1. What is a Solar Panel Calculator for Home Energy?

Definition: This calculator estimates the required solar panel system size based on your annual energy consumption, peak sunlight hours, and system efficiency.

Purpose: It helps homeowners determine the appropriate solar panel capacity needed to meet their energy needs.

2. How Does the Calculator Work?

The calculator uses the formula:

Where:

• \( \text{Size} \) — Required solar panel system size (kilowatts)
• \( \text{Annual kWh} \) — Your yearly electricity consumption (kilowatt-hours)
• \( \text{Peak Hours} \) — Average daily peak sunlight hours (typically 4-5 hours)
• \( \text{Efficiency} \) — System efficiency factor (typically 0.75-0.85)

Explanation: The formula divides your annual energy needs by the expected daily solar production, accounting for system losses.

3. Importance of Solar Panel Sizing

Details: Proper sizing ensures your solar system meets your energy needs while maximizing return on investment and avoiding over- or under-sizing.

4. Using the Calculator

Tips: Enter your annual kWh usage (from utility bills), local peak sun hours (default 4.5), and system efficiency (default 0.75). All values must be > 0.

5. Frequently Asked Questions (FAQ)

Q1: How do I find my annual kWh usage?
A: Check your electricity bills for yearly consumption or multiply monthly average by 12.

Q2: What are typical peak sun hours?
A: Most locations get 4-5 peak sun hours daily. Southern areas may get more, northern areas less.

Q3: What affects system efficiency?
A: Factors include panel orientation, shading, temperature, wiring losses, and inverter efficiency.

Q4: Should I round up the calculated size?
A: Yes, solar systems come in standard sizes, so round up to the nearest available system size.

Q5: Does this include battery storage?
A: No, this calculates grid-tied systems. Add 20-30% more capacity if including battery storage.