1. What is a Home Solar Energy System Calculator?

Definition: This calculator estimates the size of solar panel system needed based on your annual electricity consumption and local sunlight conditions.

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

2. How Does the Calculator Work?

The calculator uses the formula:

Where:

• \( \text{Size} \) — Solar system size in kilowatts (kW)
• \( \text{Annual kWh} \) — Your yearly electricity consumption
• \( \text{Peak Hours} \) — Average daily peak sunlight hours in your location

Explanation: The formula divides your annual energy needs by the number of days and average sunlight hours to determine the required system output.

3. Importance of Proper Solar Sizing

Details: Correct system sizing ensures optimal energy production, maximizes return on investment, and prevents over- or under-sizing of your solar installation.

4. Using the Calculator

Tips: Enter your annual electricity usage in kWh (found on utility bills) and your location's average peak sun hours (default 4 hours). All values must be > 0.

5. Frequently Asked Questions (FAQ)

Q1: What are peak sun hours?
A: Peak sun hours represent the equivalent number of hours per day when solar irradiance averages 1,000 watts per square meter.

Q2: How do I find my annual kWh usage?
A: Check your electricity bills for the past year and sum the monthly kWh consumption.

Q3: What's a typical peak sun hours value?
A: Most locations range from 3-6 peak hours: 3-4 for northern regions, 4-5 for central, and 5-6 for southern/sunny areas.

Q4: Does this account for system inefficiencies?
A: No, consider adding 10-20% to the calculated size to account for real-world conditions and panel degradation.

Q5: How many solar panels is this?
A: Divide system size by panel wattage (e.g., 5kW system with 400W panels = 12-13 panels).