1. What is a Solar Energy Calculator?

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

Purpose: It helps homeowners and solar professionals estimate potential energy generation for planning and system sizing.

2. How Does the Calculator Work?

The calculator uses the formula:

Where:

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

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

3. Importance of Solar Energy Calculation

Details: Accurate energy estimates help determine system payback period, size systems correctly, and predict energy savings.

4. Using the Calculator

Tips: Enter 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 the performance ratio?
A: It accounts for system losses (inverter efficiency, wiring, temperature, etc.). 0.75 is typical for residential systems.

Q2: How do I find my sunlight hours?
A: Use solar irradiance maps for your location or consult local solar installers for accurate data.

Q3: Should I use panel nameplate rating or actual power?
A: Use the nameplate (STC) rating for initial estimates, though actual output may be 10-15% lower in real conditions.

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

Q5: How accurate is this calculation?
A: It provides a rough estimate. Professional solar assessments consider more factors like tilt, shading, and azimuth.