Procedure and device for diagnosing photovoltaic generators

摘要

Method for fault diagnosis of photovoltaic generators (PV) of a photovoltaic installation (PA), whereby the characteristic curves of the generators are monitored at regular time intervals to detect any unexpected discontinuities in the curves. A maintenance warning is generated if any curve exceeds a preset threshold line. Optimally a solar inverter can be used to carry out the method with existing semiconductor switches, and voltage and current sensors of the inverter used to measure the generator characteristic curves. An Independent claim is made for a solar inverter with a microcontroller that controls semiconductor switches so that at least a part of the characteristic curves of photovoltaic generators of a photovoltaic installation can be measured.