1. What is Sun Hours Calculation?

Sun hours represent the equivalent number of hours per day when solar irradiance averages 1 kW/m². It's calculated directly from insolation data (kWh/m²/day) and is crucial for sizing solar panel systems and estimating energy production.

2. How Does the Calculator Work?

The calculator uses the simple formula:

Where:

• \( Insolation Data \) — Solar irradiance measured in kWh/m²/day

Explanation: Since 1 kWh/m² represents 1 hour of peak sun (1 kW/m²), the insolation value directly equals the equivalent sun hours per day.

3. Importance of Sun Hours Calculation

Details: Accurate sun hours calculation is essential for proper solar system design, energy production estimation, and determining the optimal size and configuration of solar panels for specific locations.

4. Using the Calculator

Tips: Enter insolation data in kWh/m²/day. This data is typically available from meteorological sources or solar databases for your specific location.

5. Frequently Asked Questions (FAQ)

Q1: What is considered good sun hours for solar panels?
A: Generally, 4-6 sun hours per day is considered good, while 6+ is excellent for solar energy production.

Q2: How does season affect sun hours?
A: Sun hours vary significantly by season, with more hours in summer and fewer in winter. Annual averages are typically used for system sizing.

Q3: Where can I find insolation data for my location?
A: Many online resources provide insolation data, including NASA's Surface meteorology and Solar Energy database and various solar mapping tools.

Q4: How accurate is this calculation?
A: The calculation is mathematically precise, but the accuracy depends on the quality of the input insolation data for your specific location.

Q5: Can I use this for off-grid system design?
A: Yes, sun hours are fundamental for sizing both grid-tied and off-grid solar systems, helping determine energy production and storage requirements.