I don't have a reference, I bought the measuring device because I saw it at a consumer protection organisation.

Good day I would be surprised if it can be used to measure the production of a PV system. The SEM5000 measures the energy consumed by a device at a 230V AC connection. In the PV system, direct current is generated and its voltage is measured at the output of the panels. Converting the SEM5000 will probably be a bigger challenge. Usually, the inverters connected to the PV system provide the information.