Erdung PV-Anlage

A reliable earthing system is essential for effective lightning protection in PV installations. Various standards must be complied with, depending on whether there is a lightning protection system in place: In Germany, a foundation earth electrode complying to DIN 18014 must be installed for new builds with on-roof PV systems without a lightning protection system. 

In the case of on-roof PV systems with a lightning protection system, the requirements of VDE 0185-305-3 (IEC/ EN 62305-3) must be taken into account (earthing resistance < 10 Ohm). With free-standing PV systems, the requirements of VDE 0185-305-3 (IEC/EN) must also be taken into account. Here, a distinction between two earthing types must be made. 
 

Earthing systems, type A

Type A earthing systems include, for example, screw and ram foundations, if they correspond to the requirements of VDE 0185-561-2 (IEC/EN 62561-2).
Not only the minimum cross-section, but also the mechanical and electrical properties must be taken into account.

Earthing systems, type B

Plate and strip foundations are considered type B earthing systems. According to VDE 0185-305-3, Supplement Sheet 5, they have a reduced earth impact and should be expanded using additional earthing measures, such as grid earth electrodes or earth rods.

For both cases, the OBO portfolio offers matching earth rods with a diameter of 20 mm or 25 mm and wires with a diameter of 10 mm as well as strips of various dimensions, such as 30 x 3.5 mm or 40 x 4 mm.

Other solutions for the perfect earthing of photovoltaic systems include: