What Is a Solar Ground Foundation?
Ground foundations — also called ground piles or column posts — are the steel elements driven or embedded into the soil to anchor the entire solar mounting structure. They transfer all vertical dead loads (panel + racking weight) and lateral dynamic loads (wind, seismic) from the structure down into stable ground.
Getting the pile type wrong at this stage creates structural risk and delays. Winture's engineering team reviews geotechnical data alongside project specs to recommend the right pile type, embedment depth, and galvanizing grade before fabrication begins — at no additional charge.
All Winture ground foundation products undergo systematic laboratory testing — from incoming raw material coils through to finished galvanized sections.
Key tests include: chemical composition (OES spectrometer), mechanical properties (yield strength, tensile strength, elongation), coating thickness measurement, adhesion verification, and salt spray resistance.
Explore our ISO-certified Lab
How to Choose the Right Pile Type
|
Pile Type
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Best Soil Conditions
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Typical Bearing Capacity
|
Installation Method
|
Concrete Required?
|
|
C-Beam
|
Clay, sand, loam
|
250kN
|
Embedded or bolt-connected
|
Optional
|
|
H-Beam
|
Rock, hard soil, compact loam
|
2100kN
|
Embedded with concrete pouring
|
Yes
|
|
Screw Pile
|
Clay, sand, loam, soft ground
|
>80 kN (soil-dependent)
|
Mechanically screwed in
|
No
|
Screw pile advantage:
No concrete curing time means installation proceeds immediately — a critical advantage on large utility-scale projects where pile driving and racking erection run in parallel.
Foundation Specification Parameters
|
Parameter
|
C-Beam Foundation
|
H-Beam Foundation
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Screw Pile Foundation
|
|
Material
|
Q355B/Q420B Steel
|
ASTM A36, ASTM A572, EN 10025
|
Q355B/Q420B Steel
|
|
Anti-Corrosion Treatment
|
Hot-Dip Galvanizing＞85um (ISO 1461)
|
Hot-Dip Galvanizing＞85um (ISO 1461)
|
Hot-Dip Galvanizing＞85um (ISO1461)
|
|
Section/Specification
|
Customizable
|
ASTM A6/A6M or EN10034
|
Customizable
|
|
Bearing Capacity
|
＞50 kN
|
＞100kN
|
＞80 kN (soil-dependent)
|
|
Applicable Soil
|
Clay, sand, loam
|
Rock, hard soil, loam
|
Clay, sand, loam, soft soil
|
|
Installation Method
|
Embedded / bolt connection
|
Embedded with concrete
|
Screw-in, no concrete
|
|
Service Life
|
＞25 years
|
＞25 years
|
＞25 years
|
Typical H-Beam Specifications for Solar Tracker Projects (ASTM Standard)
The following H-beam dimensions are commonly specified in utility-scale solar tracker projects per ASTM standards.
All sections are in-house fabricable; non-standard sections available upon request.
|
|
|
|
Height (mm)
|
Width (mm)
|
Web thickness (mm)
|
Flange thickness (mm)
|
Theoretic weight (kg/m)
|
|
W4
|
100×100
|
W4×13
|
106
|
103
|
7.1
|
8.8
|
19.3
|
|
W5
|
130×130
|
W5×16
|
127
|
127
|
6.1
|
9.1
|
23.8
|
|
W5
|
130×130
|
W5×19
|
131
|
128
|
6.9
|
10.9
|
28.1
|
|
W6
|
147×100
|
W6×7
|
147
|
100
|
3.3
|
4.2
|
14.0
|
|
W6
|
150×100
|
W6×8.5
|
148
|
100
|
4.3
|
4.9
|
13.0
|
|
W6
|
150×100
|
W6×9
|
150
|
100
|
4.3
|
5.5
|
13.5
|
|
W6
|
150×100
|
W6×12
|
153
|
102
|
5.8
|
7.1
|
18.0
|
|
W6
|
150×100
|
W6×16
|
160
|
102
|
6.6
|
10.3
|
24.0
|
|
W6
|
150×150
|
W6×15
|
152
|
152
|
5.8
|
6.6
|
22.5
|
|
W6
|
150×150
|
W6×20
|
157
|
153
|
6.6
|
9.3
|
29.8
|
|
W6
|
150×150
|
W6×25
|
162
|
154
|
8.1
|
11.6
|
37.1
|
|
W8
|
200×100
|
W8×10
|
200
|
100
|
4.3
|
5.2
|
15.0
|
|
W8
|
200×100
|
W8×13
|
203
|
102
|
5.8
|
6.5
|
19.3
|
|
W8
|
200×100
