Hybrid solar panel photovoltaic or pv and thermal
Valuable time ago I bought some PV cells(6"x3, On rebeccayi0904 on ebay,
Stores That Sell Oakley Sunglasses, Great seller!) With aim of building a PV panel(Reading a plaethora of instructables on solar panels here!). While testing the personal cells out there in the sun I noticed that they got quite hot. I then realized that PV panels convert to electricity only about 12% of the solar that gets to them. You'll see the rest? It results heat(Which entails 88%). I figured that perhaps in the same surface one can harness both the electrical energy and the thermal energy of the panel.
Comfortable.
(1) Note that you will don't want to use broken cells if only a few are nbroken as it affects the WHOLE panel output in proportion to the % area missing in the ONE cell. Eg if a single cell has 10% area missing then the panel output will be 10% lower if all cells are otherwise the same. Because of current out is proportional to cell area while voltage is essentially nnaffected by area. So if you wire an 800 800 800 600 800 800 mA cell string in series the 60 mA of rock bottom cell"Throttles the while thread. In many cases if you have only one low output cell you may need to be shorting it out than leaving it in. Eg for people with a 36 cell 18V nominal panel, If you short out one cell you receive a 17.5V small panel. In practice it wioll usually be somewhat higher and in many cases when driving a 12V system with Vmax battery lead acid = 13.8V this 17.5V at full current provides improvement over 18V at reduced current.
(2) The cooling water will prove to add 5% to 10% to panel output on a hot day. I have tried doing a very thin film of water over a panel surface with excellent results. Needs a continuing water supply or a pump: ). Forbid its members to put them to use for the same reason(Yet water solar cells, Not PV were found to be OK.
If it's area, There isn't much you can use about that without infringing on the panel's efficiency. They must admit all the blue light they can which means red to match roof tiles or green to match trees is unthinkable. But purple or cyan might be simple. :)
What's interesting is that removing heat from the thermal section should actually help act as an active cooler for the PV section,
Oakley Store Online, BOOSTing its conservation!Professionally aesthetics is a relative topic,Relative to individual. In my opinion I go for function first aesthetics last. All I can say is to hunt for collectors with the least amount of bulk can be painted to match the surfaces the are mounted on. The frame and hanging hardware can be painted, Not sure how to mask the important collector while retaining the function. Was a time a TV antenna was a status symbol, But a lack of one indicated we are able to afford cable TV also a bit of status symbol:) Perhaps a good decorator could give advise how to mount a collector so it would match other structural elements?
You won't be sure how a particular panel will perform until you build it and test it like this instructable shows.
As an aside great instructable,
IF a person had the regular type of flat plate solar collection system already then you'll be able that the lower level heat coming from this type of panel could be used to preheat the coolant going to the flat plate collectors providing you built enough of these to get the coolant flow rates that you need for 2 arrays plumbed in series.
Run it through this type pf panel first then to the flat plate lovers.
You could even use the same pumps without having to add any. A a number speed pump) On a really good solar collection day to increase the flow a bit so they won't overheat any of the panels?
I guess I'll inquire when I build it.
As long as the home built panels are to be used for things off grid then there won't be any legal issues with certifications on the solar power systems hooked to the power grid.
Appreciate the comments(This and the sooner one, I am giving an answer to both at once).
1) I used the thinner pipes basically given that were easier to bend and cheaper(I had already spent much more than I decided, Write: One might use a cheaper insulator than the sil pad if you are careful enough even tar paper will do). For this size panel I consider that the 1/4" Tubing is enough(I think it is hard to believe one should collect more than 50% of the sun light). Contrary, I could have liked to use a thicker aluminum backplate(Wasn't patient enough to anticipate one, And truly thickest I could source locally). Wine to match. would be to place the pipes closer together.
2) For larger panels make sure to have larger water flow to avoid the chance of it heating too much(At which your heat capture would drop drastically). If there are several panels, I could possibly connect the pipes in parallel rather than series, Again because once the water becomes too hot your heat capture will appear reduced.
3) Book my comment on"Probably will 14, 2010. 7:31 evening" About lightweight material extruded panels. I think these are used for the side walls of 18 wheeler trucks and maybe are affordable if you can source them(I could not). This will be the best choice(Certainly basically little soldering,
Wholesale Discount Oakley Sunglasses, Best waterflow and drainage, Best thermal hookup,
Oakley Sunglasses For Cheap, Probably quite good solidity).
4) Even, Book my comment on"November 14, 2010. 3:01 evening" About aluminium and copper brazing without flux. I bought some of the merchandise on ebay and they work great(Few nasty fumes, At least not that I could tell). Note that you do need to get the materials quite hot for it to work(Milder than tin soldering).
5) Please supply an update(A lot better,
Wholesale Discount Oakley Sunglasses, Post an instructable and put the anchor text here) When you build your burglar alarm,
I have been in need of for one like this.
I want to build from scratch a whole array of any of these panels.
You have got a good thermal conversion/extraction from this panel, You can probably get around 800 BTU per day/square foot of collector.
I have one rrssue the though, Perhaps it would be better to use 3/8" Copper lines?
By means of 1/4" Towards 3/8" Tubing would ones flow of coolant 2.25 time periods.
I realize the coolant will have to flow through it slowly to pick up the heat but if I have too much these on an array together then the flow becomes an issue.
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