1. What is a Solar Panel Energy Calculator?

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

Purpose: It helps homeowners and solar installers determine potential energy production from photovoltaic systems.

2. How Does the Calculator Work?

The calculator uses the formula:

Where:

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

Explanation: The panel's power is multiplied by sunlight hours and adjusted by the system's performance ratio to account for real-world inefficiencies.

3. Importance of Solar Energy Calculation

Details: Accurate energy production estimates help in system sizing, cost analysis, and return on investment calculations for solar installations.

4. Using the Calculator

Tips: Enter the panel power in kW, average daily sunlight hours (default 4.5), and performance ratio (default 0.75). All values must be > 0.

5. Frequently Asked Questions (FAQ)

Q1: What is a typical performance ratio?
A: Most systems have PR between 0.7-0.8, accounting for temperature effects, wiring losses, and inverter efficiency.

Q2: How do I find my daily sunlight hours?
A: Use solar maps or local meteorological data for your location's average peak sun hours.

Q3: Should I use panel nameplate rating or actual power?
A: Use the nameplate (STC) rating unless you have specific derating data for your conditions.

Q4: Does this account for seasonal variations?
A: No, this calculates daily output. Multiply by 30 for monthly estimates or use season-specific sun hours.

Q5: How accurate is this calculation?
A: It provides a reasonable estimate but actual output may vary due to weather, shading, and system-specific factors.