Posts Tagged ‘6 x 6’
» posted on Tuesday, May 18th, 2010 at 2:30 am by Woody Wilson viewed 123 times
Solar Photovoltaic (PV) Panel DIY Project
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post a comment | filed under Featured Posts · Free Energy · Solar PV Panel | tags: 6 x 6, 6x6, energy storage offgrid
» posted on Tuesday, March 23rd, 2010 at 12:32 pm by Woody Wilson viewed 120 times
Built Solarpanel Installation Now Operational
Posted by Chris van der Zwaal in Solar energy
Last spring (2009) I wrote my first article about building my own solar panels (just to be clear : for making electricity) . At the end of the day on December 31, 2009, I had finished installing my panels totalling about 400 Wp. So now its time for an update.
The Solar Cells
The installation is made up of 8 panels, 27.5 x 40 inches each. The panels are made with solar cells, size 6 x 6 inches. I estimate the power of the panels to be 50Wp (or slightly higher) each. These cells were new and unused, lying somewere on a shelf in a warehouse, almost forgotten. I got them pretty cheaply (around $ 0.62 per Wp), understandibly because the efficiency is only 9 %. And that, these days, is considered very low.
Picture of the Cells
Transmissivity of Glass
After my article from last Spring, I have done a lot of research: the transmissivity of the glass especially kept me busy because the transmissivity of ordinary glass was very poor. To be able to measure this transmissivity, I built a test panel. I made 2 “strings” of 12 Evergreen cells (by “string” I mean cells connected in series). The picture shows these 2 “strings”. If you look carefully, you can see 2 different pieces of glass in front of it.
Without glass in front and in the sunlight, I connected each string to its own multimeter to measure its respective shortcut current. Of course, that gave different values (the multimeters as well as the strings are not equal). So by interchanging the multimeters, I got 2 measurements and averaging those 2 values gave me a pretty accurate figure of the difference. The next step was to put a piece of glass in front of only one of the strings and leave the other string without glass in front. I took a measurement and recorded it. Then I placed the glass in front of the other string and again recorded the measurements. I had to repeat these steps, but now with the multimeters interchanged. This way I got 4 measurements and by averaging these, I got a pretty good and accurate result about the influence of the light transmissivity of the glass on the shortcut current. Of course this does not measure the maximum power point of the cells, but I assumed that the result about the transmissivity will be the same. It would not be logical if it would be different. So now I was able to test the different sorts of small pieces of glass that I had gathered. In the end, I chose the most economical glass. Ordering it in a relatively large quantity of slightly more than 1000 square foot, I got it for a very acceptable price. It is 0.12 inches thick and it is tempered! The price: $ 1.90 per square foot. Of course I am not going to use it all for myself but I sell it to other DIY solarpanel builders. This way they can take advantage of my low price and also know they get tempered glass with a reasonable transmissivity. The ordinary glass measured below 80% compared to my tempered glass, which is about 90%. So now I have glass with a very acceptable transmissivity, it is tempered, and the price is pretty low! At that time I already had the 6 x 6 inch cells (they have a different size than the Evergreen cells requiring another size of glass) So part of the delivery of glass were about 40 pieces with the right size for my panels. The other 2 sizes are for Evergreen panels with 36 or 72 cells each.
And This Is What It Looks Like
The Installation Ready and Fixed to My House
On the night of December 31st, my solar panel installation was ready! The only thing to do was sit and wait for the sun, and I was lucky because the next day, the first day in the new year, it was a full sunny day. Being a day with not many daylight hours and a sun at its apex only 15 degrees above the horizon, my installation worked like it should. The first day maximum was 265 Watt of electricity “pouring” into the grid through the gridtied-inverter. The panels are almost exactly oriented to the south: 175 degrees on the (true) compass. So that is about as good as can be. The tilt of the panels is somewhat steeper than optimum for the whole year, which is around 32 degrees. I had mounted them at about 50 degrees. This is far better for the winter season as the sun is so low on the horizon. I have plans to alter the angle around April or May to accomodate for the higher apex of the sun during the summer. With my construction that will not be too complicated to do. You might be able to understand this when you look at the picture.
