1. What is a Solar Panel Watts Calculator?

Definition: This calculator estimates the power output of solar panels based on their area, efficiency, local solar irradiation, and performance ratio.

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

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 per square meter)
• \( PR \) — Performance ratio (decimal, 0-1)

Explanation: The formula multiplies the panel area by its efficiency, local solar energy availability, and system performance factors.

3. Importance of Solar Power Calculation

Details: Accurate power estimation helps in 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's a typical solar panel efficiency?
A: Most commercial panels range from 15%-22% efficiency (0.15-0.22). Premium panels may reach 23-24%.

Q2: How do I find solar irradiation for my location?
A: Use solar maps or databases like NASA's or NREL's PVWatts calculator for local data.

Q3: What affects performance ratio?
A: Factors include temperature, shading, wiring losses, inverter efficiency, and soiling.

Q4: Can I calculate daily energy production?
A: Yes, multiply the result by peak sun hours in your location for watt-hours per day.

Q5: Does this account for panel orientation?
A: No, adjust the solar irradiation value based on your panel's tilt and azimuth angles.