1. What is a Generac Generator Size Calculator?

Definition: This calculator estimates the required generator size in kilowatts based on your total electrical load and a safety factor.

Purpose: It helps homeowners and professionals determine the appropriate Generac generator size for their power needs.

2. How Does the Calculator Work?

The calculator uses the formula:

Where:

• \( P_{kW} \) — Generator size (kilowatts)
• \( \Sigma P_{load} \) — Total electrical load (watts)
• \( SF \) — Safety factor (typically 1.25 for residential)

Explanation: The total load in watts is converted to kilowatts (divided by 1000) then 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 during outages, prevents overloading, and maximizes fuel efficiency.

4. Using the Calculator

Tips: Enter the total wattage of all appliances you want to power simultaneously and the safety factor (default 1.25). All values must be > 0.

5. Frequently Asked Questions (FAQ)

Q1: Why do we need a safety factor?
A: The safety factor accounts for motor startup surges (which can be 3-5x running watts) and potential future power needs.

Q2: What's a typical safety factor?
A: 1.25 is common for residential, while commercial applications might use 1.5 or higher depending on load characteristics.

Q3: How do I find my total load?
A: Add up the wattage of all appliances you want to run simultaneously, including their starting watts for motors.

Q4: Should I round up the generator size?
A: Yes, Generac generators come in standard sizes - round up to the nearest available model.

Q5: Does this include whole-house coverage?
A: This calculates minimum requirements. For whole-house coverage, you'll need to account for your entire electrical panel load.