1. What is an RV Solar Calculator?

Definition: This calculator estimates the required solar panel system size (in kW) for an RV based on daily energy needs, peak sun hours, and system efficiency.

Purpose: It helps RV owners and solar installers determine the appropriate solar system size 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 (hours)
• \( \eta_{solar} \) — System efficiency factor (0-1)

Explanation: The formula converts daily energy needs into the required solar panel capacity by accounting for available sunlight and system losses.

3. Importance of Proper Solar Sizing

Details: Correct solar system sizing ensures reliable power supply, prevents battery damage from undercharging, and optimizes system cost.

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: How do I determine my daily energy needs?
A: Add up the wattage of all appliances multiplied by their daily usage hours, then divide by 1000 to get kWh.

Q2: What are typical peak sun hours?
A: This varies by location (3-6 hours in most US regions). Check solar maps for your area.

Q3: Why is system efficiency less than 1?
A: Efficiency accounts for losses in wiring, charge controllers, battery charging, and temperature effects.

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

Q5: Does this include battery storage?
A: No, this calculates solar panel size only. Battery bank should be sized separately based on autonomy needs.