1. What is a Sun Calculator for Solar Panels?

Definition: This calculator estimates Peak Sun Hours (PSH) based on total solar insolation received at a location.

Purpose: It helps solar panel users and installers determine the equivalent hours of full sunlight available for energy production.

2. How Does the Calculator Work?

The calculator uses the formula:

Where:

• \( PSH \) — Peak Sun Hours (hours)
• \( Total\ Insolation \) — Total solar radiation received (Wh/m²/day)

Explanation: The total insolation is divided by 1000 W/m² (standard solar irradiance) to convert to equivalent hours of peak sunlight.

3. Importance of Peak Sun Hours Calculation

Details: PSH helps in sizing solar power systems accurately and estimating energy production potential at specific locations.

4. Using the Calculator

Tips: Enter the total insolation value in Wh/m²/day (available from solar maps or weather stations). Value must be > 0.

5. Frequently Asked Questions (FAQ)

Q1: What is considered a good PSH value?
A: Values above 4 PSH are considered good, while values below 3 PSH indicate lower solar potential.

Q2: Where can I find insolation data for my location?
A: NASA's POWER project, PVWatts calculator, or local meteorological stations provide this data.

Q3: Why divide by 1000?
A: 1000 W/m² is the standard test condition irradiance used for rating solar panels.

Q4: Does PSH vary throughout the year?
A: Yes, it varies seasonally due to sun angle changes and weather patterns.

Q5: How is this used in solar system design?
A: Multiply PSH by panel wattage to estimate daily energy production (kWh).