All, even the best photovoltaic panels, share the same common structure. The photovoltaic panel is, in fact, the fundamental unit of a photovoltaic system; it is made up of several photovoltaic cells , which capture solar energy and transform it into electrical energy. Each cell is connected to the others via metal strips , forming electrical circuits, in series and in parallel.

On the back of the panel is a support surface , usually made of insulating material (so as not to absorb and disperse energy). The cells are instead covered with tempered glass . Layers of EVA (vinyl acetate) are inserted between each surface, and the whole thing is die-cast .

Why is it important to know how a panel is made?

 Because materials and technologies impact the quality of the product. And where there are excellent photovoltaic panels, then the system has all the credentials to become a source of clean energy and save money—or rather, profit—on your bill.

Goodbye polycrystalline: the best material is monocrystalline silicon

Even for 2025 , the best photovoltaic panels are those made of monocrystalline silicon , because they combine efficiency, i.e. high yield, with longevity.

The reason for the high performance lies in the very structure of silicon: monocrystalline, unlike polycrystalline, is made up of a single crystal ; its lattice is continuous, without interruptions within it. In the silicon crystal, there are therefore no empty or dead areas, nor misaligned points: this continuity makes it more efficient, capable of absorbing and converting greater energy .

Precisely because of their low efficiency, polycrystalline panels are currently out of production : therefore, be wary of anyone offering them to you, always and only demand monocrystalline silicon.

But there is monocrystalline and monocrystalline

Obviously, the purity and continuous lattice of monocrystalline silicon alone are not enough to offer a top-quality product; other variables come into play, such as the support structure, the panel coating, and the glass used.

In particular, the parameters to take into consideration, to distinguish between monocrystalline series A and series B, are 3:

Efficiency . As mentioned when talking about polycrystalline panels, efficiency is a measure of the panel's ability to convert sunlight into electricity. The higher the efficiency, the more energy the panel converts;

Temperature coefficient . This is a measure of the decrease in panel performance in proportion to the increase in ambient temperature; in other words

how much the panel lose temperatures  in summer?

 The higher the temperature coefficient (it's a negative number), the better the photovoltaic panel;Efficiency and guarantees: do you know how to choose the best photovoltaic panels.

The best solar panels: a myth. Not at all, they really exist, and you too can learn to recognize them, thanks to this guide from T-Green.

Choosing the best photovoltaic panels is important to ensure the success of your investment : a system that doesn't convert energy optimally is decidedly of little use, as it will constantly have to contend with adverse weather conditions, clouds, reflections, wear, and other inconveniences. Only with top-quality modules can these problems be avoided .

Efficiency and guarantees: do you know how to choose the best photovoltaic panels.

How to recognize the best photovoltaic panels

To understand the quality of a particular brand's photovoltaic modules, you need to consider some parameters that manufacturers may declare, including:

Constituent material of the module

Efficiency percentage

Resistance to weight and water (sometimes even snow)

Operating threshold temperature (cold and hot)

Existence of a superior covering material

Frame material

Panel thickness

Media type

In addition to these structural features , there are guarantees : performance guarantee and duration of the product's insurance coverage.The best high-end solar panels: SunPower

Based on all these parameters, a distinction is made between classic monocrystalline and high-efficiency monocrystalline: the classic one promises a lower performance than the high-efficiency monocrystalline panels.

This is the case of the high-efficiency Sunlife Solar panels , which we at T-Green have confirmed as the best photovoltaic panels also for 2025 in terms of production yield . Sun power panels are 22.7% efficient , the highest currently on the market. They come with a 40-year warranty on both performance and product, and the manufacturer claims that, after 25 years of use, the panel still produces 20% more power than other panels. Furthermore, the mono crystalline cells offer 28% more power than competitors.

Sun-power Max-eon 3 solar panels are considered among the best of 2025 for many other reasons! Discover them in our free guide to the brands selected by T-Green.Sun power panels are 22.7% efficient , the highest currently on the market. They come with a 40-year warranty on both performance and product, and the manufacturer claims that, after 25 years of use, the panel still produces 20% more power than other panels. Furthermore, the mono crystalline cells offer 28% more power than competitors.

Sun-power Max-eon 3 solar panels are considered among the best of 2025 for many other reasons! Discover them in our free guide to the brands selected by T-Green.A

Materials warranty . Last but not least, the warranty: it is essential to protect you from any failures, due for example to manufacturing defects or atmospheric events. The average is 10 years, the best panels increase it to 25 or even 40.