1. What is a Watts Calculator for Home Generator?

Definition: This calculator estimates the total wattage needed for a home generator based on the sum of running watts and maximum starting watts of all appliances.

Purpose: It helps homeowners and electricians determine the appropriate generator size needed to power essential appliances during outages.

2. How Does the Calculator Work?

The calculator uses the formula:

Where:

• Total Watts — Total generator capacity needed (watts)
• Running Watts — Continuous power required by all appliances (watts)
• Starting Watts — Maximum surge power needed when appliances start (watts)

Explanation: The running watts represent continuous power draw, while starting watts account for the temporary surge when motors start.

3. Importance of Proper Wattage Calculation

Details: Accurate wattage calculation ensures your generator can handle both running loads and startup surges without overload.

4. Using the Calculator

Tips: Enter the sum of all running watts and the highest single starting watts value from your appliance list. All values must be ≥ 0.

5. Frequently Asked Questions (FAQ)

Q1: What's the difference between running and starting watts?
A: Running watts are continuous power needs, while starting watts are temporary surges (typically 2-3x running watts) when motors start.

Q2: How do I find my appliances' wattage?
A: Check appliance labels, manuals, or use our Appliance Wattage Calculator. Some appliances only list amps - multiply by voltage (120V) to get watts.

Q3: Should I add all starting watts together?
A: No, only add the highest single starting watts value since appliances don't all start simultaneously.

Q4: What safety margin should I add?
A: It's recommended to add 10-20% to the calculated total for safety and future expansion.

Q5: Can I run everything at once?
A: The calculator shows maximum capacity needed. For efficiency, stagger high-wattage appliance use.