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Solar farm construction requires three instrument types: a GPS rover (Trimble R12i) for high-speed pile layout across large open sites, a grade laser (Leica Rugby 840) for drainage grading and pad elevation control, and a robotic total station (Topcon GT-1200) for pile top elevation and plumb as-built verification. Most solar EPC contractors deploy all three on utility-scale projects.
Utility-scale solar farm construction involves thousands of pile positions, extensive site grading for drainage, and precise pile top elevation control for solar tracker mounting. Survey needs span pile layout, grading verification, and as-built documentation — often simultaneously across a site measured in hundreds of acres. The right equipment suite covers all three workflows efficiently, enabling the production pace required to meet solar project schedules.
Grade laser or GPS machine control establishes drainage slopes across the solar array area. Drainage design for large solar sites follows natural contours modified for panel row drainage. Grade control accuracy must meet stormwater design requirements.
GPS rover lays out thousands of pile positions from a design grid. Each pile location is staked or marked with paint before pile driving begins. Accuracy requirements are typically ±50mm plan for most tracker systems, ±25mm for tight-tolerance trackers.
Total station or GPS verifies pile top elevations and plumb before tracker mounting. Out-of-tolerance piles are corrected before tracker installation. As-built documentation is submitted to the EPC and owner for project closeout.
The most efficient instrument for solar pile layout. A single operator with the R12i can lay out thousands of pile positions per day across an open solar site — IMU tilt compensation eliminates pole leveling, and Trimble Siteworks reads pile position grids directly from the design file.
Best instrument for pile top elevation and plumb verification on solar projects where precise as-built data is required for tracker mounting. Robotic operation allows one-person verification across all pile tops efficiently.
Solar farm grading requires precise drainage slope control across large open sites. The Leica Rugby 840 dual-grade laser provides the reference plane for grading crews and machine control receivers to verify stormwater drainage slopes across the panel array area.
Sitemark is used on utility-scale solar projects to document pile top elevations, verify pile position as-built data, and generate owner-required as-built reports. Use the pile elevation calculator to verify pile top elevations against tracker mounting requirements, and log as-built data in Sitemark for project closeout.
How solar EPC crews use Sitemark to document survey and installation work.
Solar farm construction requires three instrument types: a GPS rover for pile layout, a grade laser or GPS grade control for site grading, and a robotic total station or GPS for pile top as-built verification. The Trimble R12i covers pile layout, the Leica Rugby 840 handles grading, and the Topcon GT-1200 handles as-built.
Solar pile layout typically requires ±25–50mm plan accuracy. RTK GPS rovers provide ±8mm + 1ppm, which comfortably meets standard solar tracker mounting tolerances. Verify project-specific EPC specifications — some tracker systems specify tighter positioning requirements.
A skilled operator with a GPS rover and tilt compensation (Trimble R12i or similar) can lay out 500–1500 pile positions per day on an open solar site, depending on site conditions, design file organization, and pile spacing. Production drops with rough terrain, long transit distances between rows, or complex tracker row geometry.