1. What is a Portable Generator Wattage Calculator?

Definition: This calculator estimates the wattage required for a portable generator based on the total load wattage and a safety factor.

Purpose: It helps homeowners, contractors, and event planners determine the appropriate generator size for their power needs.

2. How Does the Calculator Work?

The calculator uses the formula:

Where:

• \( P_w \) — Required generator wattage (watts)
• \( \Sigma P_{load} \) — Total wattage of all connected loads (watts)
• \( SF \) — Safety factor (typically 1.2 for most applications)

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

3. Importance of Proper Generator Sizing

Details: Correct generator sizing ensures reliable power supply, prevents overload damage, and improves fuel efficiency.

4. Using the Calculator

Tips: Enter the total wattage of all devices you plan to power simultaneously and the 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 startup surges (especially for motors) and provides capacity for future additions.

Q2: What's a typical safety factor?
A: Most applications use 1.2 (20% extra), but motor-heavy loads may need 1.5-3x for startup surges.

Q3: How do I find the total load wattage?
A: Add up the wattage of all devices you'll power simultaneously. Check appliance labels or manuals for wattage.

Q4: Should I consider continuous vs peak wattage?
A: Yes. The calculator gives running wattage. For devices with high startup loads (like refrigerators), ensure the generator's peak wattage can handle them.

Q5: Does this include multiple circuits?
A: The calculator gives total wattage. You'll need to distribute loads across generator outlets/circuits based on their individual limits.