1. What is a Solar System Size Calculator?

Definition: This calculator estimates the size (in kW) of solar system needed based on your monthly electricity consumption and average daily sunlight hours.

Purpose: It helps homeowners and businesses determine the appropriate solar panel system size for their energy needs.

2. How Does the Calculator Work?

The calculator uses the formula:

Where:

• \( \text{Size} \) — Solar system size needed (kW)
• \( \text{Monthly kWh} \) — Your monthly electricity consumption (kWh)
• \( \text{Hours} \) — Average daily sunlight hours in your area
• \( 1.2 \) — Factor accounting for system losses (20%)
• \( 30 \) — Average number of days in a month

Explanation: The formula calculates the kW size needed to generate your monthly consumption, accounting for average sunlight and system inefficiencies.

3. Importance of Proper Sizing

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

4. Using the Calculator

Tips: Enter your monthly electricity usage in kWh and your area's average daily sunlight hours (default 4 hours). All values must be > 0.

5. Frequently Asked Questions (FAQ)

Q1: Why is there a 1.2 multiplier in the formula?
A: This accounts for typical system losses (about 20%) due to factors like inverter inefficiency, wiring losses, and panel degradation.

Q2: What's a typical daily sunlight value?
A: Most locations average 4-5 peak sun hours per day, but this varies by location and season.

Q3: Should I use my highest or average monthly consumption?
A: For full offset, use your highest monthly usage. For partial solar, use your average.

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 assessment is recommended for precise sizing.