Proposed 75 KW Off Grid Varisun Direct Solar Pumping System

Project Details

This project involves the structural analysis and design of a 75 kW off-grid solar pumping system developed for River Dog Farm. The scope required high-performance engineering solutions for ground-mount solar racking, integrating a framework of cold-formed steel CEE and ZEE sections. These structures are supported by a foundation system of 40 helical screw anchors, specifically designed to meet stability requirements and pull-force demands in an agricultural setting.

The design process included a rigorous assessment of environmental loads to ensure the system’s performance under Seismic Design Category D and ultimate wind speeds of 93 MPH. All structural components were engineered in accordance with the 2022 California Building Code (CBC) and ASCE 7-22 seismic and wind provisions, prioritizing safety, durability, and serviceability. Special attention was dedicated to wind uplift resistance, lateral restraint, and precision connection detailing to ensure the overall resilience of the solar array against significant environmental forces.

Role

Structural Engineer/Designer

Services Provided

The scope includes preparation of structural calculations and supporting markup drawings, as required. Calculations shall cover wind, seismic, dead, live, and module loads, including uplift, sliding, and overturning checks for racking and piles. The structural analysis and design will address all primary elements, including screw/helical piles, post hubs, posts, rails, braces, anchorages, and connections, along with foundation capacity verification based on geotechnical parameters and manufacturer test data. Serviceability checks for deflection, vibration, and differential racking movements under wind gusts will be performed. Grounding and bonding notes for structural steel components will be provided in coordination with the NEC scope (by others).