Ground Screws vs Helical Piles: How EPC Contractors Choose the Right Foundation for Solar Projects

EPC contractors often ask:

“Ground screws or helical piles — which should we use?”

The answer isn’t about which is better — it depends on site conditions, load requirements, and project constraints. Selecting the appropriate system affects installation speed, cost, and long-term stability. Understanding the differences between the two foundation types helps EPC teams plan more efficiently and avoid common pitfalls.

1. Understanding the Site Factors

Before comparing foundation systems, consider:

• Soil type: uniform, mixed, gravel, or rocky layers
• Load requirements: light solar structures vs heavy steel or industrial foundations
• Site accessibility: can large rigs or equipment reach the area?
• Project timeline: urgent vs flexible

These factors often determine the most suitable foundation type for a project, rather than the product alone.

2. Ground Screws: Fast, Efficient, and Reusable

Ground screws excel in flat land with uniform soil, especially for projects where speed and minimal disturbance are priorities.

Advantages:

• No concrete → zero curing time
• Fast installation → higher daily productivity
• Minimal site disturbance → suitable for sensitive environments
• Easy removal → reusable and sustainable

Best for: distributed solar, temporary or semi-permanent structures, fast-track projects.

3. Helical Piles: Reliable in Complex Soil

Helical piles provide stronger, deeper support where soil is mixed, rocky, or near bedrock. Their helix plates improve bearing capacity and settlement resistance.

Advantages:

• Higher load capacity
• Deeper penetration for stability
• Predictable performance via torque monitoring
• Reduced long-term settlement risk

Best for: uneven terrain, industrial foundations, high-load solar projects.

4. Torque Control: The Overlooked Key

Installation quality is critical. Even the best pile can underperform if torque isn’t controlled. Unstable torque can lead to:

• Inaccurate bearing capacity
• Uneven settlement
• Difficulty verifying design requirements

Tezhong solution: stable torque output, controlled rotation, and real-time monitoring to ensure every pile meets engineering specifications.

5. Cost Perspective: Short-Term vs Long-Term

• Ground screws save: installation time, labor, material → ideal for fast-track, budget-conscious projects
• Helical piles save: rework, structural risk, long-term maintenance → ideal for complex, high-value projects

Equipment also matters — reliable machines reduce errors, improve speed, and ensure consistent quality, especially on small- to mid-size EPC projects or sites with limited access.

6. Choosing the Right Foundation

Quick guide for EPC teams:

• Uniform soil + fast installation → Ground Screws
• Mixed soil + high load → Helical Piles

When in doubt, perform a test installation with torque measurement to confirm performance.

Tezhong recommends: assess soil, define load, test torque, select the right system, and use stable, controlled equipment. This ensures every pile delivers real-world reliability and project success.

👉 Contact Tezhong to discuss your solar project and optimize your foundation solution.