1. What is an RV Solar System Calculator?

Definition: This calculator estimates the size of solar system needed for an RV based on daily energy consumption, peak sun hours, and system efficiency.

Purpose: It helps RV owners and solar installers determine the appropriate solar panel capacity for off-grid power needs.

2. How Does the Calculator Work?

The calculator uses the formula:

Where:

• \( P_{kW} \) — Solar system size (kilowatts)
• \( E_{kWh} \) — Daily energy consumption (kilowatt-hours)
• \( t_{sun} \) — Peak sun hours per day
• \( \eta_{solar} \) — System efficiency factor (0-1)

Explanation: The daily energy needs are divided by the available solar energy (sun hours × efficiency) to determine required panel capacity.

3. Importance of Proper Solar Sizing

Details: Correct solar system sizing ensures reliable power supply, avoids overinvestment in panels, and maintains battery health.

4. Using the Calculator

Tips: Enter your daily energy needs in kWh, average peak sun hours (default 4), 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 hours per day when solar irradiance averages 1000W/m². Varies by location and season.

Q2: What affects system efficiency?
A: Panel orientation, temperature, wiring losses, charge controller type, and battery efficiency all impact overall system performance.

Q3: How do I find my daily energy needs?
A: Calculate by summing the watt-hours of all appliances you'll use, or monitor with an energy meter.

Q4: Should I round up the calculated size?
A: Yes, it's recommended to add 20-30% to account for cloudy days and future expansion.

Q5: What about battery storage?
A: This calculator determines panel size only. Battery capacity should be sized separately based on your autonomy needs.