Marc Fengel's compact paperback deals with the testing of PV systems and storage systems in the context of initial and repeat tests, as well as the associated testing principles. In addition to the safety of installed and operated systems, it also addresses value retention, as systems require more maintenance as they age. Furthermore, insurance companies may require regular inspections, making careful documentation of all necessary and regular inspection work a must.

With regard to both initial and repeat inspections, the book covers

• which employees are eligible for inspection tasks,
• what special features need to be taken into account for PV systems on both the AC and DC sides,
• what needs to be taken into account when inspecting storage systems (including occupational safety measures),
• how proper documentation (inspection report) should be designed.

As additional practical support, it also contains a collection of typical inspection defects.