1. What is a Solar Panels Calculator?

Definition: This calculator estimates the number of solar panels needed to meet a home's annual electricity consumption.

Purpose: It helps homeowners and solar installers determine how many solar panels are required for a solar power system.

2. How Does the Calculator Work?

The calculator uses the formula:

Where:

• \( \text{Panels} \) — Number of solar panels needed
• \( \text{Home kWh} \) — Annual electricity consumption (kilowatt-hours)
• \( \text{Panel kWh/year} \) — Annual output per solar panel (kilowatt-hours)

Explanation: The home's annual electricity usage is divided by the annual output of a single solar panel to determine how many panels are needed.

3. Importance of Solar Panel Calculation

Details: Accurate panel estimation ensures proper system sizing, optimal energy production, and cost-effective solar installations.

4. Using the Calculator

Tips: Enter your home's annual electricity usage in kWh and the expected annual output per panel (default 400 kWh/year). All values must be > 0.

5. Frequently Asked Questions (FAQ)

Q1: How do I find my home's annual kWh usage?
A: Check your electricity bills for the past year and sum the monthly kWh consumption.

Q2: What's a typical panel output?
A: Most residential solar panels produce 250-400 kWh per year, depending on size, efficiency, and location.

Q3: Does this account for sunlight variations?
A: No, this is a basic calculation. For precise estimates, consult a solar professional who considers local conditions.

Q4: Should I add extra panels?
A: Consider adding 10-20% more panels to account for inefficiencies, future needs, or reduced output over time.

Q5: What affects panel output?
A: Output depends on panel wattage, sunlight hours, roof angle, shading, temperature, and system efficiency.