Solution
After a change in tracker racking vendors, Burns & McDonnell provided guidance as owner’s engineer on design options to mitigate the very real possibility of early failure of the solar module support system. Additional studies included a review of cathodic protection systems as well as various configurations for the rack system.
As owner’s engineer, design solutions were reviewed to assess effectiveness in mitigating early failure of the module tracker system. After reviewing options for cathodic protection — a technique in which corrosion of the metal surface is controlled by making it the cathode of an electrochemical cell — that approach was rejected due to high cost. The preferred solution was to fabricate the pile foundations with an additional sacrificial metal surface that could degrade over time while protecting the structural integrity of the inner metal posts.