1. What is Generator Wattage Calculation?

Definition: This calculator determines the wattage capacity needed for a generator based on your total electrical load and a safety factor.

Purpose: It helps ensure you select a generator with sufficient power capacity for your needs while accounting for startup surges and safety margins.

2. How Does the Calculator Work?

The calculator uses the formula:

Where:

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

Explanation: The total load wattage is multiplied by a safety factor to account for startup surges and provide operating headroom.

3. Importance of Proper Generator Sizing

Details: Correct generator sizing prevents overload conditions, ensures reliable operation, and extends equipment lifespan.

4. Using the Calculator

Tips: Enter the sum of all electrical loads in watts and a safety factor (default 1.2). All values must be > 0.

5. Frequently Asked Questions (FAQ)

Q1: What is a safety factor?
A: A multiplier (typically 1.2-1.5) that accounts for startup surges and provides operating margin.

Q2: How do I calculate total load wattage?
A: Sum the wattage of all devices you plan to power simultaneously, including their startup surges.

Q3: When should I use a higher safety factor?
A: For motor-heavy loads (like AC units or pumps) use 1.5, for resistive loads (lights, heaters) 1.2 is sufficient.

Q4: Should I consider future expansion?
A: Yes, you may want to add 10-20% beyond your current needs for future additions.

Q5: What about three-phase vs single-phase?
A: This calculator provides total wattage. For three-phase systems, consult an electrician for proper sizing.