1. Solar Street Light System Design Composition and Selection Standards

1. Core Component Configuration

2.Solar Street Light Key Design Parameter Calculations

1. Solar Street Lighting Demand Design

Formula:

PLED = E × A / (η × U × K)

• Parameter Explanation
  
• E: Design illuminance (Main roads 15-30 lx, Branch roads 10-20 lx)
  
• A: Illuminated area = Road width × Distance between lights
  
• η: Luminaire efficiency (0.8-0.9)
  
• U: Utilization factor (0.4-0.6)
  
• K: Maintenance factor (0.7-0.8)
  

Example: Road width 6m, distance between lights 25m, target illuminance 20 lx

→ PLED = 20 × (6 × 25) / (0.85 × 0.5 × 0.75) = 20 × 150 / 0.32 ≈ 94W

→ Choose a 100W LED module (Luminous flux 15,000 lm)

2. Solar Street Light Photovoltaic System Capacity Calculation

Steps:

1. Daily Consumption: Qday = PLED × Working Time (e.g.: 100W × 10h = 1000Wh)
   
2. PV Panel Power: PPV = Qday / (Hpeak × 0.7)
   
• Hpeak: Local average peak sunshine hours (e.g.: Beijing 4.5h)
  
• → PPV = 1000 / (4.5 × 0.7) = 317W → Choose 2 × 160W modules
  
3. Battery Capacity: C = Qday / (Vsys × DOD × 0.9)
   
• Vsys: System voltage (usually 12/24V)
  
• DOD: Depth of discharge (80% for lithium batteries)
  
• → C = 1000 / (24 × 0.8 × 0.9) = 57.6Ah → Choose 60Ah lithium battery
  

3. Solar Street Light Structural Design Specifications

1. Pole and Component Layout

Wind Resistance Design: Flange size ≥ pole diameter × 1.2 (e.g.: Pole diameter 76mm → Flange 200×200×10mm)

4. Solar Street Light Intelligent Control Strategy

1. Multi-Mode Operating Scheme

Backup Power: In areas with continuous rainy days ≥3days, configure a grid power complementary interface.

5. Installation and Maintenance Points

1. Construction Process

1. Environmental Assessment: Avoid tree/building shadows, obstruction < 2 hours on winter solstice.
   
2. Foundation Casting: Depth = Pole Height / 10 + 0.2m (e.g.: 6m pole → 0.8m deep).
   
3. Wiring Standards: Photovoltaic cable voltage drop ≤3%, Battery burial depth ≥0.5m.
   

2. Operation and Maintenance Cycle

6. Economic Analysis

1. Cost Comparison (based on 6m pole)

Payback Period:

Payback Period = (Price Difference / Annual Savings) = (12,000 – 8,000) / 600 ≈ 6.7 years

7. Typical Cases

Project Name: New Rural Road Lighting

Parameters Configuration:

• Road width 5m, staggered layout on both sides
  
• LED power 60W × 2, luminous flux 9,000 lm/unit
  
• Pv Panel 2 × 120W, battery 100Ah@24V
  

Performance Indicators:

• Average illuminance 18 lx, uniformity 0.48
  
• Continuous rainy backup 5 days
  
• Annual energy-saving rate 100%
  

8. Risk Control

1. Over-discharge Protection: Controller sets voltage ≥10.8V (12V system).
   
2. Theft Protection: Photovoltaic panel bolts use irregular structures, battery case welded and fixed.
   
3. Extreme Weather: Photovoltaic panels hail resistance level ≥ Class 3 (25mm hail impact).
   

Appendix: Recommended Design Verification Tools

1. PVsyst (Photovoltaic system simulation)
   
2. DIALux evo (Lighting simulation)
   
3. Meteorological data sources: NASA POWER / China Meteorological Administration Radiation Stations
   

Through this guide, a systematic approach can be achieved from illumination requirements to economic returns, realizing a low-carbon and highly reliable road lighting solution.

• Understanding Watts and Lumens: How to choose the right brightness
  
• What is Lux level? Determine the actual brightness of the luminaire
  
• Choosing the Right Color Temperature for Your Solar Street Light
  
• How to calculate the height and distance of solar street light?
  
• What battery is best for solar street lights?
  
• Using Dialux for Solar street light lighting calculation