12 Everbright Solar Cell string ribbon multicrystalline untabbed Cell
Product Details
Item# 020-01101-12
Regular price: $38.89
Sale price: $32.28
Product Description
You can buy this solar cell individually. Usually we prepackage them in to 36, 50, 72, 108, 150, 200 pieces and sell them as a bundle. But this one you can order any number of cells you want. The unit price is higher because people usually buy a few as samples to find out how well they perform and how they look. We are the largest Evergreen Solar cells seller in the world, so we are very confident in the solar cells that we sell.
This batch of Evergreen solar cells came from Evergreen's newest factory in Devens, MA directly to our warehouse in Silicon Valley just a few weeks ago. This set of new 3"x6" solar cells are string ribbon multi crystalline cells made by Evergreen Solar, the all American solar company that has the smallest carbon foot print - they waste the least silicon in making these cells.These newest cells have a little different look from the other cells are still being made in the largest quantity in Evergreen solar's German factory (The German factory uses all American technologies and equipments, and it's adding another new production line going live this year). The front of the solar cells looks similar to the traditional multicrystalline solar cells in that they show the borders and shapes of irregular crystal formation. In terms of output they may be slightly better, but in any volume production you are going to have cells with varying levels of power output. The cells are the original factory standard cell size, not other sizes cut by using home made tools which could damage the cells during cutting process. The cells have never been used or soldered, and are not recycled from badly made panels like some factory installed tabbed cells are. There are no tabs on these cells so you can start from scratch and get experience in making solar panels. In our listings, if we don't describe them as 'chipped', then they are considered to be our category A cells, although very tiny defects or blemishes could exist but they don't affect power output. Our sorting team tries to do as good as a job possible to categorize the cells, and we are confident that they are the best cells available on eBay outside of Evergreen solar itself. Almost all of customers have been very happy with the solar cells that we shipped in large volume. If you think the solar cells don't meet your expectations, send them back within 7 days for a complete refund or replacement, because we understand that in large volume order processing, some mistakes do happen and the important thing is that we are willing to rectify them and we need to be given an opportunity to fix rare mistakes when they do happen. From the enormous number of cells that we shipped this past couple of months, returns have been essentially negligible. We will keep rolling out new products and categories at great prices and those who mistreat us will be excluded from our new offers.
The following is a little more details regarding this listing:
I. Cells:
The facgtory standard cell specifications are the following, though the individual cells can be above or below these standards. We do not guarantee that each cell will perform to these standards, however, our customers have been happy with what they get.
Cell Specifications: Average Power (Watts): 1.75 Wp Average Current (Amps): 3.5 Imax Average Voltage (Volts): 0.5 Vmax Thickness 200 = 0.2 mm Exact dimension: 3 1/4 inches x 6 inches, or 80 mm by 150 mm Weight: Just above 6 grams, or 0.2 oz.
II. How to make sense of the above numbers:
The basic and very important formula you need to know to make sense of solar cells is this: Power (P) = Current (I) Multiply by Voltage (V), or P=I*V Power's unit of measure is watt, Current's unit of measure is amp, Voltage's unit of measure is volt.
So in our solar cell's specific example, if each solar cell is rated at 1.75 watts on average, and the voltage is 0.5, you do a little algebraic math, then to get the amps (I), since P=I*V, so I = P / V , therefore I (amps) = 1.75 watts divided by 0.5 volts = 3.5 amps.
It's important to understand the concepts of series connection and parallel connection when stringing these solar cells together to make a solar panel. Series connection of the cells increases voltage but not amperage; parallel connection of the cells increases amperage but not voltage. Series connection is when you connect the positive terminal of a cell with the negative terminal of the next cell. Parallel connection is when you connect the positive terminals of all cells in the set of cells with a tabbing wire and all the negative terminals of all cell in the same set. You can use a combination of series and parallel connections to get the right voltage and amperage for your solar panel.
The cell specifications above were given to us by the manufacturer as averages. Variations are possible. To make a 18 volts panel, for example, you connect 36 cells in series (36 cells times 0.5 volt each = 18 volts). And 36 * 1.75 (each cell in theory averages 1.75 watt) watt = 63 watts. The amps you will be getting is 63 watts divided by 18 volts = 3.5 amps.
III. Solar cells basics:
The front of the cells (blue side, aka Sunny side) has two thick white lines, called bus bars. They are the negative terminals of the cell. The back side, where the 6 square dots are, are positive terminals. Connect the tabbing wires from the bus bar of the first cell on one side to the three dots of on the back side of the next cell. That way you have a series connection. Repeat the process on the other side of the cells. In panel making you should connect all the tabbing wires on the front for all the cells first, then flip the cells over to solder the back side in a second step. Some solar cells such as SunPower cells have both positive and negative terminals at the back of the cells, but we don't have to worry about them. Most cells are negative on the front and positive on the back.
The thick white color lines, called bus bars, on front and the contact points on the back are made out of silver, and you should keep them intact. Apply solder on your them and the wires should bond. Do not use sand paper to send it down. The most you should do is to use a pencil erase to clean the surface of the bus bar or the soldering points at the back of the cells.
IV. Testing:
Make sure that you test the cells under strong sun light with the front of the cell facing the sun, at the same time connect your meters to the right terminals. Since the positive side of the cell is at the back side, you can get a metal plate, ideally copper, and place the solar cell on the plate, with the blue side facing the sun. That way you can place your positive lead from your meter on the plate to access the positive terminal of the solar cell, and place the negative test lead from your meter on the bus bar of the solar cell to get voltage and amperage readings. If you are inside the building, make sure you shine your sun simulating lamps onto the front of the cell while testing.
