RV Solar Panel Calculator

Solar Panel Wattage Formula:

\[ P_w = \frac{E_{kWh} \times 1000}{t_{sun} \times \eta_{solar}} \]

Required Solar Panel Wattage (W):

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1. What is an RV Solar Panel 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 off-grid power needs.

2. How Does the Calculator Work?

The calculator uses the formula:

\[ P_w = \frac{E_{kWh} \times 1000}{t_{sun} \times \eta_{solar}} \]

Where:

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

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

3. Importance of Proper Solar Sizing

Details: Correct solar panel 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, 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: Equivalent hours of full sunlight your location receives daily (varies by season and location).

Q2: Why is system efficiency less than 1?
A: Accounts for losses from wiring, charge controllers, battery charging, and panel orientation.

Q3: What's a typical efficiency factor for RV systems?
A: Most RV systems are 70-80% efficient (0.7-0.8 factor).

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

Q5: Should I round up the calculated wattage?
A: Yes, round up to the nearest standard panel size and consider adding 10-20% for margin.