And This Is What It Looks Like
Some Figures and Measurements
The cells are a lot bigger than the Evergreen cells which are about 3 x 6 inches: they measure 6 x 6 inches, so they are twice the size. But as their efficiency is 9% (Evergreen cells: 14%) their output is not double, but around 55% higher. I calculated the Evergreens to generate 1.5 Wp each (placed behind the glass) so these cells must be 1.5Wp x 155% = 2.32Wp. I have 24 cells in a panel (size 27.5 x 40 inch). That gives 24 x 2,32Wp = 55,68 Wp per panel (for now I will consider them 50Wp each to have a conservative assumption). I now have 8 of those panels and they are all connected in series. They are feeding a Philips 500 gridtied-inverter (it is second hand and it is a predeccessor of the Stecagrid 500 commonly used in the Netherlands, being most presumably the same). So I have 8 x 55,68 = 445 Wp. For now I will consider it 400Wp.
Of course, I will not see this high output for some time to come, but as the sun starts to go higher above the horizon my output will also rise. That indeed is what is happening : on January 1st, I got a reading of 265 Watt, but as the days progressed (waiting each day for sunlight but most days were cloudy all day) the readings got higher indeed. So far my highest on Februari 3th was already 373 Watt !! And that is very promising.
The temperature of the cells probably was below 77 Fahrenheit (25 celsius) which is the temperature at which solar panels are tested and measured to give their WattPeakPower. With higher temperatures, this output decreases considerably (and of course at lower temps the output is higher). Roughly 1% per 4 degrees Fahrenheit (or 1% per 2 degrees Celsius). So at approximately 131 F ( 55 C ) the output is around 15 % lower. The temperature of a solar panel can go way above this temperature.
The reason that the sunlight is weaker when the sun is low on the horizon is that the light has to travel a much longer distance through the atmosphere and then a lot of energy is lost. One can calculate the comparison between several angles above the horizon. You simply compare the sinus of 15 degrees and the sinus of 20 degrees and then compare these two : sinus 20 / sinus 15 = 0.342 / 0.258. The funny thing is, and I did not expect this, the readings I got from 15 degrees (on Jan. 1st) and 20 degrees (on Jan. 28th ) are 345 Watt / 265 Watt. This is about the same ratio.
What I also did was measure the voltage and current coming out of the panels into the inverter. Multiply these figures and you get a very accurate figure about the Watts that the panels produce. Now compare this figure with how many Watts the inverter is “pouring” into the grid. Look at the picture below to see these measurements. It is a simple calculation to find that the efficiency of the inverter is about 95%, but it is not accurate as the powermeter that I use surely does not take into account any phase shift that will be there between current and voltage. I just have to assume that within certain limits it is correct, but those limits probably are “wide”.
If I take my highest reading of 345 Watt and correct it for this 95% I get the power that the panels made at that moment : 363 Watt. I have high hopes that I will see readings of higher than 400 Watt and then I can be very content. It would mean that (after correcting for the inverter) the panels are well above 400 Watt. The power meter is a simple one. I bought 2 of them. I opened one of them to internally switch input and output. I thought that it would be nescesary because the current in this situation flows in the other direction through the powermeter. However, I found that the “un”modified powermeter worked just as well. Of course this does not mean that it applies to all other types of powermeters.
Inverter
Picture of the Voltage(87.1) and Amperes(3.02) (Input-Side of the Inverter) and Power (251)(Output-Side of the Inverter)
The Cost of My Panels
I have calculated that the cost of one panel is around $ 83.00 (at the present rate of 1.39 dollar to the euro). My aim has been to get a panel for € 1.20 per Wp. I express this in euros as the rate of the dollar is changing so often and I live in an euro environment. But this € 1.20 at present equals $ 1.68 per Wp. Well it seems that I have reached that goal. But I must say that I have been rather conservative with this aim to prevent disappointments. Nice thing about this is that I will probably even go below this aim! If and when my panels produce 400 Wp I will have reached my goal, but right now it is very likely that I might even go 10% higher. So my price per Wp will be below € 1.10 or $ 1.51 per Wp. In this situation, my panels are 55 Wp each. But I must honestly say that I did not take into account the extra cost I had for buying some extra tools. On the other hand , building more panels will reduce that influence. And that brings up the next chapter.
Plans for the Future
It is a lot of fun doing this project and I have started preparations for building another 8 panels. My final goal is to make 40 of them. As you can see on the picture, my present home will not be able to accommodate many more panels, so I am very glad that I am going to buy a new home with lots of space to place the panels on the ground in my far backyard .
