Marysville Solar Installation Case Study


Courtesy of Patriot Solar Group

Project Overview

  • Nova Consultants and Patriot’s engineering team began working together on the St. Clair RESA project in the Spring of 2013. The 514 kW array is one of a 12 MW portfolio for the midwest electric utility, DTE Electric Company.
  • Although site soil conditions were suitable for driven pier foundations, a ballasted racking design was chosen because of the well-head obstructions throughout the field.
  • Long term, the racking system can be disassembled and temporarily removed to service the well-head infrastructure during plant operation.

Project Objectives

  • Designed ballasted racking system to meet module height clearance of 4 feet above grade, a requirement of DTE.
  • Ballast design and racking configuration is aesthetically pleasing, at a cost competitive price.
  • Engineer post and truss equipment to allow +-4 inches of vertical adjustment in accordance with site grading plan.
  • Deliver racking material within a 6 week lead time.

Project Results

  • Racking design met the 4 foot height clearance in accordance with 90 MPH wind load and 35 PSF snow load.
  • Rail configuration was designed to meet panel strings of 12 and met all aesthetic project requirements.
  • Post vertical adjustment holes allowed in-field racking modification to maintain a level plain for module installation.
  • All racking material was delivered on schedule, allowing NOVA Consultants to meet project completion deadline.

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