"Balcony solar power systems are generally permitted up to a capacity of 800 watts, with this limit referring to the maximum inverter output. Consumers must register their systems in the Federal Network Agency's market master data register. This registration is important to maintain an overview of installed solar energy and to ensure compliance with legal requirements."
" In many EU countries, balcony power plants are already permitted with higher power limits. Countries like the Netherlands , France , and Italy allow balcony power plants with a capacity of up to 2000 watts or even more. These countries have recognized that the integration of mini-PV systems plays a crucial role in achieving their climate goals. The Netherlands, in particular, actively promotes balcony power plants through tax breaks and financial incentives.
Another example is Austria , where the power limits are less strict, and systems with up to 800 watts per module are permitted. Consumers can install multiple modules, each with up to 800 watts. The total output of the solar system is therefore not as strictly limited as in Germany. For example, two 800-watt modules could be used, resulting in a potential total output of 1600 watts . In combination with a suitable inverter, more electricity could be used or fed into the grid. Here, too, simplified registration procedures and regional subsidies support the use of solar power. "
https://www.moe-balkonkraftwerk.de/en/blogs/news/balkonkraft...