Low shipping costs for all orders.


100% money back guarantee.


Friendly Customer Service

Photovoltaics, energy storage, heat pumps, small wind turbines and combined heat and power as well as the multitude of possible combinations show the opportunities offered by the energy transition – within a building. The picture of how the energy transition can be created and how electricity and heat can be obtained 100% from renewable energy is becoming ever clearer. After the knowledge comes the skill. But before the will comes the will. If we want to go this way together we will make it and make us all winners. We hope that we can give you some suggestions for your journey with our website.

At temperatures above 1,410 degrees Celsius, the silicon with the dopant boron is melted, crystallized into blocks, and then sawn into columns and later sawn into wafer-thin slices, the solar silicon wafers. These are the first central intermediates of the integrated production process. By using continuously optimized technology, leading wafer producers are able to continuously reduce the thickness of the slices. This minimizes silicon consumption. the surface with phosphorus creates the p-n junction through which the solar cell becomes conductive. The front and back sides are electrically separated.

For silicon to become a power-generating solar technology, the raw material must go through a high-quality production chain.
In order to use as much sunlight as possible, a wafer-thin silicon nitride layer is deposited, which gives the solar cell the characteristic blue color and reduces the reexion of the sunlight. So that the electrons released by the sunlight can be led to the consumer, the contacts on the front and back are printed and fired in the next three process steps.

Global Radiation
In the photovoltaic use of solar energy, the radiation of the sun is converted into electrical energy by means of solar modules. For the planner of a solar system, radiation data is the essential basis. With their quality
stands and falls the reliability of the yield forecast. There are several data sources for many sites. In Germany, the data for solar irradiation is comparatively good.
Generally, at least two, better three different data sources should be used for potential plant locations and the values should be averaged. Design tools that also produce a yield forecast have deposited radiation data for many regions.

Renewable Energy


Complete Solar System and Accessories

Photovoltaic Systems

We offer individual concepts and comprehensive advice! Our services:

  • Building design
  • Application at the energy provider
  • Economic view analysis over 20 years
  • Germany-wide assembly
  • Network Connection
  • Commissioning and maintenance

Complete system including assembly and electrical installation nationwide. Storage systems grid-connected systems and or island system or hybrid systems.

Planning & Assembly

You benefit from our many years of experience.

In recent years, with our experienced team, we have planned, built and “put into operation” more than 1000 photovoltaic systems. The sizes of the photovoltaic systems are between 100 watts and 1500 kWp. Our experience covers nearly 100 MW installed capacity.

Our strength lies in the turnkey planning and construction of solar systems for single-family homes and small businesses. Ask us and let us convince you! You benefit from our many years of experience. For today – and tomorrow!

Which solar module for your house?

Anyone who has opted for a photovoltaic system as a power producer faces the question of which technology to use. Crystalline modules, thin film, silicon or any other material? The majority of the solar modules consists of the semiconductor material silicon. Silicon is ideal for solar technology – the second most abundant element of the earth’s crust, it is virtually unlimited. Nevertheless, there are also major differences in the silicon solar cells resulting from the different production methods: There are two major categories of silicon solar cells or modules. On the one hand there are the crystalline modules.

Here one differentiates further between monocrystalline and polycrystalline solar modules. On the other side there are so-called. Thin-film modules. Which module is better suited for which roof depends on the individual requirements of the operator and the circumstances of his house.
Regardless of which module type the plant operator decides, he should opt for long-lasting quality modules. Because only solar modules that fulfill their service over a period of 20 years – and far beyond – are economical and bring the hoped-for returns.

Selection Criteria for Solar Panel

Which cell for which purpose?


  • Efficiency: 13-20%
  • Suitable for small roof areas – advantages in diffused light
  • Higher cell voltage
  • Good annual energy yield


  • Efficiency: 6-12% (CIGS up to 15%)
  • Low material usage – thus cheaper


  • Efficiency: 12-18%
  • Low energy consumption during production
  • Good value for money
  • Ideal for small installations such as single-family homes
  • Suitable for agricultural use: Double glass modules are robust against the effects of the weather or aggressive air pollutants

Production Costs

  • Flexible application options
  • Customization in size and design
  • Favorable price per square meter
  • Better low-light behavior
  • Ideal for non-south-facing or partially shaded roofs

Installation Types

Photovoltaic modules can be installed on almost all types of roofs. When choosing the type of mounting, optical and architectural aspects also play a role in addition to the most favorable orientation and inclination for the modules. Cleverly installed, they are a real eye-catcher and the building is upgraded.

For mounting on the roof, there are several options open to you: The most common is the on-roof and in-roof mounting. In the on-roof installation, the solar modules are mounted with a construction above the roof. In the case of in-roof mounting, however, the modules are integrated into the roof surface. More efficient is the on-roof mounting, because silicon is a semiconductor and works better at low temperatures. In the case of roof-mounting, the ventilation is not optimal.

Solar & Photovoltaic Inverter design and planning

The inverter is the heart of every solar power system: It converts the direct current of the solar modules into commercial alternating current and feeds it into the public electricity grid. At the same time, he controls and monitors the entire system. On the one hand, it ensures that the solar modules always work in their irradiation and temperature-dependent power maximum. On the other hand, it continuously monitors the power grid and is responsible for complying with various safety criteria.

The right inverter for every plant – Flextech Energy

There are a variety of solar inverters available on the market – the devices can be classified according to three important characteristics: the power, the DC-side design and their circuit topology.

Plan photovoltaic system:

The expert planning and design of the system initially takes into account the conditions at the site when selecting and connecting the modules: roof pitch, possible shading and, of course, the alignment. Highest yields are achieved in Germany with an orientation of the modules to the south and a slope of about 35 degrees. After that, choosing a suitable inverter in terms of power and technology is crucial. The rated output of the solar generator may be up to 10% higher than the nominal power of the inverter.

Basically, to make it easier for our customers to plan a system, we offer our customers ready systems of 100 watts – 1 mega watts. In our selection, the right system is for everyone who wants to build a photovoltaic system. With or without memory, mounting materials of all types, quality and all price ranges, modules from 20 Wp – 330 Wp per panel, solar cable and plug MC4 Mc3 Yukita as well as all the Smart Home elements you need to evaluate and operate your photovoltaic system.

In the photovoltaic (PV) industry, standards have become increasingly established in recent years, increasing the reliability and safety, ie the quality of the photovoltaic systems. If you divide the structure of a PV system into trades, you get six subregions.

  • Planning / Project Planning
  • modules
  • Inverter (solar storage)
  • substructures
  • Electrical system components
  • Wiring of the system
  • Energy Storage Systems

A useful addition to the photovoltaic system

Independence, comfort, cost-effectiveness: Since 2012, the new lithium storage batteries have created an energetic future for photovoltaics.
Intelligent energy storage enables homeowners to achieve a degree of autonomy of up to 80% with a low-maintenance, robust system with integrated energy management – regardless of whether it is day or night, sunshine or clouds. Here we offer flexible solutions for new & existing plants.

Market leaders in the energy storage market are:

SMA, LG Chem, BYD or Mercedes Benz energy storage. In conjunction with the world market leader SMA in the inverter sector, in combination with the Sunny Island devices, we offer a perfect solution for new and existing systems.

Performance verification of PV systems:

New in our program is the examination of existing photovoltaic systems. For this purpose, we have a nationwide dealer network, which puts your solar & photovoltaic system through its paces. We not only evaluate but also offer suggestions for improvement and an optimization plan to get the maximum out of your photovoltaic system.
Contact us!

Featured Products