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Mecer Solar Panels

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Solar Panels sales South Africa

Solar panels to generate electricity Despite the fact that "solar panels" is the most common term to refer to solar power, one must know that solar panels (or solar photovoltaics) are different from solar water heating systems (or solar thermal systems). While solar panels generate electricity and make it available for household use, solar ....more..

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Solar Panels sales South Africa

Solar panels to generate electricity

Despite the fact that "solar panels" is the most common term to refer to solar power, one must know that solar panels (or solar photovoltaics) are different from solar water heating systems (or solar thermal systems). While solar panels generate electricity and make it available for household use, solar thermal systems are used to heat water, which is then available for heating purposes in the house.

Solar panels are expensive - the initial costs are considerable. However, like it happens with any other big investment, one should assess the costs/benefits in the long term.

What solar panel voltage / current and power do I need?

For an MPPT controller to work correctly, the voltage of the solar panel (or solar array) must be at least 4V to 5V higher than the battery ‘charging’ voltage (not the nominal battery voltage).

This is because the panel voltage will drop under cloudy condition, or when the solar panel temperature increases. In order for the MPPT to function correctly the panel voltage must always be higher than the battery voltage under all conditions.

You may connect panels in SERIES to get to the correct voltages.

The MPPT controller will reduce the PV voltage to match the battery's voltage, and will increase the current to charge batteries using the maximum available power from the panels (within the battery's acceptable parameters).

For the best value for money, the panels' array power should be as close to the MPPT controller's power as possible. You can oversize the panel as long as they are within the maximum voltage AND  maximum current rating, however, the system will not use any additional available power from the panels, and you may be losing value for your money in this scenario.

If you have a 500W MPPT controller, the ideal solar panel array should be rated with a voltage higher than the battery AND lower than the controllers' voltage rating, and the total power from the PV panels should be close to 500W (For example, 2x 250Watt panels)

1st Generation Solar Panels

These are the traditional types of solar panels made of monocrystalline silicon or polysilicon and are most commonly used in conventional surroundings.

Monocrystalline Solar Panels (Mono-SI)

Monocrystalline Solar Panels (Mono-SI)This type of solar panels (made of monocrystalline silicon) is the purest one. You can easily recognise them from the uniform dark look and the rounded edges. The silicon’s high purity causes this type of solar panel has one of the highest efficiency rates, with the newest ones reaching above 20%.

Monocrystalline panels have a high power output, occupy less space, and last the longest. Of course, that also means they are the most expensive of the bunch. Another advantage to consider is that they tend to be slightly less affected by high temperatures compared to polycrystalline panels.

Polycrystalline Solar Panels (Poly-SI)

You can quickly distinguish these panels because this type of solar panels has squares, its angles are not cut, and it has a blue, speckled look. They are made by melting raw silicon, which is a faster and cheaper process than that used for monocrystalline panels.

This leads to a lower final price but also lower efficiency (around 15%), lower space efficiency, and a shorter lifespan since they are affected by hot temperatures to a greater degree. However, the differences between mono- and polycrystalline types of solar panels are not so significant and the choice will strongly depend on your specific situation. The first option offers a slightly higher space efficiency at a slightly higher price but power outputs are basically the same.

2nd Generation Solar Panels

These cells are different types of thin film solar cells and are mainly used for photovoltaic power stations, integrated in buildings or smaller solar power systems.

Thin-Film Solar Cells (TFSC)

If you are looking for a less expensive option, you might want to look into thin-film. Thin-film solar panels are manufactured by placing one or more films of photovoltaic material (such as silicon, cadmium or copper) onto a substrate. These types of solar panels are the easiest to produce and economies of scale make them cheaper than the alternatives due to less material being needed for its production.

They are also flexible - which opens a lot of opportunities for alternative applications - and is less affected by high temperatures. The main issue is that they take up a lot of space, generally making them unsuitable for residential installations. Moreover, they carry the shortest warranties because their lifespan is shorter than the mono- and polycrystalline types of solar panels. However, they can be a good option to choose among the different types of solar panels where a lot of space is available.

Amorphous Silicon Solar Cell (A-Si)

Have you ever used a solar powered pocket calculator? Yes? Then you have definitely seen these types of solar panels before. The amorphous silicon solar cell is among the different types of solar panels, the one that is used mainly in such pocket calculators. This type of solar panel uses a triple layered technology, which is the best of the thin film variety.

Just to give a brief impression of what “thin” means, in this case, we’re talking about a thickness of 1 micrometre (one millionth of a metre). With only 7% efficiency rate, these cells are less effective than crystalline silicon ones - that have an efficiency rate of circa 18% - but the advantage is the fact that the A-Si-Cells are relatively low in cost.

3rd Generation Solar Panels

3rd generation solar panels include a variety of thin film technologies but most of them are still in the research or development phase. Some of them generate electricity by using organic materials, others use inorganic substances (CdTe for instance).

Biohybrid Solar Cell

The Biohybrid solar cell is one of the types of solar panels, that is still in the research phase. It has been discovered by an expert team at Vanderbilt University. The idea behind the new technology is to take advantage of the photosystem 1 and thus emulate the natural process of photosynthesis. In case you want to learn more about how the biohybrid solar cell works in detail, read more about it in the American Journal of Optics and Photonics. It explains more detailed how these cells work. Many of the materials being used in this cell are similar to the traditional methods, but only by combining the multiple layers of photosystem 1, the conversion from chemical to electrical energy becomes much more effective (up to 1000 times more efficient than 1st generation types of solar panels).

Cadmium Telluride Solar Cell (CdTe)

Among the collection of different types of solar panels, this photovoltaic technique uses Cadmium Telluride, which enables the production of solar cells at relatively low cost and thus a shorter payback time (less than a year). Of all solar energy technologies, this is the one requiring the least amount of water for production. Keeping the short energy payback time in mind, CdTe solar cells will keep your carbon footprint as low as possible. The only disadvantage of using Cadmium Telluride is its characteristic of being toxic, if ingested or inhaled. In Europe especially, this is one of the greatest barriers to overcome, as many people are very concerned about using the technology behind this type of solar panel.

Concentrated PV Cell (CVP and HCVP)

Concentrated PV cells generate electrical energy just as conventional photovoltaic systems do. Those multi-junction types of solar panels have an efficiency rate up to 41%, which, among all photovoltaic systems, is the highest so far.

The name of such CVP cells is related to what makes them so efficient, compared to other types of solar panels: curved mirror surfaces, lenses and sometimes even cooling systems are used to bundle the sun rays and thus increase their efficiency.

By this means, CVP cells have become one of the most efficient types of solar panels, with a high performance and efficiency rate of up to 41%. What remains is the fact, that such CVP solar panels can only be as efficient if they face the sun in a perfect angle. In order to reach such high efficiency rates, a solar tracker inside the solar panel is responsible for following the sun.

How to install the solar panels

In South Africa, solar panels are installed on North Facing roofs.  North West or North East roofs will work but is less efficient.

Solar panels should be mounted tiled at an angle of 30 degrees, or between 25 and 35 degrees. Brackets with adjustable angles can be used to adjust the angle of the panels to 30degrees. This  may not always look aesthetically pleasing or ideal. Panels should never be installed flat.


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