‘We’re better off without standards’

Many factors are important in ballasting flat roof systems, such as wind speed and roof shape. In the past, however, wind force has unfortunately been underestimated, says wind expert Hans Ruscheweyh. pv magazine addressed this topic in a recent webinar with initiative partner Schletter, and drew several interesting points from the discussion.

Issue 04-2020

A 6.5 kW rooftop installation near Dieburg. The ballast required to keep a photovoltaic system in place depends not least on the distance of the array from the roof’s edge and the parapet.

Image: Maxsolar

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