Just What You Should Learn About Solar Power

Is solar power worthwhile in the home?

01/25/2021 | Business with the sun is booming: numerous solar modules are already shining in German residential buildings, and interest in photovoltaic systems continues unabated. But before buying a solar system, every homeowner asks himself: Is a solar system on your own roof worthwhile at all?

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With a PV system you save CO₂ emissions and money

Benefit from the return

The good news first: A photovoltaic system in your own home is worthwhile in almost all cases. But why actually? After all, homeowners have to invest first of all for the power plant on the house roof: A solar system with five kilowatts of installed power including accessories costs around 10,000 euros. But the investment pays off in several ways - because on the one hand, solar power brings money from the state and, on the other hand, it saves costs for electricity from the supplier. Sunny prospects for owners of PV systems also in terms of return: According to a study by the htw University of Applied Sciences Berlin¹, a total return on investment of between 2.8 and 4.7 percent is assumed for PV systems. If homeowners rely on solar energy, they also make an important contribution to climate protection.

Feed in solar power and secure remuneration

Homeowners with their own solar system can either use “their” electricity themselves or feed it into the public grid. Both are worthwhile and are extremely straightforward. Because the part of the solar power that is not used automatically flows into the public power grid. House owners even receive a fixed purchase price per kilowatt hour (kWh), the so-called feed-in tariff, for a period of 20 years. The earlier a photovoltaic system is connected to the grid, the higher the remuneration. The subsidy rates decrease with the number of photovoltaic systems built - but this is offset by the fact that solar systems are also becoming cheaper and cheaper.

Use and benefit from solar power yourself

If homeowners want to become their own electricity supplier, they should use as much of the solar power as possible themselves. Self-consumption reduces the need for mains electricity and is particularly worthwhile. For comparison: mains electricity costs around 28 cents per kWh net, solar power from a 10-kilowatt system only costs around 10 to 12 cents per kWh.

In order to achieve a high level of self-consumption, PV system owners should use electricity if possible at noon, when the solar radiation is high. Because then the system delivers most of the electricity. If homeowners want to use green electricity around the clock, a solar power storage system is worthwhile - it stores the unused electricity from the midday for the time it is needed. This means that the self-consumption rate can almost be doubled.

Easy assembly for all roofs

Photovoltaic systems are therefore among the lowest-risk investments in the living area - and among the most climate-friendly. A solar system with an installed capacity of six kilowatts, for example, saves 2,900 kilograms of CO₂ annually, which corresponds to the output of around 240 trees. It also increases the value of your property. Another advantage: solar modules are suitable for almost all roofs facing south, west or east. The south orientation ensures the highest yields. Solar modules that face east or west deliver electricity in the morning and evening - exactly when the electricity demand at home is usually highest.

The assembly is also easier than expected, the system can be installed in one to two working days. It is important to note that the solar fitters have the appropriate qualifications.

1 htw University of Technology and Economics Berlin on behalf of the North Rhine-Westphalia consumer advice center: short study sensible dimensioning of photovoltaic systems for prosumers (March 2019)

Do you have any questions about purchasing and installing a photovoltaic system?

Find out more about the services and photovoltaic solutions from Stadtwerke München. Our staff will be happy to advise you.

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