After the successful use of this technology on spacecrafts, interest and research on photovoltaic panels intensified. As plans were made and approvals given, funds flowed in. Improvements came in rapid bursts, bringing the efficiency of commercial photovoltaic panels to about 20 percent. In less than 60 years, we more than doubled photovoltaic efficiency.

Currently there are photovoltaic panels that boast 30 percent efficiency. These are specially doped triple junction cells that began its development as dual junction cells. However these phenomenons are largely confined within the laboratory and engineers are still unable to produce such solar panels in large quantities without charging consumers an arm and a leg for it. More work remains to be done before common retailers stock up solar panels endowed with this technology.

In practical there is nothing much we as consumers can do about technology. You may be surprised the little we do to make our solar panels achieve top efficiency really goes a long way — this is because solar panels are designed to last for decades, and small differences add up.

The most important thing we can ensure is to install our photovoltaic panels in the right orientation and tilt angle. The optimal position helps photovoltaic panels receive the most sunshine throughout the day and across different seasons of the year. This helps reduce the payback period. If you are living in the northern hemisphere (like most of us do), then you’ll need to orientate your solar panels toward true south (as opposed to magnetic south). You also need to tilt them to the correct angle, depending on the latitude of your photovoltaic panel site. The correct installation position will allow your solar panels to be exposed to direct, unobstructed sunshine from 9am to 3pm everyday.

Most homeowners do not understand the adverse effect that shading can have on their photovoltaic panels. Even if only one solar cell is shaded, its entire power output of the solar generator can be dramatically reduced. The individual photovoltaic cell that is now shaded acts as a resister that drains the electricity generated by its neighbors. As resistance increases, power reduces.

Another seemingly minor event that reduces panel efficiency is the accumulation of dust on the glass surface. This dissipates sunlight that would otherwise reach photovoltaic cells for power generation. Since dust and dirt will inevitably collect, the only solution is to wash the glass surface regularly. If you’re living in a relatively dust-free environment, this should be an infrequent activity.

Temperature also affects photovoltaic panel efficiency. The higher the temperature, the further its efficiency drops. Unfortunately more heat is collected as solar panels experience more sunshine. Thus efficiency tends to taper as sunlight intensity increases. Therefore we have to ensure that our photovoltaic panels are installed sufficiently far away from roof shingles. The gap in between the roof and photovoltaic panels also allow air movement to bring away additional heat that may otherwise be trapped there.

John Greenspan is an expert in DIY solar panels and has build several solar power generators in the last ten years. Are you interested in building DIY Solar panels? Pick up your FREE “How To Build Solar Panels” eBook at => http://www.diysolarpanelsworld.com

Article Source: http://EzineArticles.com/?expert=John_Greenspan

If you are serious about creating green energy for your home, but want to do so on a budget, then you may like to consider used solar panels, which, in some cases, can be obtained completely free of charge.

How to Begin Looking for Free Solar Panels

There are a number of routes to take when looking for used panels. Depending on your location, it may be beneficial to try them all.

First, try taking ads out in your local paper, scouting web forums and asking any friends or neighbors if they are, or know of anyone who is, upgrading their home energy system. Often, these people will be willing to offer their old panels for free, or at a very small cost.

Next, it is advisable to track down some installers in your area. Installers may be able to offer you old panels or put you in touch with someone who is planning to upgrade his or her system. In addition, if an installer has received a damaged panel, he may be willing to offer it at a knockdown price.

Considerations When Taking on Used Solar Panels

Of course, the attraction of a very cheap, or free, panel can be incredibly strong. And this method of purchasing solar panels is recommended. However, there are a number of things that you should take into consideration before obtaining a used panel.

Principally, as mentioned above, used panels are acquired when someone chooses to update a system. Therefore, you may find that the panel you are about to receive is an old model with low wattage, such as 4-15 watt. Of course, this is a good start nonetheless, but it is wise to bear in mind that you are unlikely to find a sophisticated used panel.

Similarly, if you are thinking of purchasing a damaged panel from an installer, it is a good idea to assess the damage and whether you are capable of fixing it yourself.

If it is simply aesthetic damage, then, of course, the panel itself will still function well. However, internal damage will need to be repaired. If you are unable to do this yourself, you will need to ask advice from a specialist, which may be expensive.

Nevertheless, it is certainly worth searching for a good used panel, as there are definitely some available. It is possible for anyone, no matter what their budget, to find ways of living partly or solely off the grid.

So, what are you waiting for? Get out there and start hunting for free used solar panels today!

Article Source: http://EzineArticles.com/?expert=Joan_Yankowitz

If you want to start making some significant changes, you need to learn how to build low cost solar panels by asking the right questions, finding your materials, coming up with a plan, purchasing used solar panels, and mounting your equipment.

Questions to ask before building solar panels

1. Ask the Right Questions – The first thing you need to know when you want to learn how to build solar panels is to understand how much power you want to generate, how much sunlight you currently receive, and most importantly, how much you are willing to spend..i.e. what is your budget?

