While the full standard is proprietary, official English translations and related guides are available:
The VDE-AR-N 4105 is published by the German Association of Electrical Engineers (VDE), an organization renowned for its contributions to standardizing electrical engineering and electronics. This standard serves as a detailed application rule for electrical installations, providing essential information on system design, component selection, and safety measures. vde-ar-n 4105 english pdf
It sets limits for harmonics and flicker to avoid interference with other grid-connected devices. Compliance and Certification While the full standard is proprietary, official English