1. What is a Solar Power Energy System Calculator?

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

Purpose: It helps homeowners and solar installers determine the appropriate solar panel system size to meet energy needs.

2. How Does the Calculator Work?

The calculator uses the formula:

Where:

• System Size — Required solar system capacity in kilowatts (kW)
• Annual kWh — Total annual electricity consumption in kilowatt-hours
• Peak Hours — Average daily peak sun hours at your location (default 4.5)

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

3. Importance of Solar System Sizing

Details: Proper sizing ensures your solar system meets your energy needs while maximizing return on investment and system efficiency.

4. Using the Calculator

Tips: Enter your annual electricity consumption in kWh and your location's 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 the past year - most show annual consumption. Or multiply monthly average by 12.

Q2: What are peak sun hours?
A: The equivalent hours per day when solar irradiance averages 1,000 W/m². Varies by location (3-6 hours typically).

Q3: Should I adjust for system losses?
A: This is a basic calculation. For real systems, add 20-30% to account for inefficiencies and losses.

Q4: Does this include battery storage?
A: No, this calculates grid-tied system size. Battery systems require additional calculations.

Q5: How accurate is this estimate?
A: It provides a good starting point, but professional solar assessments consider more factors like shading, orientation, etc.