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, local peak sun hours, and system performance ratio.

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

2. How Does the Calculator Work?

The calculator uses the formula:

Where:

• System Size — Required solar capacity in kilowatts (kW)
• Annual Consumption — Your yearly electricity usage in kilowatt-hours (kWh)
• Peak Sun Hours — Average daily sunlight hours at your location (default 4.5 hours)
• Performance Ratio — System efficiency factor (default 0.75)

Explanation: The formula accounts for your energy needs, local solar conditions, and system losses to determine the optimal system size.

3. Importance of Accurate System Sizing

Details: Proper sizing ensures your solar system meets your energy needs without over-investing in unnecessary capacity, while maximizing return on investment.

4. Using the Calculator

Tips: Enter your annual electricity consumption, local peak sun hours (default 4.5), and performance ratio (default 0.75). All values must be > 0.

5. Frequently Asked Questions (FAQ)

Q1: How do I find my annual electricity consumption?
A: Check your utility bills for total yearly kWh usage or sum 12 months of bills.

Q2: What are peak sun hours for my location?
A: Consult solar maps or local solar installers. Typical values range from 3-6 hours daily.

Q3: What affects the performance ratio?
A: Factors include panel efficiency, inverter losses, temperature, shading, and system age (0.75 is typical).

Q4: Should I size for 100% of my consumption?
A: Not necessarily. Consider your goals (full offset vs partial), budget, and net metering policies.

Q5: Does this include battery storage?
A: No, this calculates grid-tied system size. Battery systems require additional calculations.