High-performance modules with over 21% efficiency - maximum yields for your solar system

The efficiency of a solar module is crucial for maximizing your energy yields. We offer a selection of modules with an efficiency of over 21%, including monofacial, bifacial and full black modules in various designs.

Our modules are equipped with various cell technologies: from p-doped cells to n-doped cells and innovative heterojunction cells. Especially n-doped cells offer the best price-performance ratio and the latest half-cell technology to maximize yield.

We carry products from leading manufacturers such as JA Solar, Jinko Solar and Trina Solar with a nominal output of up to 660 W. Thanks to our partnerships with leading distributors in Europe, we guarantee you the best prices.

With highly efficient modules, you can rely on maximum yields and state-of-the-art technology - ideal for private and commercial applications. Use the filter options on our platform to quickly find the right module and secure sustainable energy at attractive prices.
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Solar modules with top efficiency

Solar modules with top efficiency stand for maximum energy yield and offer efficient use of roof or open spaces. With an efficiency of over 21 %, they are among the most powerful modules on the market. But how is the efficiency of a solar cell determined and what factors influence its efficiency?

How is the efficiency of a solar cell determined?

Efficiency is determined under precise and reproducible standard test conditions (STC). These include

  • Irradiation: A flasher is used to simulate a radiant power of 1,000 W/m².
  • Temperature: The ambient temperature is kept constant at 25 °C.
  • Light spectrum: The natural sunlight is precisely simulated.
The power of a solar cell is calculated by multiplying the current and voltage at the point of maximum power (Pmpp). The efficiency is calculated by dividing this output by the irradiated energy.

For quality assurance purposes, customers often receive a flash list in which the actual performance data of each module is recorded. These can be clearly assigned by serial numbers.

The influence of efficiency on the efficiency of solar cells

The efficiency of a solar cell describes how much of the incident solar energy is converted into electricity and is therefore a decisive factor for efficiency. Different technologies offer different levels of efficiency:

1. Crystalline silicon (c-Si): 
  • Market leader with a practical efficiency of up to 25 %
  • This technology dominates worldwide with a market share of over 95 %.

2. PERC technology (Passivated Emitter Rear Cell):
  • Maximum efficiency of up to 24.5 %
  • Particularly popular due to improved light absorption.

3. TOPCon technology (Tunnel Oxide Passivated Contact):
  • Enables efficiencies of up to 26 %
  • Reduces losses through optimized cell contacts.

4. heterojunction technology (HJT):
  • Combination of crystalline and amorphous silicon
  • High performance and future growth potential.

Natural efficiency limits and technological advances

The efficiency limits of solar cells are based on the physical properties of the materials used:

  • Crystalline silicon (c-Si): Theoretical upper limit of 26.7 % (Shockley-Queisser limit)
  • Gallium arsenide (GaAs): Maximum efficiency of 29.1 %
  • Cadmium telluride (CdTe): Efficiency limit of 22.1 %
While these limits are physically determined, the further development of technologies such as PERC, TOPCon and HJT makes it possible to approach these maximum values.

External factors that influence performance

In addition to cell technology, environmental factors also affect the actual efficiency of solar modules:

1. Temperature:
  • Solar modules heat up due to solar radiation.
  • The temperature coefficient is typically between -0.3 % and -0.5 % per °C.
  • This means that the output decreases as the temperature increases.

2. irradiation:
  • Less solar irradiation reduces the current flow.
  • Efficient technologies work better in diffuse lighting conditions.

3. performance ratio (PR):
  • Takes into account losses due to soiling, tilt angle or site conditions.

Why solar modules with top efficiency?

Maximum energy yield: Ideal for applications where space is limited.
Long-term cost-effectiveness: Higher yield means faster amortization of the investment.
Sustainability: Advanced technologies make a significant contribution to the energy transition.

Choosing the right PV technology not only determines the efficiency, but also the cost-effectiveness and environmental friendliness of a system. With the continuous development of solar cells, the use of solar energy is becoming ever more efficient, sustainable and future-oriented.


Find out more about All Black solar modules and bifacial solar modules

All Black solar modules impress with their elegant, black appearance and fit perfectly into modern building designs. They combine aesthetics with high efficiency and are ideal for residential and commercial installations. Bifacial solar modules, on the other hand, use both the front and rear sides to generate energy. They increase electricity production through reflected light and ambient light and are particularly effective for ground-mounted systems.

Find out more about inverters and storage solutions for your solar systems.