श्री PARVAT SOLAR ENERGY

Precision Engineered Solar Mounting Structures | Innovation · Strength · Reliability

⚡ ISO 9001:2025 Certified

🔧 Robust RCC & Sheet Metal Structures

💨 Wind load design up to 1.5 kN/m²

📐 Optimized tilt: 15°–30° or Latitude ±15°

📌 Design Fundamentals & Challenges

🏗️ Engineering Challenges

Holding panels at correct angle
Stability during strong winds & heavy rainfall
Long-term structural strength & safety
Access for cleaning & serviceability

🔩 Common Mounting Types

RCC rooftop structures
Sheet metal roof structures
Tilted frames for ground / flat roofs

✔️ Secure, durable PV mounting with dead, wind, snow, seismic load analysis

📐 Structural Calculation Methodology

ASCE 7-16 based design — ensuring structural stability, material strength, and site-specific tilt optimization.

📋 Calculation Steps

1. Design Parameters: Local wind speed, building height, terrain category (e.g. 39 m/s wind, 25-year life).
2. Wind Pressure: Compute Velocity Pressure (qh) and apply gust factor G → design pressure (1.0–1.5 kN/m²).
3. Member Loads: Distribution of wind, snow, dead loads across panels and purlins.
4. Load Combinations (ULS): 1.2D + 1.0W | 0.9D + 1.0W (uplift check).

🌬️ Wind Load Formula (ASCE 7-16)

p = qh · G · CN
Where:
G = Gust effect factor | CN = Net force coefficient (open monoplane roof)

qh = 0.00256 \cdot Kz \cdot Kzt \cdot Kd \cdot Ke \cdot V²

(V in mph, pressure in psf)

Total Joint Load = (Area Load × Panel Area) / Number of Joints

✔️ Load combinations include safety factors for ultimate & serviceability limits.

☀️ Optimal Tilt Angle Strategy

Maximize energy yield by aligning tilt angle with the sun’s path. The fundamental rule: Tilt Angle ≈ Latitude of your location.

📅 Seasonal Adjustment

Winter: Latitude +15°
Summer: Latitude –15°
Fixed tilt: Latitude ± 0° to 15° based on local conditions.

📍 Why latitude matters

The sun's apparent position depends on latitude; tilting panels to match your latitude aligns with the sun's average annual path, boosting generation by up to 15–25%.

📐 Optimal Range: Latitude ±15° | Typical fixed rooftop: 15° – 30°

🔩 Structural Member Specifications (Minimum Thickness & Sections)

Engineered for longevity, safety and wind stability as per Shree Parvat Solar Energy standards.

Component	Minimum Specification	Material / Section Details
⚙️ Base Plate	8 mm thickness	Hot-dipped / structural steel
📐 Column	2.6 mm (SHS/RHS) or 3 mm	Square hollow 50x50 min / Rectangular 60x40 min / 3mm alternative
🏗️ Rafter	2 mm (Lip section) / 3 mm (Channel)	Lip: web 80mm, flange 50mm min. Channel: 3mm thickness
📏 Purlin	2 mm (Lip section)	Web 80mm, flange 50mm minimum lip section
🔗 Front/Back Bracing	3 mm thickness	Robust diagonal bracing for lateral stability

🔩 Connection & Fasteners (Critical for durability)

✅ All connections fully bolted – no weak welded joints
✅ Leg to rafter connection: M12 minimum diameter bolt
✅ Rafter to purlin connection: M10 minimum diameter bolt
✅ Module mounting fasteners: SS-304 only (corrosion resistance)
✅ Remaining fasteners: SS-304 or HDG 8.8 Grade (high strength)

✔️ Compliant with wind zone & seismic category III

💨 Detailed Load & Pressure Insights

Velocity Pressure (qh) factors

Kz = velocity pressure coefficient (exposure & height)
Kzt = topographic factor
Kd = wind directionality factor
Ke = ground elevation factor
V = basic wind speed (mph)

Example design values

🌬️ Wind speed: 39 m/s (≈87 mph)
📐 Design pressure range: 1.0 – 1.5 kN/m²
🧮 Load combinations: 1.2D + 1.0W (downward), 0.9D + 1.0W (uplift)
🏔️ Terrain category C (open terrain) typical for rooftop solar.

📐 Quick Reference: Total wind load on structure = qh × G × CN × (tributary area). Design ensures safety against gust & suction effects.

🛡️ Long-term Strength & Serviceability

Shree Parvat Solar Energy's structural approach guarantees longevity under harsh conditions:

✔️ Corrosion-resistant galvanized/SS fasteners

✔️ Purlin-rafter moment connections

✔️ Easy access for cleaning & maintenance

✅ Minimum 25-year design life — all structural calculations include fatigue and seismic considerations based on site conditions.

🌍 Latitude-Based Tilt Guide (India Context)

。

City / Region	Latitude (°N)	Recommended Fixed Tilt	Winter optimum	Summer optimum
Mumbai	19.08	19°	34°	4°
Delhi	28.61	28°	43°	13°
Kolkata	22.57	22°	37°	7°
Bengaluru	12.97	13°	28°	-2° (≈5° min)
Ahmedabad	23.03	23°	38°	8°

⚙️ Adjust structure mounting legs to achieve optimal tilt while maintaining wind load resistance.

🏭 Shree Parvat Solar Energy — Structural Excellence

Each mounting structure is custom-engineered with advanced finite element analysis, ensuring robust performance under high wind zones, cyclonic regions, and heavy snow loads. Our design process follows IS 875-3, ASCE 7-16 and stringent quality checks.

⚡ #SolarWithStrength

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