1. What is a Solar Panel Power Generation Calculator?

Definition: This calculator estimates the daily energy output of solar panels based on their power rating, available sunlight hours, and system performance.

Purpose: It helps homeowners, solar installers, and energy professionals estimate solar panel productivity for planning and evaluation.

2. How Does the Calculator Work?

The calculator uses the formula:

Where:

• \( E \) — Energy generation (kWh)
• \( P \) — Panel power rating (kW)
• \( H \) — Daily sunlight hours (hours)
• \( PR \) — Performance ratio (decimal between 0 and 1)

Explanation: The panel's rated power is multiplied by sunlight hours and adjusted for real-world performance factors.

3. Importance of Solar Power Calculation

Details: Accurate energy production estimates are crucial for system sizing, financial analysis, and energy savings projections.

4. Using the Calculator

Tips: Enter the panel's rated power in kW, average daily sunlight hours, and performance ratio (default 0.75). All values must be > 0.

5. Frequently Asked Questions (FAQ)

Q1: What is the performance ratio?
A: It accounts for system losses (inverter efficiency, temperature, wiring, dirt) typically ranging 0.7-0.85.

Q2: How do I find daily sunlight hours?
A: Use solar irradiance data for your location, available from NASA or local weather stations.

Q3: Should I use panel nameplate rating or actual power?
A: Use the nameplate (STC) rating unless you have specific derating factors to apply.

Q4: Is this for daily or annual production?
A: This calculates daily production. Multiply by 365 for annual estimates (adjusting for seasonal variations).

Q5: Does this account for panel orientation?
A: No, adjust sunlight hours based on your panel's tilt and azimuth for more accuracy.