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Solar Cells
Checkout Ebay Auctions For The Cheapest Prices
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 20pcs A Grade 125x125 Monocrystalline Solar Cells 2.8 Watt Mono 5x5 solar panel  US $46.99
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 72 pcs 3"x6" 1.8W solar cells for solar panel US $58.00
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American Educational 4735 Solar Cell List Price: $14.70 Sale Price: $14.70  |
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This Solar Cell can be used independently to create 0.45 Volt to 100 milliampere or with other solar cells to product greater voltage. For grades 4 to 12 and ages 9 to 18 years. |
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American Educational 7-1849 Solar Cell and Motor Demonstration, 5" Length x 5" Width x 4" Height List Price: $48.95 Sale Price: $36.98 |
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High-power silicon cell converts light directly into electricity to operate a motor. Exceptionally high output 1/2v with 300 milliamps of current output in bright sunlight. Solar cell approximately 2" x 3" with plastic diffusing lens and protective mounting. Motor with special anti-friction bearings revolves approximately 400 RPM in bright sunlight. Instructions included. Measures 5" length by 5" width by 4" height. |
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American Educational 7-1849-2 Demonstration Solar Cells List Price: $30.30 Sale Price: $25.08 |
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This is a great desktop item and attention-getter. Four powerful solar cells are mounted on a revolving disk and motor. This in turn is mounted to a plastic stand and base. Watch as the entire disk, solar cells included, begin to whirl around when the unit is placed in the sun. Instructions provided. |
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Solar Cell Sale Price: $11.50 |
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Solar Cell - A clear acrylic case with molded-in lenses holds this silicon solar wafer. The cell is color-coded and comes complete with wire leads (10 cm). Output in full sunlight is up to 400 m Å at 0.45 VDC. -- Size: 7.6cm L x 4.4cm W. |
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Neiko Solar-Powered Auto Darkening MIG/TIG Welding Helmet, ANSI Approved Lens List Price: $129.00 Sale Price: $46.89 |
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The shield lens darkens instantly when welding begins and clears when wielding stops. Switch easily between shades from 9 to 13 with 1/10000 second reaction time. The internal rechargeable lithium battery is rechargeable by the solar cell. Two-way adjustable headband ensures a comfortable fit. The helmet meets ANSI Z87.1 standards. |
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Battery Indicator - Solar Panel or Golf Cart 12/24 volt Sale Price: $33.99 |
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Battery Status The battery meter has 10 LEDS that will light to show the battery condition. When fully charged, only the 10th LED will light shown a green LED. As the battery discharges, successively lower LEDs will light; the 9th, 8th, 7th and so on lighting only 1 LED. At approximately 30% battery life, the #3 LED will light and the color is Yellow as a caution indicator. At approximately 20% battery life remaining, the #2 LED will light as a Flashing Yellow. When the battery discharges to approximately ~10% remaining life, the #1 LED will start FLASHING RED with the #2 LED FLASHING Yellow alternately. |
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Nasco - Mini Panels Encapsulated Solar Cell - 1V Sale Price: $11.95 |
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Combines advanced digital optics and bright white LED lighting in a small precision portable microscope that fits in the palm of your hand. 40X-140X magnification lets you zoom in on the fine details of stamps, coins, fine engraving, fingerprints, security holograms, insects, and plant disease symptoms. Comfortably view the image from the microscope right on your computer monitor instead of straining to look into a tiny eyepiece. Capture images, easily add labels, take measurements, and even draw right on the live image. Comes with all of the software required to capture, annotate, archive, and even measure your still images. Capture live videos and time lapse sequences. Connects to a USB port. SYSTEM REQUIREMENTS: Windows 2000/XP/Vista, Pentium III 500 MHz or greater, Internet Explorer, 5.0 or greater. One-year warranty. |
Here are some more information for Solar Cells:
When it comes to selecting solar cells for your do-it-yourself projects, one question many have is does solar cell efficiency matter? Answering that is actually quite simple.
The answer is yes, solar cell efficiency does matter. The important thing to note here is that it may not be for the same reasons you would think. It isn't choosing the most efficient cells that matters the most, it's balancing cost versus efficiency that will make all of the difference to the final price of your residential solar energy system.
Without getting into the different grades of solar cells, or talking about how you can save money by choosing grade B cells, let's discuss how to correctly balance these two aspects of building a solar panel (or a number of them).
Solar Cell Efficiency in a Nutshell.
When it comes to choosing the right solar cells, my suggestion is always to stick with your standard polycrystalline cell. These types of cells are readily available on the do-it-yourself markets, and as far as efficiency is concerned most are rated at 16% - 20% efficiency. To translate that into a number that is more usable. A single 3" x 6" (80 mm by 150 mm) will produce 1.6 Watts to 2.0 Watts of power.
These are the best cells to use when building solar panels for one simple reason - cost. Your standard polycrystalline cell can be found for as little as $1.50 each (even less if you choose grade B cells) and they usually average around $1.80 on sites like eBay. Using this type of cell you can build a complete 100 Watt panel with about $85 worth of cells.
