Systems with an apparent power above 3.68 kVA must be capable of providing reactive power to stabilize local voltage levels.
Systems must be able to reduce power output if the grid frequency becomes too high, preventing a total grid collapse. Critical Versions and Updates VDE-AR-N 4105 Anwendungsregel:2018-11 - Standards vde-ar-n 4105 english pdf
The standard mandates several "grid-supporting" functionalities that systems must provide to stay connected: Systems with an apparent power above 3
For international manufacturers and installers, finding the is essential for ensuring that inverters and battery systems meet the strict safety and grid-stability requirements of the German market. What is VDE-AR-N 4105? What is VDE-AR-N 4105
VDE-AR-N 4105 is the critical German technical application rule for connecting decentralized power generation systems—most notably solar PV and energy storage—to the low-voltage distribution network.
Often referred to as the "Technical Connection Rule Low-Voltage," this standard ensures that the growing number of decentralized generators (like residential solar) do not negatively impact the power grid. It is part of a larger framework developed by the VDE Forum Network Technology/Network Operation (VDE FNN) to integrate renewable energy into the grid safely.