1. What is the RV Solar Panel Size Calculator?

Definition: This calculator determines the solar panel wattage needed for an RV based on daily energy consumption, peak sun hours, and system efficiency.

Purpose: It helps RV owners and solar installers properly size solar panel systems for mobile applications.

2. How Does the Calculator Work?

The calculator uses the formula:

Where:

• \( P_w \) — Required solar panel size (watts)
• \( E_{kWh} \) — Daily energy consumption (kilowatt-hours)
• \( t_{sun} \) — Peak sun hours per day
• \( \eta_{solar} \) — System efficiency factor (0-1)

Explanation: Converts energy needs to watt-hours, then divides by available sunlight hours adjusted for system losses.

3. Importance of Proper Solar Sizing

Details: Correct sizing ensures reliable power supply, prevents battery damage, and optimizes system cost and space requirements.

4. Using the Calculator

Tips: Enter your daily kWh usage, local peak sun hours (default 4), and system efficiency (default 0.75). All values must be > 0.

5. Frequently Asked Questions (FAQ)

Q1: What are typical peak sun hours?
A: Varies by location: 3-4 in northern areas, 5-6 in sunny southwest. Check solar maps for your region.

Q2: Why is system efficiency less than 1?
A: Accounts for losses in wiring, charge controller, battery charging, and panel temperature effects.

Q3: Should I round up the panel size?
A: Yes, always round up to the nearest standard panel size and consider adding 10-20% for cloudy days.

Q4: How do I find my daily energy needs?
A: Add up all appliance wattages multiplied by hours used each day, then divide by 1000 for kWh.

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