1. What is a Generator Wattage Worksheet?

Definition: This calculator determines the required generator wattage based on the total electrical load and a safety factor.

Purpose: It helps homeowners, contractors, and engineers properly size a generator for backup power needs.

2. How Does the Calculator Work?

The calculator uses the formula:

Where:

• \( P_w \) — Required generator wattage (watts)
• \( \sum P_{load} \) — Sum of all connected loads (watts)
• \( SF \) — Safety factor (typically 1.2-1.5)

Explanation: The total wattage of all devices is multiplied by a safety factor to account for startup surges and future expansion.

3. Importance of Proper Generator Sizing

Details: Correct sizing ensures reliable power, prevents overload damage, and allows for future expansion while avoiding excessive costs.

4. Using the Calculator

Tips: Enter the total wattage of all devices to be powered and a safety factor (default 1.2). All values must be > 0.

5. Frequently Asked Questions (FAQ)

Q1: Why do we need a safety factor?
A: The safety factor accounts for motor startup surges (which can be 3-5x running wattage) and potential future additions.

Q2: What's a typical safety factor?
A: Residential applications typically use 1.2-1.3, while commercial/industrial uses 1.3-1.5 depending on load types.

Q3: How do I find the total load wattage?
A: Sum the wattage of all devices to be powered simultaneously, or use our Load Calculator tool.

Q4: Should I include all devices in my home?
A: Only include devices you plan to run simultaneously during an outage. Consider staggered startup for large motors.

Q5: What about three-phase power?
A: This calculator is for single-phase. For three-phase, use our Three-Phase Generator Calculator.