Knowledge Base

More and more households are asking whether a balcony power plant is worthwhile in addition to an existing PV system. In this comprehensive guide, you will learn how both systems can be combined, what advantages arise, and for whom this solution really pays off.

Balcony power plants, also known as mini solar systems or plug-in solar devices, have been enjoying growing popularity in Germany for several years. In view of rising energy prices and increasing environmental awareness, more and more households are looking for ways to generate their own electricity and thus become more independent. Mini solar systems offer an uncomplicated and comparatively inexpensive solution here. However, many interested parties first ask themselves the fundamental question: How much wattage can a balcony power plant actually have? The following article will not only answer this question based on the latest legal situation, but also comprehensively cover all other important aspects such as costs, subsidies, installation, legal framework, and insurance – practical, understandable, and up-to-date for 2026. How much wattage can a balcony power plant have? The 800-watt limit explained In Germany, the output of balcony power plants is clearly regulated. With the entry into force of the Solar Package I in May 2024, the conditions for private electricity producers were significantly simplified and improved. A balcony power plant may have a maximum inverter feed-in capacity of 800 watts (W). This limit refers to the maximum power that the inverter is allowed to feed into the domestic grid. It is crucial to distinguish between two values: Module power (Wp – Watt Peak): This is the rated power of the solar modules under standardized test conditions. Since Solar Package I, the modules of a balcony power plant may have a total output of up to 2,000 Wp. Inverter power (W): This is the actual output power that is fed into the grid. It is legally limited to 800 watts. A higher module output (e.g., 1200 Wp or more) with an 800 W inverter makes sense, as the modules rarely reach their maximum output. An "over-paneling" ensures that the 800-watt limit is reached faster and maintained longer, even on cloudy days or in the morning and evening hours, maximizing the total yield over the day. Why is there this limitation? The 800-watt power limit primarily serves grid safety and the protection of the household installation. Since balcony power plants are connected via a simple socket, overloading of the power lines is to be prevented and safe operation for all is to be ensured. New regulations through Solar Package I Solar Package I, passed in 2024, has revolutionized the operation of balcony power plants: Increase to 800 watts: The feed-in limit was increased from 600 W to 800 W. Simplified registration: Registration only needs to be done in the Market Master Data Register (MaStR) of the Federal Network Agency. The separate notification to the grid operator is no longer required. Toleration of old meters: Older, backward-running electricity meters (Ferraris meters) will be tolerated for a transitional period until the metering point operator replaces them. Schuko plug officially allowed: Connection via a conventional Schutzkontakt (Schuko) socket is now explicitly permitted according to VDE standard. What do balcony power plants cost with and without storage? The cost of a balcony power plant depends heavily on the equipment and quality. Basically, a distinction can be made between systems without storage and with a storage solution. Balcony power plant without storage A simple set, ideal for beginners, usually consists of one to two solar modules, an inverter, the mounting system, and the necessary cables. Costs: approx. €400 to €900This variant is the most common because of its low investment and quick amortization. Balcony power plant with storage A electricity storage system makes it possible to store energy generated during the day but not consumed, and then use it when the sun is not shining, e.g., in the evening hours. This maximizes self-consumption and independence from the grid. Costs: approx. €1,000 to €2,500 or more Is storage worthwhile? Storage is particularly worthwhile if electricity consumption mainly occurs in the evening or if maximum self-sufficiency is a priority. However, the higher investment significantly extends the amortization period. For many households, a system without storage is more economically viable, although storage can be retrofitted at any time. Where are there subsidies for balcony power plants? The funding landscape for balcony power plants in Germany is dynamic and strongly regional. Nationwide subsidies There is currently no direct nationwide funding. However, all buyers benefit from a crucial simplification: 0% VAT: Since 2023, VAT has been abolished on the purchase of photovoltaic systems and their components, which directly reduces the purchase price by 19%. Regional and municipal funding programs Many federal states, cities and municipalities offer their own funding programs to provide additional subsidies for the purchase. Grants: Often there are flat-rate grants between €100 and €500. Examples (as of early 2024/2025, subject to change): Mecklenburg-Vorpommern: Up to €500 subsidy (currently only for tenants). Berlin: offered up to €500 (programs are often quickly exhausted). Saxony: Flat rate of €300 per system. Many other cities such as Cologne, Düsseldorf, Stuttgart or Munich also have their own programs. Tip: Before purchasing, be sure to check your city or municipality's website with the search terms "balcony power plant subsidy [Your City]". Applications often have to be submitted before purchase. When is a balcony power plant worthwhile? The profitability of a balcony power plant depends on several factors. Economic efficiency and amortization period A typical 800W balcony power plant can generate approximately 600–900 kWh of electricity per year with good orientation. At an assumed electricity price of 35 cents/kWh, this results in annual savings of €210 to €315. Amortization period without storage: approx. 