1. What is a Whole House Generator Calculator?

Definition: This calculator estimates the required generator power (in kW) based on your total appliance load and a safety factor.

Purpose: It helps homeowners and contractors determine the appropriate generator size for whole-house power needs.

2. How Does the Calculator Work?

The calculator uses the formula:

Where:

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

Explanation: The total wattage of all appliances is converted to kW (divided by 1000) and multiplied by a safety factor to account for startup surges and future needs.

3. Importance of Proper Generator Sizing

Details: Correct sizing ensures your generator can handle all essential loads without being overloaded, while avoiding excessive costs from an oversized unit.

4. Using the Calculator

Tips:

• Add up the wattage of all appliances you want to power simultaneously
• Use default safety factor of 1.25 (25% buffer) for most homes
• For motor-heavy loads (AC units, pumps), consider increasing safety factor to 1.5

5. Frequently Asked Questions (FAQ)

Q1: What's included in total appliance load?
A: Sum of all lights, appliances, and systems you want to power during an outage.

Q2: Why is a safety factor needed?
A: It accounts for startup surges (especially for motors) and potential future power needs.

Q3: What's a typical safety factor?
A: 1.25 (25% buffer) is standard for residential, while 1.5 may be needed for heavy motor loads.

Q4: How do I find appliance wattages?
A: Check nameplates, manuals, or use our Appliance Wattage Calculator tool.

Q5: Should I round up the generator size?
A: Yes, generators come in standard sizes - round up to the nearest available size.