1. What is a Solar Panel Sizes and Wattage Calculator?

Definition: This calculator estimates the power output of solar panels based on their physical size, efficiency, local solar conditions, and system performance.

Purpose: It helps homeowners, engineers, and solar installers determine expected power generation from solar panel installations.

2. How Does the Calculator Work?

The calculator uses the formula:

Where:

• \( P \) — Power output (watts)
• \( A \) — Solar panel area (square meters)
• \( r \) — Panel efficiency (decimal, 0-1)
• \( H \) — Solar irradiation (watts/square meter)
• \( PR \) — Performance ratio (decimal, 0-1)

Explanation: The formula calculates theoretical power output by considering panel characteristics and environmental factors.

3. Importance of Solar Power Calculation

Details: Accurate power estimation ensures proper system sizing, energy production forecasting, and return on investment calculations.

4. Using the Calculator

Tips: Enter panel area in m², efficiency (default 0.18 for 18%), local solar irradiation (default 1000 W/m² for full sun), and performance ratio (default 0.75). All values must be > 0.

5. Frequently Asked Questions (FAQ)

Q1: What is solar irradiation?
A: It's the power per unit area received from the sun, typically about 1000 W/m² under ideal conditions.

Q2: What's a typical panel efficiency?
A: Most commercial panels are 15-20% efficient (0.15-0.20 in decimal form).

Q3: What affects performance ratio?
A: Factors like temperature, wiring losses, inverter efficiency, and soiling reduce performance from ideal conditions.

Q4: How do I find my local solar irradiation?
A: Use solar maps or databases like NASA's or NREL's for your specific location.

Q5: Can I calculate daily energy production?
A: Multiply the result by peak sun hours in your location (typically 3-6 hours/day).