Trigger block. String monitoring with Transclinic xi+. System for permanent performance monitoring of photovoltaic systems. The Transclinic xi+ device series continuously measures the current of individual strings or string groups as well as the voltage in a photovoltaic system, allowing for very detailed monitoring. Impairments that lead to yield reductions are promptly identified and can be addressed. PV-Plant: Smart software for data collection and monitoring of photovoltaic systems. The software consists of two program modules: The configuration module allows users to easily implement and organize the devices and system components to be monitored (device connection boxes, inverters, meters, weather sensors, etc.) as desired, including grouping or renaming them. Users can easily program email or SMS notifications to be automatically sent to a freely definable group in case of an alarm. Furthermore, the configuration module provides data for the online monitoring of the photovoltaic system. The visualization module allows for the direct display and storage of the online data sent to the PC. Detailed analyses of the current state of the photovoltaic system can be created through the graphical preparation of the data stored in the mySQL database. For email distribution, the data can also be exported in formats such as Excel or PDF. Additionally, there is a management system for alarms and their acknowledgments, ensuring that the agreed service actions are documented over time.