1. What is a Solar Panel Sizing Calculator?

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

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:

• \( \text{Size} \) — Required solar panel system size (kW)
• \( \text{Load} \) — Daily energy consumption (kWh/day)
• \( \text{Peak Hours} \) — Average peak sunlight hours per day
• \( \text{Efficiency} \) — System efficiency factor (0-1)

Explanation: The daily energy load is divided by the product of peak sun hours and system efficiency to determine the required solar panel capacity.

3. Importance of Proper Solar Panel Sizing

Details: Correct sizing ensures your solar system meets energy needs without over-investment in panels, while accounting for real-world inefficiencies.

4. Using the Calculator

Tips: Enter your daily energy usage in kWh, local peak sun hours (default 4.5), and system efficiency (default 0.75). All values must be > 0.

5. Frequently Asked Questions (FAQ)

Q1: 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 and season.

Q2: What affects system efficiency?
A: Factors include inverter efficiency (95-97%), temperature losses, wiring losses, and panel orientation (typically 75-85% total).

Q3: How do I find my daily energy load?
A: Check your electricity bill for monthly kWh usage and divide by 30, or use an energy monitor for precise measurement.

Q4: Should I round up the calculated size?
A: Yes, it's recommended to add 10-20% to account for panel degradation over time and less-than-ideal conditions.

Q5: Does this include battery storage?
A: No, this calculates grid-tied system size. For off-grid systems, you'll need additional calculations for battery capacity.