1. What is the Generac Size Calculator?

The Generac Size Calculator estimates the appropriate generator size for your home power needs based on the total wattage of your appliances plus a surge factor for starting electrical loads.

2. How Does the Calculator Work?

The calculator uses the following formula:

Where:

• \( \text{Appliance Wattage} \) — Sum of all appliances' running wattage
• \( \text{Surge Factor} \) — Additional wattage needed for motor startup

Explanation: The calculator adds your total appliance wattage to the surge factor needed for starting electrical loads, then recommends an appropriately sized Generac generator.

3. Importance of Proper Generator Sizing

Details: Proper generator sizing is crucial for ensuring your home has enough power during outages without overloading the generator or wasting money on an oversized unit.

4. Using the Calculator

Tips: Add up the wattage of all appliances you want to power simultaneously. Include a surge factor (typically 1.5-3x running wattage for motors). All values must be positive numbers.

5. Frequently Asked Questions (FAQ)

Q1: What's the difference between running and starting wattage?
A: Running wattage is what an appliance uses continuously. Starting wattage is the temporary surge needed when motors start (typically higher).

Q2: How do I find my appliances' wattage?
A: Check appliance labels, manuals, or use a wattage meter. Many Generac dealers provide wattage worksheets.

Q3: What size generator do most homes need?
A: Most homes need 7,000-20,000 watts. Small homes might use 7-10kW, medium homes 12-15kW, large homes 17-22kW.

Q4: Should I size up for future needs?
A: It's often wise to choose a generator slightly larger than your current needs to accommodate future additions.

Q5: What about whole-house generators?
A: Whole-house generators typically start at 22kW and can power everything in your home simultaneously.