1. What is a Peak Sun Hours Calculator?

Definition: This calculator converts daily solar insolation (kWh/m²/day) into equivalent peak sun hours (PSH).

Purpose: It helps solar energy system designers and installers standardize solar radiation measurements for system sizing.

2. How Does the Calculator Work?

The calculator uses the formula:

Where:

• \( PSH \) — Peak Sun Hours (hours)
• \( \text{kWh/m²/day} \) — Total daily solar insolation

Explanation: Peak sun hours represent the equivalent number of hours at standard test conditions (1 kW/m²) that would produce the same total energy as the actual varying sunlight throughout the day.

3. Importance of Peak Sun Hours

Details: PSH simplifies solar radiation data for photovoltaic system design, allowing for easier comparison between locations and system performance calculations.

4. Using the Calculator

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

5. Frequently Asked Questions (FAQ)

Q1: What is solar insolation?
A: Solar insolation is the total solar energy received per unit area over a day, measured in kWh/m²/day.

Q2: Why use peak sun hours instead of raw insolation data?
A: PSH provides a more intuitive measure for system sizing, as PV panels are rated at standard test conditions (1 kW/m²).

Q3: What's a typical PSH value?
A: Most locations range from 3-6 PSH, with desert areas reaching up to 7 PSH and northern latitudes getting 2-4 PSH.

Q4: Where can I find insolation data for my location?
A: Use NASA's SSE database, PVWatts calculator, or local meteorological data sources.

Q5: Does this account for seasonal variations?
A: No, this calculates PSH for a single day's insolation. For system design, use monthly averages.