ABSTRACT
Photovoltaic as well as solar thermal systems employed for the exploitation of solar energy are subject to the climatic effects of the given surroundings in a manner depending on the system in question. Most importantly, because of their frequently exposed location on roofs or as free-standing installations in unsheltered areas, these systems risk damage from direct or indirect lightning. Through measures for the protection against lightning and overvoltage, the planned operating times of the installed systems can be assured and economic expectations fulfilled. In this article, we explain the origin and possible effects of lightning. On the basis of existing standards and previous experience, we describe measures for lightning and overvoltage protection, and illustrate these measures by examples. The complete results of the studies on this topic are presented in a brochure available from the European Commission Directorate General for Energy and Transport or from the authors.
