Solar carports provide both vehicle shelter and clean energy generation, making them an increasingly popular sustainable solution. But how much electricity can a solar carport actually produce? The key is understanding the basic power generation calculation.

Core Calculation Formula

The annual electricity generation of a solar carport can be estimated using the following formula:

Annual Energy Output (kWh) = Installed Capacity (kW) × Annual Peak Sun Hours (h) × System Efficiency

Key Variables Explained

1. Installed Capacity

Installed capacity depends on the available area for solar panel installation. Typically, each square meter can accommodate approximately 150–200 watts of photovoltaic (PV) modules.

For a standard parking space (approximately 12–15 m²), the installed capacity is usually around 2–3 kW.

2. Annual Peak Sun Hours

Solar irradiation varies significantly by region:

• Western China: approximately 1,600–2,000 hours/year
• North and East China: approximately 1,200–1,500 hours/year
• Southwest China: approximately 1,000–1,300 hours/year

Peak sun hour data can be obtained from local meteorological agencies or solar databases such as NASA's solar resource data.

3. System Efficiency

System efficiency accounts for factors such as:

• PV module degradation
• Inverter losses
• Cable losses
• Dust accumulation
• Temperature effects

In practice, overall system efficiency typically ranges between 75% and 85%. A conservative estimate is 80%.

Key Factors Affecting Power Generation

Geographic Location and Panel Orientation

In the Northern Hemisphere, solar panels achieve maximum output when facing due south with a tilt angle close to the local latitude. Since solar carports are often designed with flat or low-slope roofs, their generation efficiency may be slightly lower than the optimal configuration.

Shading

Shadows from nearby buildings, trees, or adjacent vehicles can significantly reduce energy production. Proper site planning should minimize shading throughout the day.

Temperature

Solar module efficiency decreases as temperature rises. Generally, output drops by approximately 0.3%–0.5% for every 1°C increase in panel temperature. Good ventilation beneath the carport canopy helps improve heat dissipation.

Cleanliness

Dust, bird droppings, snow, and other debris reduce light transmission and energy output. Regular cleaning can improve generation by 5%–15%.

Quick Calculation Example

Assume a solar carport project for 50 parking spaces in Eastern China:

• Total installation area: approximately 600 m²
• Installed capacity: approximately 100 kW
• Annual peak sun hours: 1,300 hours
• System efficiency: 80%

Annual electricity generation:

100 × 1,300 × 0.8 = 104,000 kWh

If the electricity price is RMB 0.6 per kWh, the annual electricity value would be approximately:

104,000 × 0.6 = RMB 62,400

Projects operating under a self-consumption with surplus power export model can often achieve even greater economic returns.

A Simple Rule of Thumb

For a quick estimate:

• 1 kW of solar capacity generates approximately 1,000–1,500 kWh per year under typical solar conditions.
• A standard parking-space solar system of about 3 kW can generate approximately 3,000–4,500 kWh annually.

This amount of electricity is sufficient to power an average electric vehicle for approximately 15,000–20,000 kilometers (9,300–12,400 miles) of driving each year.

Calculating the electricity output of a solar carport is straightforward once you understand the three key variables: installed capacity, peak sun hours, and system efficiency. For actual projects, professional site surveys and simulation analyses are recommended to obtain more accurate generation forecasts.

Whether for commercial facilities, industrial parks, educational campuses, or residential communities, a well-designed solar carport can provide shade and weather protection while transforming unused space into a long-term source of clean, renewable energy.