1. What is a Solar Panel Size Calculator?

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

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

2. How Does the Calculator Work?

The calculator uses the formula:

Where:

• \( \text{Size} \) — Required solar panel system size (kW)
• \( \text{Daily kWh} \) — Your average daily energy consumption (kWh)
• \( \text{Peak Hours} \) — Average daily peak sunlight hours in your location
• \( 1.2 \) — Factor accounting for system inefficiencies (20% buffer)

Explanation: The formula divides your energy needs by the available sunlight hours, with a 20% buffer for real-world conditions.

3. Importance of Proper Solar Sizing

Details: Correct sizing ensures your solar system meets your 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 4.5 hours). All values must be > 0.

5. Frequently Asked Questions (FAQ)

Q1: Why multiply by 1.2?
A: This accounts for system inefficiencies (inverters, wiring, panel degradation) and ensures you generate enough power.

Q2: What are typical peak sun hours?
A: Most locations get 3-6 peak hours. Southern states average 5-6, northern states 3-4.5.

Q3: How do I find my daily kWh usage?
A: Check your electricity bill for monthly kWh and divide by days in the billing period.

Q4: Does this include battery storage?
A: No, this calculates grid-tied systems. For off-grid, you'll need additional calculations for battery capacity.

Q5: Should I round up the result?
A: Yes, solar panels come in standard sizes (e.g., 3kW, 5kW, 7kW systems). Round up to the nearest standard size.