Where some confusion is beginning to appear is with the availability of 30% to 35% efficient solar cells. Although these aren't yet as common on the do-it-yourself markets, they are becoming available and some people are looking to increase the efficiency of their residential solar power system using these cells.
The problem isn't that high-efficiency monocrystalline, or thin-film, cells don't work. You can just as easily build a solar panel using this technology as you could with the older standard cells. The problem is the cost. With the new 30% efficient cells costing as much as five times more than a standard cell, they simply aren't worth it. You pay five times more for only a 10% gain in power production.
If you had determined that you needed 10, 100Watt, solar panels to run your home, with the standard cells you could feasibly expect to build your panels with about $850 worth of cells. To build the same system in the with high-efficiency cells you'd still need 9 panels, and the cost of the cells would suddenly increase to about $3825.
So to answer our original question, yes solar cell efficiency matters. but not for the reason you probably thought; it's balancing cost versus efficiency that will really make the difference when you convert your home to solar energy.
John O'ryan works as a builder/installer of Green Energy solutions. He also runs a site that helps others choose the right solutions to go green and save. You can read about the top 3 guides to go green and save on his site http://www.diysolarpanelguides.com.
Landmark Efficiency Gain For Solar Cell Technology
Tracking advances in solar cell technology, I’ve stumbled across another landmark efficiency gain.
This one, obtained by switching from conventional screen printing to a non-contact aerosol jet printer, has upped efficiencies by 2 percent on thin-film solar cells.
Thin-film solar cells (TFSC) are defined as solar cells made by depositing one or more thin layers (nanometers to micrometers) of photovoltaic material on a substrate. These thin-film cells are classed as: amorphous silicon, cadmium telluride, copper indium gallium selenide (CIGS), polysilicon, dye-sensitized solar cells, or organic (plastic, or polymer) solar cells – the latter three still in development stages.
Printing is a deposition method, and the use of aerosol jet printing could raise the copper indium gallium selenide efficiency – already reported at 9.5 percent (with reports from NREL in excess of 19 percent) – to a value competitive with silicone-based solar at about half the cost to manufacture.
The advance, coming from the Fraunhofer Institute’s Solar Energy Systems in Germany, reports that using an Optomec printer enabled thinner strata deposition of metallic, semiconducting and insulating inks via nanoscale pigments developed by Applied Nanotech Inc. enabled efficiences in excess of 20 percent, as compared to previous figures of 16 to 18 percent.
Fraunhofer also used the printer to fabricate front-side metallization lines on otherwise conventional solar cells, which enabled it to shrink the metallization area and boost efficiency by reducing shading losses.
Screen-printed solar cells can be manufactured faster than ink-jet printing methods, and the Optomec’s 40-nozzle head can print a solar cell in under 3 seconds. What this means to you, the consumer, is a future of truly affordable solar. What it means to the environment is of inestimable value.
Of course, waiting to save a few bucks doesn’t make a lot of sense in terms of the environment. News coming out of the United Nations Climate Change Conference in Poznan, Poland (December 5 to 12) indicates that climate change is not only upon us, but likely to reach that critical "tipping point" in as little as a decade.
About the Author
Cooler Planet is a leading solar resource for connecting consumers and commercial entities with local solar Installers. Cooler Planet's solar energy resource page contains articles and tools such as our solar calculator to help with your solar project.
If a typical home uses 390 kWh of electricity per month, how many square meters of solar cells would be requir?
In a sunny location, sunlight has a power density of about 1 kW/m2. Photovoltaic solar cells can convert this power into electricity with 15% efficiency.
If a typical home uses 390 kWh of electricity per month, how many square meters of solar cells would be required to meet its energy requirements? Assume that electricity can be generated from the sunlight for 8 hours per day.
Michelle, John is quite correct in his math. The only problem with the problem as it's stated is that the average solar panel is closer to 11% efficient. There are some leading edge ones that claim to have reached as high as 18%, I don't know if they have been independently tested yet, but most run between 10 and 13 %. So about 11 square meters should do it based on your weather forecast.
We actually live in a solar powered home. Our panels are advertised at 12% efficiency, they are multicrystaline. Our entire array takes up 155 square feet, or about 15 square meters. Our home uses about 300 kwh per month, and in the summer, we usually have a little excess, meaning by 2 pm on sunny days, our batteries are full and can't hold any more charge, so for an hour or two, the panels only power the small loads in the house, and the rest is wasted. This is necessary though, so that after a few cloudy days, when the sun comes out, there is extra to bring the batteries back up as well as run the home.
Are you working on a homework assignment, or just doing research? There are some better places to get info on this subject than asking hacks like me online. Solar Energy International would be my first pick, and some of the renewable energy associations too. I will put some names and links below for you. Also, there is a great periodical that covers this stuff right down to the nuts and bolts, Home Power Magazine. It is actually where we got started 11 years ago, now we have made it here. Check out some of the websites and do some of your own research, you'll be well informed in the end. Good luck, and take care, Rudydoo
Firms explore electroless plating for solar cells
The College of Nanoscale Science and Engineering (CNSE) of the University at Albany, N.Y. and Technic Inc. have announced an R&D partnership that is designed to enable critical improvements in manufacturing processes for solar cells.
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