1. What is a Solar Panel Output Calculator?

Definition: This calculator estimates the actual power output of a solar panel based on its rated capacity and current sunlight conditions.

Purpose: It helps solar installers, homeowners, and energy professionals predict solar panel performance under various conditions.

2. How Does the Calculator Work?

The calculator uses the formula:

Where:

• Output — Actual power output (Watts)
• STC Wattage — Rated power under Standard Test Conditions (Watts)
• Irradiance — Current solar radiation (Watts per square meter)

Explanation: The formula adjusts the panel's rated output based on how much sunlight is actually available compared to the standard test condition of 1000 W/m².

3. Importance of Solar Output Calculation

Details: Accurate output estimation helps in system sizing, energy production forecasting, and financial analysis of solar investments.

4. Using the Calculator

Tips: Enter the panel's STC wattage (found on its label) and current irradiance (use 1000 for full sun, 500-800 for cloudy conditions). All values must be > 0.

5. Frequently Asked Questions (FAQ)

Q1: What are Standard Test Conditions (STC)?
A: STC are laboratory conditions (1000 W/m² irradiance, 25°C cell temperature) used to rate panel performance.

Q2: How do I measure irradiance?
A: Use a solar irradiance meter, or check local solar data from weather stations or monitoring systems.

Q3: Why divide irradiance by 1000?
A: This normalizes the current sunlight level to the STC reference value of 1000 W/m².

Q4: Does this account for temperature effects?
A: No, this is a basic calculation. For precise estimates, temperature coefficients should be considered.

Q5: What's typical irradiance on a sunny day?
A: Typically 800-1000 W/m² at solar noon, lower in morning/evening and during cloudy conditions.