1. What is a Solar Panel Calculator?

Definition: This calculator estimates the number of solar panels needed based on your energy requirements, panel specifications, and local sunlight conditions.

Purpose: It helps homeowners and businesses determine how many solar panels are required to meet their energy needs.

2. How Does the Calculator Work?

The calculator uses the formula:

Where:

• \( \text{Number} \) — Number of solar panels needed (rounded up)
• \( \text{Load} \) — Daily energy requirement (watt-hours)
• \( P_{\text{per panel}} \) — Power rating of each panel (watts)
• \( H \) — Average daily sunlight hours
• \( PR \) — Performance ratio (system efficiency, 0-1)

Explanation: The energy requirement is divided by the expected daily production of one panel to determine how many panels are needed.

3. Importance of Accurate Calculation

Details: Proper calculation ensures your solar system meets your energy needs without over- or under-investing in panels.

4. Using the Calculator

Tips: Enter your daily energy needs in watt-hours, panel power rating (default 300W), average sunlight hours (default 5), and performance ratio (default 0.75). All values must be > 0.

5. Frequently Asked Questions (FAQ)

Q1: How do I find my daily energy requirement?
A: Check your electricity bill for kWh usage and multiply by 1000 to get watt-hours, then divide by 30 for daily average.

Q2: What's a typical performance ratio?
A: Most systems have PR between 0.7-0.8, accounting for losses from temperature, wiring, inverters, etc.

Q3: How do I determine sunlight hours for my location?
A: Use solar maps or local meteorological data for average peak sun hours in your area.

Q4: Why round up the number of panels?
A: Solar panels can't be divided, so we always round up to ensure your energy needs are fully met.

Q5: Does this include battery storage?
A: No, this calculates panel requirements only. Battery needs depend on your off-grid requirements.