|
W8×15
|
206
|
102
|
6.2
|
8
|
22.5
|
|
W8
|
200×135
|
W8×14
|
203
|
134
|
5.0
|
6.4
|
21.4
|
|
W8
|
200×135
|
W8×18
|
207
|
133
|
5.8
|
8.4
|
26.6
|
|
W8
|
200×135
|
W8×21
|
210
|
134
|
6.4
|
10.2
|
31.3
|
|
W8
|
200×165
|
W8×24
|
201
|
165
|
6.2
|
10.2
|
35.9
|
|
W8
|
200×165
|
W8×28
|
205
|
166
|
7.2
|
11.8
|
41.7
|
|
W8
|
200×200
|
W8×31
|
203
|
203
|
7.2
|
11
|
46.1
|
|
W8
|
200×200
|
W8×35
|
206
|
204
|
7.9
|
12.6
|
52.0
|
|
W8
|
200×200
|
W8×40
|
210
|
205
|
9.1
|
14.2
|
59.0
|
|
W8
|
200×200
|
W8×48
|
216
|
206
|
10.2
|
17.4
|
71.0
|
|
W8
|
200×200
|
W8×58
|
222
|
209
|
13
|
20.6
|
86.0
|
|
W8
|
200×200
|
W8×67
|
229
|
210
|
14.5
|
23.7
|
100.0
|
Download Full H‑Beam Specification Table↓
Product Quality Warranty:
15 years for all types of solar ground foundations, covering material defects and structural failure under normal installation and operating conditions (excluding damage caused by improper installation, abnormal external forces, soil settlement from external factors, or natural disasters).
Coating Warranty:
25 years for hot-dip galvanizing coating against obvious corrosion, peeling, or rust under normal use conditions.
Environmental Durability — Additional Reference:
For projects in highly corrosive environments, upgraded coating specifications are available. Contact our technical team for site-specific ecommendations.
All Winture ground foundation products undergo systematic laboratory testing — from incoming raw material coils through to finished galvanized sections.
Key tests include: chemical composition (OES spectrometer), mechanical properties (yield strength, tensile strength, elongation), coating thickness measurement, adhesion verification, and salt spray resistance.
Bundling
Components of the same type and section are bundled with galvanized steel strip banding, grouped by profile type and length for on-site sequence installation.
Color-coded bundle labels
Each bundle is labeled with installation zone code, profile type, and sequence number —matching the project BOM and installation drawing, minimizing on-site sorting on large farmland projects.
Pallet packaging
Bundled components palletized and stretch-wrapped for container stability.
Labeling
Every package is labeled with product name, section designation, quantity, weight, batch number, and destination.
Container loading
Engineered for standard 20ft and 40ft containers; loading plans provided with each shipment.
Every agrivoltaic structure component passes Winture's full-cycle PDCA quality loop:
Click through each stage to see the specific inspection parameters and acceptance criteria applied at IQC, IPQC, FQC, and OQC.
Winture holds ISO 9001, ISO 14001, and ISO 45001 certifications. Our solar mounting structure production equipment includes:
Equipment:
| Equipment |
Quantity |
Function |
SOP |
| Slicing Machines |
2 sets |
Coil slitting to production width |
|
| Forming Machines |
15 sets |
Cold roll forming of C/U/O profiles |
|
| Punching Machines |
19 sets |
CNC bolt hole punching |
|
| Stamping Machines |
17 sets |
End stamping, bracket forming |
|
| Hot-Dip Galvanizing Lines |
2 sets |
Shared with tower line |
|
30,000 MT Monthly production capacity
Explore full manufacturing capabilities
Why Choose Winture for Solar Ground Foundations?
All Winture ground foundation products undergo systematic laboratory testing — from incoming raw material coils through to finished galvanized sections.
Key tests include: chemical composition (OES spectrometer), mechanical properties (yield strength, tensile strength, elongation), coating thickness measurement, adhesion verification, and salt spray resistance.
