What is Ground-Mount Solar Racking?

Ground-mount solar racking refers to the structural systems used to support photovoltaic modules on the ground, rather than on rooftops. These systems are the backbone of utility-scale solar farms, agrivoltaics, and large commercial ground-mount installations. Unlike rooftop systems, ground-mount racks must be engineered to withstand higher wind loads, accommodate varied terrain, and integrate with diverse foundation types while providing optimal tilt angles for maximum energy production.

Ground-mount systems typically consist of steel or aluminum support structures, foundations (concrete piles, screw piles, driven piles), and mounting hardware that secures modules at fixed or adjustable angles—or in the case of trackers, angles that follow the sun throughout the day.

Main Types of Ground-Mount Racking

Core Components

Material Selection

Corrosion Protection:

Foundation Options

2024-2025 Technology Trends

1. High-Strength Steel Adoption

The use of Q355B and S420GD grades has increased significantly, allowing for thinner sections and 20-30% less steel compared to traditional Q235B designs. This reduces material costs and transportation weight while maintaining structural integrity.

2. Zn-Al-Mg Coated Steel Mainstream

Zinc-aluminum-magnesium (Zn-Al-Mg) coated steel has become the standard for high-corrosion environments. With 5-10 times the corrosion resistance of traditional hot-dip galvanizing and self-healing properties at cut edges, Zn-Al-Mg extends service life to 35+ years.

3. Large-Span Designs for Agrivoltaics

As agrivoltaics expands, steel racks with spans of 8-12 meters and column heights of 3-4 meters have become standard. These designs accommodate standard farming equipment while maintaining generation capacity. Single-pole racking systems minimize land occupation and reduce interference with crop growth.

4. Screw Pile Integration

Steel racks are increasingly designed with integrated screw pile interfaces, eliminating the need for concrete foundations. Next-generation systems achieve 50% steel savings and 70% depth reduction compared to conventional pile foundations, with installation times of 2-3 minutes per pile.

5. Prefabricated and Modular Systems

Factory pre-assembled rack sections reduce on-site labor by 30-50%. Pre-punched holes, pre-cut lengths, and pre-installed connection hardware simplify field assembly and improve quality consistency.

6. Terrain-Following Designs

For mountainous and reclaimed land sites, articulated rack systems with ±15° to ±20° tilt compensation eliminate the need for extensive grading, preserving topsoil and reducing environmental impact. These systems are increasingly used in coal mining subsidence areas and other disturbed lands.

7. Material Innovations

Baosteel Danxia Steel: High-strength weathering steel specifically developed for PV mounts, achieving monthly orders of 12,000 tonnes in mid-2024. Over 45,000 tonnes supplied for 1.5 GW of PV projects across diverse terrains.

Shangang Group: Developed new high-strength steel for PV mounting structures in late 2024, meeting stringent load and corrosion requirements.

8. Standardization

The YB/T “Photovoltaic Mounting Steel Sections” industry standard was reviewed in November 2024, specifying structural types, chemical composition, mechanical properties, and anti-corrosion requirements for C-channel, angle steel, and H-beam sections used in PV mounts.

Engineering Considerations

Load Design:

Corrosion Environment Classification:

Application Examples

Example 1: Large-Scale Fixed-Tilt Plant (100 MW)

Location: Flat terrain, moderate wind zone

Structure: Q355B C-channel, 25° fixed tilt

Foundation: Driven piles, 2.5 m depth

Coating: Hot-dip galvanized, 85 μm

Result: 25-year design life, 60 m/s wind resistance

Example 2: Agrivoltaics Project (10 MW)

Location: Rolling farmland, high snow load

Structure: Q355B large-span H-beams, 3.5 m height

Span: 10 m between columns

Foundation: Screw piles, double-helix

Result: Farming equipment access maintained, 30-year service life

Example 3: Tracker System (50 MW)

Location: High-irradiation region, moderate terrain

Structure: Q355B torque tubes + C-channel purlins

Drive: Single-axis, 60° tracking range

Foundation: Precast concrete piles

Result: 18-22% generation gain over fixed-tilt

Comparison: Steel vs. Aluminum Ground Mounts

Production Capacity & Industry Developments

Inner Mongolia Energy Group: Commissioned a fully automatic PV mount production line in February 2024 with a design capacity of 100,000 tonnes/year (sufficient for 3.5 GW of PV plants). From equipment arrival to commissioning took only 12 days.

Global Market: The ground-mount solar racking market continues to expand, with fixed-tilt systems dominating large-scale projects while tracking systems gain share in high-irradiation regions. Emerging markets in the Middle East, Southeast Asia, and Latin America are driving growth.

In a Nutshell

Ground-mount solar racking is the structural foundation of utility-scale PV. Key developments in 2024-2025 include:

High-strength steel (Q355B, S420GD) reducing material consumption by 20-30%

Zn-Al-Mg coated steel offering 35-year corrosion protection with self-healing properties

Large-span designs (8-12 m) enabling agrivoltaics and equipment access

Screw pile integration eliminating concrete and accelerating installation

Prefabricated systems reducing on-site labor by 30-50%

Terrain-following designs preserving topsoil on challenging sites

For large-scale projects requiring durability, cost control, and long-term reliability, steel ground-mount systems remain the industry standard. The choice of foundation type—screw piles, driven piles, or concrete—depends on soil conditions, project scale, and environmental requirements.