1. What is a Generator Watts Calculator?

Definition: This calculator determines the total wattage needed for a generator by adding running watts and starting watts.

Purpose: It helps homeowners and professionals properly size a generator for their power needs.

2. How Does the Calculator Work?

The calculator uses the formula:

Where:

• Total Watts — The generator size needed (watts)
• Running Watts — Continuous power required (watts)
• Starting Watts — Extra power needed for motor startup (watts)

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

3. Importance of Proper Generator Sizing

Details: Correct wattage calculation ensures your generator can handle all connected loads without overload while being cost-effective.

4. Using the Calculator

Tips:

• List all appliances/equipment you need to power
• Sum their running watts (continuous power needs)
• Identify the highest starting watts among motorized items
• Enter these values to get your total required wattage

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 the extra temporary power required when motors start (typically 2-3x running watts).

Q2: How do I find an appliance's starting watts?
A: Check the manufacturer's specs or look for "LRA" (Locked Rotor Amps) on motor plates. Starting watts are typically 2-3x running watts for motors.

Q3: Should I add all starting watts together?
A: No, only include the highest starting watts value since motors won't all start simultaneously.

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

Q5: Can this calculator be used for solar systems?
A: The same principle applies, but solar systems have additional considerations like battery storage and sunlight hours.