2. Locate the Best Stores for Construction Materials – Often the most expensive part of a project is not in the panels themselves, but in the commonplace materials you need to build them. Before doing any kind of planning, locate your cheap sources, such as electrician shops, local hardware stores, RV shops, etc.

3. Come up with a plan – The next thing that you want to do is to determine how you will build your panels. If your project is small, then look for an inexpensive solar install kit. However, if your panel project is somewhat large, then consider a solar installation guide for your project. You can learn how to build solar panels from some good books, which are only a fraction of what a professional install might cost you.

4. Locate & purchase your panels – Now that you have your basic materials, a guide, and quite possibly a plan, you can now find your solar panels. New solar panels are generally expensive, and should be avoided. Older and slightly used panels are your best bet, and will probably still have their original solar efficiency.

5. Mount your panels – Once your panels are built and wired together, you need to mount your panels in a good place. There are several mounting methods you can look into, but generally you will need to choose between mounting them on a roof, via pole mounts, or on the ground. Whatever you choose, it should be in a good place.

If you want to learn how to build solar panels, just remember..you can do it. It simply requires research, planning, knowledge & a bit of preparation to start any successful & inexpensive solar installation project.

Myth #1 – Solar panels only work in bright hot desert

Reality: Although solar panels tend to work the best in bright sunny areas, in reality, they can work anywhere. Building low cost solar panels with newer, more energy efficient solar panels allow much wider use. This is true because solar panels need only UV light to work, found in both sunny and cloudy regions.

Myth # 2 – Solar power is too expensive

Reality: Building low cost solar panels have now become cheaper and easier. New thin-film collection systems are paving the way for cheaper solar installations. Photovoltaic crystals no longer need to be grown slowly in a lab and can now be printed, applied, & customized. With a government grant, building solar panels for your home can be cheaper than ever.

Myth # 3 – Solar Panels are heavy, ugly, and unsightly structures

Reality: In the old days, building low cost solar panels took a lot of panel to product a small amount of electricity. Panels weren’t very efficient, and it used a large photovoltaic crystal. Solar panels have evolved to include solar roof tiles, solar shingles, thin-film panels, or any customized look.

Myth # 4 – Power companies will charge me for using solar panels.

Reality: This myth seems somewhat hard to believe, but there are those who believe the power companies will punish them for self power generation. This is not at all true. Power companies are constantly on the search for newer, cheaper, & cleaner forms of electricity. The power that you produce can power your home, and any leftover can be sold back to the grid. Building low cost solar is a win-win situation for everyone.

Myth # 5 – No literature exists that can give information about building solar panels.

Reality: Twenty years ago, it seemed the only place to find information about building low cost solar was via some specialized books or electronic shows. Solar panel systems were small and hobby-like, and not at all for the purpose of powering entire homes. Now, if you are building low cost solar, you can find information everywhere. If you are building solar panels for your home, you should start with a good solar panel guide to show you the materials needed and steps involved in constructing your solar project.

But before you start building your own solar panels, you need to find out some important information, such as how much power is needed, what materials are needed, or even the legal ramifications of building the panels, in the first place.

Here are some questions you should ask, before beginning your project:

1. How much electricity do you need? One of the very first steps before building do-it-yourself solar panels is to check your electricity bills and evaluate how you can reduce your current usage. Beyond power saving steps, you need to know how much power will you need to produce each year.
2. What direction does your roof point? One of the most common items that people miss is the direction that their panel is facing to the sun. You should check which portions of your roof get the most sunlight in the morning, middle, and afternoon. Also as the seasons pass, you should note which areas seem to get the most exposure all year long.
3. Is your roof strong enough for solar panels? Face it, building do-it-yourself solar panels and mounting them on your roof is going to put it through tremendous loads. If it is not structurally sound to support them, you should check into other options such as installing them on the ground or on an external structure.
4. Do you have all the tools & materials you need? Starting with a good solar guide is probably the first step, before purchasing all of your materials involved. Sure, you can buy all recycled parts and build a system for less than $200. But if you want to build a system big enough for your house, you’ll need to shop for a few extra tools & parts.
5. Does your neighborhood or city allow solar panel installations? This one is probably one of the most important questions to ask. Does your city have any rules about solar installation, or more importantly, do you have an association which has rules about building do-it-yourself solar panels. Also, does your city require you to apply for a construction permit, for your project.

Once you have answered all of these questions, you will have a good idea about how to start your solar panel project. A good installation guide is key, but doing your research is a priceless step you can’t be without.

Ultimately, you want your solar panels to point in the best possible direction, to harness the most sunlight. Every one of your solar panel mounting options has advantages and disadvantages that you should consider.

Top 3 solar panel mounting options

1) Roof Mounting – This is the most common mounting option available. Considered a cost effective solution, you are able to directly mount the panels to the structure of the roof. In weather conditions, this can be the most structurally sound location. In addition, if you have a lot of roof to work with, you can tie a large number of solar panels into one integrated system. However, the downside is the sheer bulk involved. If your roof is not able to handle the heavy load of the panel system, should should look at alternate options.