Some more remarks.
The panels are made exactly according to the double glass principle that I described in my first article. For some more detailed info I have a second website: http://doctersnuggles2.come2me.nl
I had hoped to have my installation ready last summer but gathering and choosing the right materials took a lot of time. It was important to do and it was worth it. Hopefully it helps to make the panels last a lot of years and that in itself will hopefully take a long time to prove. The choice of the glass especially took a lot of time.
By selling cells and other important materials for building a solar panel, I got a lot of extra ideas from others, and that was one of my aims. I got in contact with quite a few do-it-yourselvers and we exchanged a lot of information. That also resulted in a forum for “do-it-yourselfers” but it is in the Dutch language. The fact that it is there indicates that there are enough others building solar panels.
Possible Improvements
Talking about different ways to build a solar panel, I can say that there are about 5 others developing/finding a way to use EVA lamination to completely seal the cells. This is also the material that is being used by most solar panel factories. Through my contacts I have been lucky enough to get some of this EVA. It is past its expiration date, but tests have shown that it still works fine. If they succeed in finding a simple way to apply/use it, then I will start using their method too for future panels. The efficiency of the panel will increase (according to some internet articles) if the air gap between the cell and the glass is removed and replaced by this lamination. As the air is not there anymore the lightrays will have less (strong) transitions (air into glass – glass into air – air into the cell). Also the reflecting between the front of the cell and the backside of the frontglass will be less. The efficiency of the panel in this way can rise from 90% up to 95% . Read also the comments about this in my first article.
The Testpanel
one Comment | filed under Campsite & Hunting Lodge & Out Building & Field Station · Free Energy · Home Improvement · Off-Grid · Solar PV Panel · Vacation Home | tags: 6 x 6, 6×6, 6×6 solar cell, eBay, solar cell
» posted on Tuesday, March 23rd, 2010 at 11:07 am by Woody Wilson viewed 527 times
Building my own Solar Panel (in the Netherlands)
Posted by Chris van der Zwaal in Solar energy
Because I think that the price of a solar panel is still pretty high(in Europe), and because the stimulation from our government (in the Netherlands) is not so good (very,very complicated and time consuming) I started the project of building my own solar panel. I would like to invite anyone who has some experience with this or is interested in it ,to give me any advice or remarks about it. The main challenge is to build a panel that can withstand heat, cold, rain and hail for many years.
Buying My First Solar Cells
In October 2008 I bought my first 100 cells via Ebay. But as I later learned, they were still very expensive: 300 Euros for 100 cells, including shipping. I was told they should produce 1,98 Watt each. Below a picture :
The First Solar Cells
After some experimenting and very long brainstorming about how to continue, I found another seller on Ebay who had the same cells (of which he gave the specification that they were 1,75 Wp each……) But these were slightly damaged.
Well I decided to buy 500 cells ,a mix of 3 different qualities. The seller had not counted these cells but there were 620 cells, of which after a first selection , just over 500 were reasonably good. Not a bad deal to start with. And a lot cheaper! Also now I had over 100 cells for practice on soldering and handling.
The 620 Cells.
Building the First Small Panel.
Well I got started. Beginning with the soldering-technique, that takes some practice, but after a while you get the hang of it. And now my first small experimental panel is ready! The main focus and moreover challenge is to get the cells 100% sealed: air and water tight. The cheapest solution for me is to make a double-glass construction. And the cells in between the 2 plates of glass. The panel is made of 12 cells, each 0.55 Volts. On the picture below you can see many purple coloured wires. Those wires are each connected in between each cell so afterwards I can still do some measurements to compare each separate cell.
My First Do-it-yourself Solar Panel
The First Measurements in the Sun
I must say that at first I was worried whether I would see the cells really produce the power they should. But after building a variable resistance (making it possible for me to roughly find the maximum power point) the sun at last was shining (not much sunshine here beginning of February) and I got my first real measurement : 15,5 Watt. According to the specifications the panel should give a maximum of 12 x 1,75 W = 21 Wp.
Given the fact that the glass takes away about 10% of the power,without the glass it would have been about 17 Watt. I expect that during summer as the sun rises much higher above the horizon, the measurement will give higher readings , thus coming closer to the specifications…. I am using normal 4 mm (0.16 inch) glass because it costs me nothing. If you just look around near places were they renovate old houses you can get the old glass for free…… This compared to the real stuff they use for solarpanels which is quite expensive and probably very difficult to find.
