Commisioning and preventive maintenance
Before commissioning and during repeat tests, a photovoltaic system must be checked and documented in accordance with DIN EN 62446 (VDE 0126-23).
Furthermore, electrical measurements are also useful after cleaning and maintenance work in order to continue to guarantee an optimal and low-loss function of the photovoltaic system.
The tests after maintenance or commissioning include the continuity test of the protective and equipotential bonding conductors between the PV generator and the main ground terminal, measurement of the open-circuit voltage and the short-circuit current in the PV string as well as the insulation resistance between the active DC conductors (+ / -) of the PV -Generator and earth.
The measuring devices used should have contact-protected measuring lines with standardized connectors for direct connection to PV modules or strings. Automatic test sequences should warn of incorrect DC polarity.Read more Read less