Solar Tracker
A solar tracker is a motorized mounting system that rotates PV modules throughout the day to follow the sun's position, increasing energy yield compared to a fixed-tilt array. Single-axis trackers rotate on one axis and are the standard for ground-mount projects; dual-axis trackers follow both azimuth and elevation for maximum output.
A solar tracker is a motorized racking system that continuously reorients PV modules toward the sun as it moves across the sky. Instead of absorbing sunlight at an angle for most of the day, a tracked array keeps each module closer to perpendicular to incoming irradiance, converting more photons into electricity across the full day.
Single-axis trackers (SAT) rotate panels from east to west on a horizontal or tilted axis, following the sun's daily arc. They are the dominant tracker type in utility-scale and large commercial ground-mount PV because they offer the best balance of yield gain, mechanical simplicity, and cost. At low sun angles in the morning and evening, backtracking algorithms tilt the rows away from the optimal sun angle to prevent one row from casting shade on the next.
Dual-axis trackers add a second degree of motion, adjusting both azimuth (east-west) and elevation (seasonal tilt), so modules stay nearly perpendicular to the sun at all times. The additional yield over single-axis is relatively modest for flat-plate PV and rarely justifies the extra cost and maintenance burden in standard installations.
Why it matters for solar installers
Tracker projects demand more precise design than fixed-tilt arrays. Inter-row spacing, backtracking parameters, and bifacial rear-side exposure all feed into the yield model, and errors compound across large sites. solarVis' 3D design engine models tracker geometry, row spacing, and shading interactions so the energy production figure in your proposal reflects the actual tracked layout, not a fixed-tilt approximation.
Common questions
- How much more energy does a solar tracker produce compared to fixed tilt?
- Single-axis trackers typically increase annual yield by 15 to 25 percent over a fixed-tilt array at the same site. Dual-axis trackers can add a further 5 to 10 percent on top of that, though the additional mechanical complexity usually makes them cost-effective only for concentrated solar applications rather than standard PV.
- Are solar trackers worth it for commercial and utility ground-mount projects?
- For utility-scale and large commercial ground-mount projects, single-axis trackers are now the default choice in most markets because the yield gain outweighs the added cost. For rooftop and small commercial installations, fixed-tilt or ballasted racking is almost always the better option: the structural and maintenance overhead of a tracker rarely pays back on a constrained rooftop.
- What design considerations change when a ground-mount array uses trackers?
- Inter-row spacing increases because tracker rows need clearance to tilt without shading each other. Backtracking algorithms prevent row-to-row shading at low sun angles. These factors must be modeled explicitly in your feasibility and design software to get accurate yield estimates.