You can buy this solar cell individually. Usually we prepackage them in to 36, 50, 72, 108, 150, 200 pieces and sell them as a bundle. But this one you can order any number of cells you want. The unit price is higher because people usually buy a few as samples to find out how well they perform and how they look. We are the largest Evergreen Solar cells seller in the world, so we are very confident in the solar cells that we sell.
This batch of Evergreen solar cells came from Evergreen's newest factory in Devens, MA directly to our warehouse in Silicon Valley just a few weeks ago. This set of new 3"x6" solar cells are string ribbon multi crystalline cells made by Evergreen Solar, the all American solar company that has the smallest carbon foot print - they waste the least silicon in making these cells.These newest cells have a little different look from the other cells are still being made in the largest quantity in Evergreen solar's German factory (The German factory uses all American technologies and equipments, and it's adding another new production line going live this year). The front of the solar cells looks similar to the traditional multicrystalline solar cells in that they show the borders and shapes of irregular crystal formation. In terms of output they may be slightly better, but in any volume production you are going to have cells with varying levels of power output. The cells are the original factory standard cell size, not other sizes cut by using home made tools which could damage the cells during cutting process. The cells have never been used or soldered, and are not recycled from badly made panels like some factory installed tabbed cells are. There are no tabs on these cells so you can start from scratch and get experience in making solar panels. In our listings, if we don't describe them as 'chipped', then they are considered to be our category A cells, although very tiny defects or blemishes could exist but they don't affect power output. Our sorting team tries to do as good as a job possible to categorize the cells, and we are confident that they are the best cells available on eBay outside of Evergreen solar itself. Almost all of customers have been very happy with the solar cells that we shipped in large volume. If you think the solar cells don't meet your expectations, send them back within 7 days for a complete refund or replacement, because we understand that in large volume order processing, some mistakes do happen and the important thing is that we are willing to rectify them and we need to be given an opportunity to fix rare mistakes when they do happen. From the enormous number of cells that we shipped this past couple of months, returns have been essentially negligible. We will keep rolling out new products and categories at great prices and those who mistreat us will be excluded from our new offers.
The following is a little more details regarding this listing:
I. Cells:
The facgtory standard cell specifications are the following, though the individual cells can be above or below these standards. We do not guarantee that each cell will perform to these standards, however, our customers have been happy with what they get.
Cell Specifications: Average Power (Watts): 1.75 Wp Average Current (Amps): 3.5 Imax Average Voltage (Volts): 0.5 Vmax Thickness 200 = 0.2 mm Exact dimension: 3 1/4 inches x 6 inches, or 80 mm by 150 mm Weight: Just above 6 grams, or 0.2 oz.
II. How to make sense of the above numbers:
The basic and very important formula you need to know to make sense of solar cells is this: Power (P) = Current (I) Multiply by Voltage (V), or P=I*V Power's unit of measure is watt, Current's unit of measure is amp, Voltage's unit of measure is volt.
So in our solar cell's specific example, if each solar cell is rated at 1.75 watts on average, and the voltage is 0.5, you do a little algebraic math, then to get the amps (I), since P=I*V, so I = P / V , therefore I (amps) = 1.75 watts divided by 0.5 volts = 3.5 amps.
It's important to understand the concepts of series connection and parallel connection when stringing these solar cells together to make a solar panel. Series connection of the cells increases voltage but not amperage; parallel connection of the cells increases amperage but not voltage. Series connection is when you connect the positive terminal of a cell with the negative terminal of the next cell. Parallel connection is when you connect the positive terminals of all cells in the set of cells with a tabbing wire and all the negative terminals of all cell in the same set. You can use a combination of series and parallel connections to get the right voltage and amperage for your solar panel.
The cell specifications above were given to us by the manufacturer as averages. Variations are possible. To make a 18 volts panel, for example, you connect 36 cells in series (36 cells times 0.5 volt each = 18 volts). And 36 * 1.75 (each cell in theory averages 1.75 watt) watt = 63 watts. The amps you will be getting is 63 watts divided by 18 volts = 3.5 amps.
III. Solar cells basics:
The front of the cells (blue side, aka Sunny side) has two thick white lines, called bus bars. They are the negative terminals of the cell. The back side, where the 6 square dots are, are positive terminals. Connect the tabbing wires from the bus bar of the first cell on one side to the three dots of on the back side of the next cell. That way you have a series connection. Repeat the process on the other side of the cells. In panel making you should connect all the tabbing wires on the front for all the cells first, then flip the cells over to solder the back side in a second step. Some solar cells such as SunPower cells have both positive and negative terminals at the back of the cells, but we don't have to worry about them. Most cells are negative on the front and positive on the back.
The thick white color lines, called bus bars, on front and the contact points on the back are made out of silver, and you should keep them intact. Apply solder on your them and the wires should bond. Do not use sand paper to send it down. The most you should do is to use a pencil erase to clean the surface of the bus bar or the soldering points at the back of the cells.
IV. Testing:
Make sure that you test the cells under strong sun light with the front of the cell facing the sun, at the same time connect your meters to the right terminals. Since the positive side of the cell is at the back side, you can get a metal plate, ideally copper, and place the solar cell on the plate, with the blue side facing the sun. That way you can place your positive lead from your meter on the plate to access the positive terminal of the solar cell, and place the negative test lead from your meter on the bus bar of the solar cell to get voltage and amperage readings. If you are inside the building, make sure you shine your sun simulating lamps onto the front of the cell while testing.
- Country:United States
- telephone:1-1-510-498-8221
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Item# 020-01101-12 Regular price: $38.89 Sale price: $32.28 |
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