1. What is a Solar Panel Size Calculator by kWh?

Definition: This calculator estimates the required solar panel system size based on your daily energy consumption and local peak sun hours.

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

2. How Does the Calculator Work?

The calculator uses the formula:

Where:

• \( S \) — Solar panel system size (kW)
• \( E \) — Daily energy consumption (kWh)
• \( H \) — Peak sun hours (hours of equivalent full sunlight per day)

Explanation: Your daily energy need is divided by peak sun hours to determine the required system size that can generate that energy.

3. Importance of Proper Sizing

Details: Correct solar panel sizing ensures your system meets energy needs without over-investing in unnecessary capacity.

4. Using the Calculator

Tips: Enter your average daily kWh usage and local peak sun hours (default 4 hours). All values must be > 0.

5. Frequently Asked Questions (FAQ)

Q1: What are peak sun hours?
A: The equivalent hours per day when solar irradiance averages 1,000 W/m². This varies by location and season.

Q2: How do I find my daily kWh usage?
A: Check your electricity bill for monthly kWh usage, then divide by days in the billing period.

Q3: What's a typical peak sun hours value?
A: Most locations average 3-6 peak sun hours daily (e.g., 4 in moderate climates, 5-6 in sunnier regions).

Q4: Does this account for system inefficiencies?
A: No, consider adding 20-30% to the calculated size to account for real-world losses.

Q5: How does this relate to number of panels?
A: Divide system size (kW) by individual panel rating (e.g., 0.3kW panels) to estimate quantity needed.