Plug-in Solar Devices (Balcony Power Plants): Frequently Asked Questions (FAQ)

Plug-in solar devices can be connected to a household’s electrical circuit, provided that the applicable technical connection regulations—in particular VDE-AR-N 4105—are followed. The focus is always on safe and grid-compatible operation.

The registration process has also been significantly simplified: As a rule, registration in the Market Master Data Register is sufficient, while an additional notification to the grid operator has often been eliminated since 2024. At the same time, clear power limits of up to 2,000 W (DC) and 800 VA (AC) apply, within which simplified requirements take effect.

Another important aspect is the electricity meter: A bidirectional meter will be required in the future, though the meter operator will automatically replace it after registration in the Federal Network Agency’s Market Master Data Register.

Answers to these and many other questions regarding the operation, safety, and registration of plug-in solar devices can be found compiled at the following link:

The primary product standard is DIN VDE V 0126-95 (effective as of December 2025). It defines, for the first time, requirements for the safety, performance, and connection of such systems.

The linked FAQ (German) describes the process and some of the steps taken to develop the standard.

Plug-in solar devices allow you to generate your own electricity on a balcony, patio, or in the garden. However, to ensure safe and code-compliant operation, various technical and legal requirements must be observed. This guide (German) provides a concise overview of installation, connection, registration, and the relevant codes and standards. It offers interested readers reliable guidance on selecting and safely using plug-in solar devices.

Many people wonder whether a plug-in solar device that operates on the “plug it in and generate power” principle can be used with a standard household outlet. In fact, there are specific technical and safety requirements that apply to its connection.

You can find a comprehensive overview of these requirements, as well as further information on safe use and operation in accordance with standards, via the following link.

Do you want to ensure that your plug-in solar device meets all relevant requirements and can operate reliably? Then take advantage of our product testing and certification services. We help manufacturers and suppliers demonstrate compliance with applicable standards and grid requirements—from technical safety assessments to standards-compliant market launch. Learn more about your options and select the right service for your application directly on our website.