1. What is Generator Wattage Calculation?

This calculation determines the minimum wattage required for a generator to safely power all connected loads while charging batteries. It accounts for total power consumption plus a safety margin.

2. How Does the Calculator Work?

The calculator uses the formula:

Where:

• \( P_{total} \) — Required generator wattage (W)
• \( \Sigma P_{loads} \) — Sum of all connected loads (W)
• 1.2 to 1.5 — Safety factor (20-50% margin)

Explanation: The safety factor accounts for startup surges, inefficiencies, and future expansion.

3. Importance of Proper Generator Sizing

Details: Undersized generators can overload and fail, while oversized ones operate inefficiently. Proper sizing ensures reliable power and optimal fuel consumption.

4. Using the Calculator

Tips: Enter all connected loads in watts. Choose 1.2 safety factor for typical use or 1.5 for critical systems. Include all devices that will run simultaneously.

5. Frequently Asked Questions (FAQ)

Q1: Why include a safety factor?
A: To account for startup surges (especially motors), voltage drops, and future additions to your system.

Q2: Should I include battery charging wattage?
A: Yes, include the maximum wattage your charger will draw during operation.

Q3: What about intermittent loads?
A: Include all loads that might run simultaneously, even if not continuous.

Q4: How does altitude affect generator sizing?
A: At higher altitudes, derate generator capacity by 3-4% per 1000 feet above sea level.

Q5: What if my loads have high startup currents?
A: For motors or compressors, use the starting wattage (typically 3x running wattage) in your calculation.