Solar Irradiance Calculator By Location

Solar Irradiance Estimation:

\[ GHI = \text{Location-based solar irradiance estimation using PVWatts model} \]

Latitude:

degrees

Longitude:

degrees

Month:

Panel Tilt Angle:

degrees

Estimated Global Horizontal Irradiance (GHI):

Unit Converter ▲

Unit Converter ▼

From:	To:

1. What Is Solar Irradiance?

Solar irradiance is the power per unit area received from the Sun in the form of electromagnetic radiation. Global Horizontal Irradiance (GHI) is the total amount of shortwave radiation received from above by a surface horizontal to the ground.

2. How Does The Calculator Work?

The calculator estimates solar irradiance using location-based parameters:

\[ GHI = \text{Base Value} \times \text{Latitude Factor} \times \text{Seasonal Factor} \times \text{Tilt Factor} \]

Where:

Base Value — Standard irradiance reference value
Latitude Factor — Adjustment for distance from equator
Seasonal Factor — Adjustment for time of year
Tilt Factor — Adjustment for panel orientation

Explanation: The calculation approximates the PVWatts model, which uses sophisticated algorithms to estimate solar radiation based on geographical location and time of year.

3. Importance Of Solar Irradiance Calculation

Details: Accurate solar irradiance estimation is crucial for solar energy system design, predicting energy production, optimizing panel placement, and calculating return on investment for solar projects.

4. Using The Calculator

Tips: Enter latitude (-90 to 90), longitude (-180 to 180), select month, and specify panel tilt angle (0-90 degrees). For best results, use precise coordinates and consider local weather patterns.

5. Frequently Asked Questions (FAQ)

Q1: What is the difference between GHI and DNI?
A: GHI (Global Horizontal Irradiance) includes both direct and diffuse radiation, while DNI (Direct Normal Irradiance) measures only direct sunlight striking a surface perpendicular to the sun's rays.

Q2: How accurate is this calculator?
A: This provides an estimation. For precise measurements, consult specialized solar databases or use professional solar assessment tools that incorporate historical weather data.

Q3: Why does tilt angle affect irradiance?
A: The optimal tilt angle maximizes exposure to direct sunlight. The ideal angle varies by location and season, generally equal to the latitude for year-round performance.

Q4: What time of day does this calculate?
A: This estimates average daily irradiance. Actual irradiance varies throughout the day, peaking at solar noon when the sun is highest in the sky.

Q5: Can I use this for commercial solar projects?
A: While useful for preliminary estimates, commercial projects should use professional solar assessment tools and consult meteorological data for accurate predictions.