2) Pole Mounting – Often steel mounted and highly adjustable, pole mounting is one of the best solar panel mounting options available. One of biggest flaws behind a roof mounted system is its inability to obtain 100% solar coverage on your panel. A pole mounted system makes up for this flaw, since you can install your solar panel in the best possible location, based on your existing knowledge of your yard’s solar coverage. The only downside is your quantity limitation. Pole mounted systems usually have a safety maximum of 6-8 modules, unlike many roof mounted systems.

3) Ground Mounting – Sometimes when your roof is took weak, and pole mounting is simply not an option, it is best to go with ground mounting. Although not quite as adjustable as a pole mounting option, ground mounting does have its perks. In areas where you have lots of ground space, you are able to discretely layout large numbers of tied solar panels in one place. The only downside of this mounting option is usually in expense. Construction of the steel supports, concrete structures, and galvanized footings can often cost more than the panels themselves, so this is something to look out for.

Although roof, pole, and ground mounting are currently the most popular of the solar panel mounting options, they are definitely not the only ones. Tracking mounts, mobile systems, and building integrated photovoltaics are additional solar mounting systems to consider.

5 Solar Panel Ground Mounts Materials

1) Steel – Although this material is typically considered to be among the strongest mounts available, it can have its drawbacks. If you live in areas with a higher amount of humidity such as the Pacific Northwest, or the Southeast, you are more than likely to experience larger amounts of rust usual. If you are going to use steel, just make sure to paint the solar panel ground mounts frequently.

2) Stainless Steel – Coming in a wide variety of alloys, stainless steel ground mounts provide the greatest protection against the element. Just make sure to choose an allow that is easy to drill and weld, as most are a bit challenging to work with. All in all, stainless steel solar panel ground mounts are a strong and more economical choice to regular steel.

3) Galvanized Steel – Considered to be one of the hardest materials to weld and drill, galvanized steel is much stronger than most materials. This is because the material has been strengthened in an industrial process. Despite its difficulties, it also the most versatile. Galvanized solar panel ground mounts come in a wide variety of shapes, sizes, and angles, allowing you to design the mounting system you want.

4) Aluminum – This material is the preferred material in the solar panel industry. It is lightweight, corrosive resistant, and extremely strong. However, on the downside, it is typically more expensive to purchase, and very difficult to work with. While aluminum solar panel ground mounts are not as strong as steel, it is generally easier to use than most steel components.

5) Wood – The weakest out of all the solar panel ground mounts, wood materials should be used sparingly. As with any construction, wood cannot withstand weather at all. Although wood is the cheapest route to go, it will likely cause more maintenance expense in the long run. However, if you are still interested in this type of material, you should look into treated wood, which is designed for weather resistance.

Now that you have had a glimpse of the different types of materials for solar panel ground mounts, you should research these types a bit more. There is no one perfect answer for every situation, so you should consider all your options very carefully.

But, what if solar panel efficiency rating is not as important as you might think? This rating is probably one of the most misused and misunderstood solar panel ratings in existence. Here are a few hidden details that most dealers don’t want you to know:

1) The Solar Panel Efficiency Rating is worthless without the negative tolerance rating.

Imagine you are a buyer, and a dealer is offering panels with a rarely high solar panel efficiency rating. Sounds like a good deal right? Well, if you did a little research into the specs of the panel, you might find out that the negative tolerance rating or the minimum warranted power rating was 15%. This means if the panel you are purchasing is rated to create 240 watts of power, in actuality, the panel could only max out at 204 watts. Before being fooled into a great efficiency rating, check the negative rating first. Anything more than 5% is simply unacceptable.

2) Don’t trust the Solar Panel Efficiency Rating on newer technology panels with low, introductory warranties.

It seems every day, solar engineers and manufacturers are coming out with newer & cheaper ways to develop thin solar cells in a variety of shapes and sizes. Technological advancement is great, but you shouldn’t get caught up in the glitz when purchasing these newer technologies. The solar industry standard warranty is 25 years, even on newer thin panels. If a dealer is trying to sell you panels with anything less than 25 years, then something is wrong.

3) Avoid dealers which advertise high solar panel efficiency rating with rapid energy returns or payoffs.

One common gimmick a solar panel dealer uses is to advertise panels with huge & super quick energy returns, on their investment. This alludes that the buyer will quickly earn their investment back, as soon as the panel starts producing power because of the high quality of the panel. When in reality, this is simply not the case. Rapid energy return can actually indicate a cheaper manufacturing process, resulting in cheaper quality, and possibly higher negative tolerance rating. So, it is important to be aware of these false gimmicks, when purchasing panels.

Buying solar panels can be a tricky and often misleading process. If you don’t know what you are doing, what you are looking for, and how to spot the cheats from the legits, it will be difficult to find high quality solar panels.

Find out more tips on how you can spot substandard solar panels, and start building your own solar panels.