We did a 112 kW system added to top level of almost new multi-story parking deck at a University. While we provided all solar design, we teamed with a structural engineering firm that provided all structural details to support the standard Unirack mounting racks. Since we were not allowed to take up any parking spaces with supports, each array row had to span over the up and down ramps in the center of this deck. This required free spans over 100 feet so structural steel was very large. Everything attached to existing concrete piers, but this required x-ray of piers to identify location of all internal rebar so mounting holes and bolts did not cut into these. The cost of the structural work was very high and I am glad we had a quality structural engineer on board.
Make sure to determine if client will allow array mounting structure supports to take up some parking spaces and if not, you better have a really big budget for the structural support system! Jeff Yago DTI Solar Inc.
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