1. What is Generator Wattage Calculation?

Generator wattage calculation determines the appropriate size generator needed to power all electrical loads in your home with a safety margin. Proper sizing ensures reliable operation without overloading the generator.

2. How Does the Calculator Work?

The calculator uses the generator sizing formula:

Where:

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

Explanation: The safety factor accounts for startup surges, future additions, and ensures the generator isn't constantly running at full capacity.

3. Importance of Proper Sizing

Details: Correct generator sizing prevents damage from overload, improves fuel efficiency, extends equipment life, and ensures all critical loads can operate simultaneously.

4. Using the Calculator

Tips:

• Calculate or measure your total connected load
• Choose safety factor: 1.2 for residential, 1.3-1.5 for heavy usage
• Consider both running and startup wattage for motors
• Round up to nearest standard generator size

5. Frequently Asked Questions (FAQ)

Q1: Why is a safety factor needed?
A: It accounts for motor startup surges (3-7x running watts), future additions, and prevents constant operation at 100% capacity which reduces generator life.

Q2: What are common generator sizes?
A: Residential sizes typically range from 5,000W to 20,000W. Common sizes include 7,500W, 10,000W, and 15,000W.

Q3: Should I size for all loads or essentials only?
A: For whole-house coverage, size for all loads. For emergency backup, size for essential circuits only (well pump, fridge, lights, etc.).

Q4: How do I calculate my total load?
A: Sum the wattage of all appliances you want to run simultaneously. Check nameplates or use appliance wattage charts.

Q5: What about central air conditioning?
A: Central AC requires special consideration due to high startup current (LRA). Typically need 2.5-3x the running watts for startup.