1. What is a Whole House Solar Power System Calculator?

Definition: This calculator estimates the size of solar power system needed based on your monthly electricity consumption and local peak sun hours.

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

2. How Does the Calculator Work?

The calculator uses the formula:

Where:

• \( \text{Size} \) — Solar system size (kilowatts)
• \( \text{Monthly kWh} \) — Your household's monthly electricity consumption
• \( \text{Peak Hours} \) — Average daily peak sun hours in your location

Explanation: The formula converts your monthly energy usage into the required solar system size by accounting for daily solar production.

3. Importance of Proper Solar Sizing

Details: Correct 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 average monthly electricity usage in kWh and your local peak sun hours (default 4.5). All values must be > 0.

5. Frequently Asked Questions (FAQ)

Q1: How do I find my monthly kWh usage?
A: Check your electricity bill - it typically shows your monthly consumption in kilowatt-hours.

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: Should I adjust for system inefficiencies?
A: This calculation provides a baseline. For more accuracy, consider adding 10-20% to account for system losses.

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

Q5: How does seasonality affect this calculation?
A: For year-round performance, use your highest monthly usage or annual average, and your location's worst-case sun hours.