1. What is a Watt Calculator for Portable Generators?

Definition: This calculator estimates the total wattage required for a portable generator based on the sum of running watts and the highest starting watts of your appliances.

Purpose: It helps homeowners and professionals properly size a generator to handle all electrical loads without overloading.

2. How Does the Calculator Work?

The calculator uses the formula:

Where:

• Total Watts — Minimum generator capacity needed (watts)
• Running Watts — Sum of all continuous power requirements
• Starting Watts — Highest surge wattage from any single device

Explanation: The total running watts of all devices are added to the largest starting watts (not the sum of all starting watts).

3. Importance of Proper Wattage Calculation

Details: Correct sizing prevents generator overload, ensures reliable power during outages, and extends equipment lifespan.

4. Using the Calculator

Tips:

1. Add up the running watts of all devices you plan to power simultaneously
2. Identify the device with the highest starting watts (typically motors like AC units or refrigerators)
3. Enter these values to get your minimum generator size

5. Frequently Asked Questions (FAQ)

Q1: Why don't we sum all starting watts?
A: Because devices don't all start simultaneously - we only need to account for the largest surge.

Q2: What's a typical starting watts for common appliances?
A: Refrigerators (1200W), AC units (2200W), power tools (1000-3000W) often have high starting watts.

Q3: Should I add a safety margin?
A: Yes, it's recommended to add 10-20% to the calculated total for safety and future needs.

Q4: How do I find appliance wattage?
A: Check manufacturer labels or use our Appliance Wattage Reference tool.

Q5: What about continuous vs intermittent loads?
A: Only include devices that might run simultaneously in your running watts total.