Definition
Pile foundations are the structural supports anchoring solar tracker and fixed-tilt racking to the ground. Driven steel H-beam or W-flange piles dominate; screw piles and concrete piers used in poor soil conditions.
Foundation Types
| Type | Soil Condition | Cost |
|---|---|---|
| Driven H-beam | Cohesive, sand | Baseline |
| Driven W-flange | Cohesive, sand | +5% |
| Helical screw | Sandy, gravel | +30% |
| Concrete pier | Rocky, unstable | +50–100% |
| Micropile | Very poor | +100%+ |
Key Takeaways
- Pile foundations support solar trackers and fixed-tilt arrays.
- Driven H-beam steel pile is the dominant type.
- Screw piles for sandy/rocky soil; concrete piers for unstable.
- Site-specific geotechnical investigation required.
- ASCE 7-22 and IS 800 govern structural design.
Frequently Asked Questions
4 commonly searched questions about Pile Foundation (Ground Mount).
What is a pile foundation?
Vertical structural element driven into the ground to support solar racking against vertical and lateral loads. Most common type: H-beam steel pile, driven 1.5–3.5 m into soil.
Foundation types for ground-mount?
Driven pile (most common), helical screw pile (rocky/sandy soil), concrete pier (unstable soil), micropile (very poor soil), ballast (rare for ground-mount).
How deep are piles driven?
1.5–4 m typical. Determined by geotech investigation, soil bearing capacity, and pull-out test. Higher tracker = deeper piles.
Geotech investigation needed?
Yes. Standard penetration test (SPT), borehole drilling, lateral load testing. Pre-construction site investigation typical 3–6 months.
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