2–5 years Amortization period with storage: often 6–10 years or longer A balcony power plant is particularly worthwhile for: Good alignment: An unshaded south, southwest or southeast alignment is ideal. High base consumption during the day: Devices such as refrigerators, routers, standby devices or home offices ensure a constant electricity demand that is directly covered by solar power. Rising electricity prices: The more expensive grid electricity is, the faster the investment pays off. How to install and register a mini solar system? The installation and registration of a balcony power plant are easier than ever before thanks to the Solar Package I. Step-by-step installation guide Choose a location: Find a sunny spot on the balcony, terrace, facade, or in the garden. Fasten the mounting system: Mount the bracket securely and stably according to the instructions. Safety is the top priority. Attach solar modules: Attach the modules to the bracket. Wiring: Connect the modules to the inverter. Connection to the grid: Plug the Schuko plug of the inverter into a suitable outdoor socket. Simplified registration Registration is legally required but uncomplicated and free of charge. Only one registration: The balcony power plant only needs to be registered online in the Market Master Data Register (MaStR) of the Federal Network Agency. Deadline: Registration must take place within one month of commissioning. Required data: You will need, among other things, the commissioning date, the module and inverter power, and your meter number. What is permitted by law for balcony power plants? The legal framework has been significantly simplified, but there are still some important points to consider. Registration requirement As described above, only registration in the Market Master Data Register is required. The previous obligation to register with the grid operator has been dropped. Tenancy law and owners' associations (WEG) With the reform of the Condominium Act (WEG) and the German Civil Code (BGB), tenants and condominium owners have a right to approval of a balcony power plant. Tenants: The landlord can no longer refuse consent without good reason. Only compelling reasons (e.g., historic preservation, improper installation endangering the building structure) are permissible. It is still recommended to inform the landlord in advance. Condominium Owners: The installation of a balcony power plant is considered a "privileged measure." The homeowners' association can no longer simply block the installation. Technical Regulations and Safety Power Limits: 800 W inverter output and 2,000 Wp module output. Standards: Devices should comply with VDE standards, which ensures safety. Modern inverters have integrated grid and plant protection (NA protection), which immediately switches off the inverter if the plug is pulled or the power grid fails. FAQ – Frequently Asked Questions about Balcony Power Plants Here you will find answers to the most common questions about mini solar systems. Question Answer What happens to excess electricity? Electricity that is not consumed directly automatically and free of charge flows into the public grid and supplies other consumers in the neighborhood. There is generally no remuneration for this, as the effort for billing would be too high. The focus is on maximizing self-consumption. Do I need a new electricity meter? Not necessarily. Modern digital meters and smart meters are already suitable. Old, black Ferraris meters without reverse locks will be replaced free of charge by the metering point operator after registration. Thanks to Solar Package I, operation is temporarily permitted until replacement. To which phase do I need to connect the balcony power plant? This doesn't matter with modern, balancing electricity meters, which are standard in Germany. The meter offsets consumption and generation across all three phases (L1, L2, L3). You can therefore connect the system to any socket. Can I operate multiple balcony power plants? Only simplified registration for one system up to the 800-watt limit is possible per electricity meter (i.e., per apartment or house). Those who wish to install more power must follow the stricter rules for large PV systems, including installation by an electrician. What are the biggest disadvantages of a balcony power plant? The biggest disadvantages are the limited output, which can only cover a portion of the total consumption, and weather dependency. On cloudy days or in winter, the yield is significantly lower. Possible shading by trees or buildings can also significantly reduce performance. How safe is a balcony power plant? Very safe if certified components are used and the installation instructions are followed. VDE standards ensure that the devices pose no danger. The integrated NA protection in the inverter reliably prevents voltage from being present at the contacts when the plug is pulled. How do I insure my balcony power plant? As a rule, balcony power plants permanently attached to the building are covered by building insurance (for owners) or loosely installed systems are covered by household contents insurance (for tenants) against damages such as storms or hail. It is advisable to inform the insurer about the purchase. Damages to third parties (e.g., from a falling module) are covered by private liability insurance. Can I increase the power of my 600W inverter to 800W? Many 600W inverters purchased after 2023 are "update-ready." Manufacturers often offer a software update that allows the power to be legally increased to 800W once the system has been re-registered accordingly in the market master data register.

A Comprehensive FAQ Guide to Electricity Meters for Balcony Power Plants: Learn everything about legal requirements, meter types, costs, registration, and common mistakes – simply explained and up-to-date according to Solar Package I.

This comprehensive guide answers all important questions regarding the operation of a balcony power plant in relation to the electricity meter. It explains why electricity meters are not allowed to run backward, which meter types (digital meter, two-way meter) are required, and that the necessary meter replacement by the grid operator is generally free of charge. In addition, the risks of unregistered operation and the correct functioning for reducing electricity costs are explained in detail.

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A balcony power plant is a simple way to generate your own solar power and reduce electricity costs. In this article, you will learn how much power a mini PV system provides, what costs and savings are realistic, and what you should consider when it comes to installation, registration, and subsidies. Ideal for tenants and owners who want to use energy sustainably and independently.