the distinct difference between un-tabbed and tabbed solar cells.

You may know that currently there are both tabbed and un-tabbed solar cells on the market. The tabbed solar cells are more expensive, however if you intend to build more than one solar panel, they will save you time, broken solar cells and future frustration.

Solar cells are quite fragile as a general rule, the more you handle or mishandle them, the greater the chances are of breaking them. The un-tabbed solar cells must be soldered, doing this to any solar cell requires great skill and care.

The soldering iron should be of a good quality with a 65 to 75 Watt adjustable unit with the temperature set at about 700F. You must find the temperature that is perfect for your specific solder.

If you run the soldering iron too cold, the solder will not run properly, too hot and you risk damaging the solar cells. Doing this to un-tabbed solar cells effectively means soldering right across a solar cell, having to solder a new metal tab strip to the front of each solar cell before you can even start to connect your solar cells together.

You can solder the strip directly to the solar cell with flux or, pre-solder or “tin” each strip and then solder it to the solar cell. The goal is to get a solid solder connection to the solar cell or it will not transfer current.

Solar tabbing ribbon typically consists of 10 -15 micrometers of solder alloy, commonly SN60 (60% tin and 40% lead) coated on copper strip, note this contains lead.

Apply flux to the big shiny strips (the bus bars) on the front “sunny-face” of the solar cell. Lay the tabbing strip along the fluxed bus bar and with a flat tipped soldering iron, run slowly down the strip. If done with skill and extreme care, the tabbing strip will bond to the bus bar.

I highly suggest you practice on a broken solar cell with some spare strip to get a feel for the soldering. There are usually two of these on each solar cell. This makes twice the work with the chance that you will break some of the solar cells.

Tabbed solar cells come with the metal connecting strips already attached to the front face side of the solar cells, this strip is long enough to lay across the next following solar cell. The tab strips will connect the front of one solar cell to the contact points on the back of the next.

In general, the solar cells are negative on the front and positive on the back which allow the electricity current to flow between the solar cells in your solar panel. Tabbed solar cells are in my opinion the safe option if you want efficiently installed solar cells that do the job you need them to do.