1. What is a Solar Panel System Size Calculator?

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

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

2. How Does the Calculator Work?

The calculator uses the formula:

Where:

• System Size — Required solar system capacity (kilowatts)
• Annual kWh — Your yearly electricity consumption (kilowatt-hours)
• Peak Hours — Average daily peak sunlight hours at your location

Explanation: The formula divides your annual energy needs by the total available solar energy (365 days × peak hours) to determine the system size needed.

3. Importance of Accurate System Sizing

Details: Proper sizing ensures your solar system meets your energy needs without over- or under-producing, maximizing efficiency and 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 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 W/m². This varies by location.

Q2: How do I find my annual kWh usage?
A: Check your electricity bills - most show annual consumption. Alternatively, multiply average monthly usage by 12.

Q3: What's a typical peak sun hours value?
A: Most locations range from 3-6 peak hours. 4.5 is a good average for many regions.

Q4: Does this account for system losses?
A: No, consider adding 10-20% to the calculated size to account for inefficiencies and future needs.

Q5: How does this relate to number of solar panels?
A: Divide system size by panel wattage (e.g., 5kW system ÷ 0.3kW panels = ~17 panels).