We develop a web-based functionality check using measurement data from the solar controller. The goals are: assure an ideal system operation support service and trouble-shooting of solar thermal systems communicate and visualise the successful operation of the solar systems The function principle is quite simple: There exist solar controllers on the market that can measure and store all relevant system data. These data sets are uploaded periodically to a web portal where the intelligent

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... ality check is hosted. This web portal offers individual functions for system owners, service staff and manufacturers. It visualises the energy production of the system as well as the other measurement data sets. It performs a detailed operating analysis of solar circuit, storages, stagnation, pumps, volume flow and power. The results of these analyses are available for the service staff and give them significant hints for optimising and trouble-shooting the solar systems.