1. What is a Home Solar System Size Calculator?

Definition: This calculator estimates the size of a solar panel system needed based on your annual electricity consumption and peak sun hours.

Purpose: It helps homeowners and solar installers determine the appropriate solar system size for meeting energy needs.

2. How Does the Calculator Work?

The calculator uses the formula:

Where:

• \( \text{Size} \) — Solar system size (kilowatts)
• \( \text{Annual kWh} \) — Yearly electricity consumption (kilowatt-hours)
• \( \text{Peak Hours} \) — Average daily peak sun hours (default 4.5 hours)

Explanation: The annual consumption is divided by the total annual peak sun hours to determine the required system capacity.

3. Importance of Solar System Sizing

Details: Proper sizing ensures your solar system meets your energy needs without over- or under-producing, maximizing return on investment.

4. Using the Calculator

Tips: Enter your annual electricity usage in kWh and your location's average peak sun hours (default 4.5). 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 sum 12 months of usage.

Q2: What are peak sun hours?
A: The equivalent number of hours per day when solar irradiance averages 1,000 W/m². This varies by location.

Q3: What's a typical peak sun hours value?
A: Most locations range from 3-6 peak sun hours daily (default is 4.5).

Q4: Does this account for system losses?
A: No, consider multiplying the result by 1.2-1.3 to account for typical system inefficiencies.

Q5: How accurate is this calculation?
A: It provides a good estimate but consult a solar professional for precise sizing.