Influence of Heating the Panel in the Sun.
During the first measurements, I found that the heating up of the panel was pretty strong. But this especially was the case for the backside. were the cells are glued upon (using the same kit I used for glueing and sealing the panel). This panel is 12 mm (0.47 inch) thick : 2 plates of glass each 4 mm (0.16 inch) and 4 mm in between. What troubles me is the temperature-difference between the front and backplate of glass. This will result in different expansions creating stress on the sealing,if that is repeated too often it will start leaking. Now I am using the same kit as is being used in solar panel factories. But it still worries me. A solution can be to keep the panels small, so the difference in expansion stays minimal.
Improvements
A solution to the temperature-problem can also be to make the gap between the 2 plates of glass smaller. So the heat will be more evenly dissipated to both the front and backside ( thereby also creating more cooling capacity). My next panel (picture below) is the same size,the difference is the distance between the 2 plates of glass : it is now 1.5 mm (0.059 inch) …..and this also makes the sealing a lot easier and thereby better. I have used pieces of copper winding wire that I happened to have : 1.2 mm (0.047 inch) thick. I took several pieces of about 3 cm and spread them evenly along the side on the glass backplate. Then the kit along them all around the full edge. And finally pressed the front plate on it. The result is a gap between the plates somewhere between 1.2 mm and 1.5 mm. So on the inside, there is some trapped air (with, of course, a certain amount of humidity in it), which can potentially cause condensation. But my hope is that the amount of that is so small (only very small amount of air……) that it will not be a factor…… ( In the first panel I did put some stuff that can “eat” the condensation. I got this out of old double glass that I separated,the stuff is inside the aluminium strips between the double glass edges)
The Improved Panel
The kit will have to dry for a few days, but anyhow the weather forecast does not indicate any sunshine the coming days………
First Results
Bottom line is that if the output of each cell really hits 1,75 Wp then I can come to a price of Euro 1,20 per Wp (or even lower than that….) And with such a price the panel will not have to last for 20 years……..but off course that is my aim ! That will be the main challenge ! But I must say with this second panel my hopes are getting higher.
You can find more (and more up to date) information on my website
Well, who feels like building panels also ? Or give me some advice, or share experience. I do not mind getting negative critics because they might be correct………and they are there to be solved !
Next Phase
Update: 15 februari 2010:
The first systeem of 400Wp is now fully functional and produced it’s first electricity. The cost price is now around $1.68 per Wp and is expected to drop to $1.10. More information about the next phase in the project can be read in the article Built Solarpanel Installation Now Operational.
post a comment | filed under Boat & Yacht & RV · Campsite & Hunting Lodge & Out Building & Field Station · Featured Posts · Free Energy · Home Improvement · Off-Grid · Solar PV Panel · Vacation Home | tags: 6 x 6, 6×6, 6×6 solar cell, DIY Solar, eBay, Real Experience, solar cell
» posted on Saturday, October 31st, 2009 at 1:14 am by Woody Wilson viewed 713 times
JUST ARRIVED 6X6 SOLAR CELLS imported from Germany NEW
Solar Cell 6x6 .5V 8+ amps
(Excerpt for eBay ad 11/31/09; link updated for 6×6 solar cell 3/11/10)
this is for 36 solar cells limited time
thinking about 3×6 cells? why? this is the future of solar power 16% eff.+
these are the cells every one has been waiting for, 6x6in. .5v 8+ amps the data sheet is in this ad, this is a5 day only breakout sale after this the price of solar is going up, there may or may not be small corner chips all this dose not effect the output of these fantastic cells, this is 16% efficiently the stuff everyone including you are talking and reading about hoping to get some here they are, are you sitting down
(Continued below)
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we are offering these for 3.75 usd each for this breakout sale, we have many forms of these cells we are offering around 9000 of this form now they will not last 5 days at this,we also have 5×5 cells listed that are the best you can get on ebay at this time, we have lots of cool panel building stuff,
oh ya we have the 3×6 cells that we made so popular in this market place at the best price you can find these cells are not broken or cracked they are what they are as in the ad
2 comments | filed under Energy News · Free Energy · Home Improvement · Solar PV Panel | tags: 6 x 6, 6x6, 6x6 solar cell, eBay, solar cell
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