1. What is a Home Generator Size Calculator?

Definition: This calculator estimates the size of generator needed based on your total electrical load and a safety factor.

Purpose: It helps homeowners and professionals determine the appropriate generator capacity for backup power needs.

2. How Does the Calculator Work?

The calculator uses the formula:

Where:

• \( P_{kW} \) — Generator size needed (kilowatts)
• \( \Sigma(P_{load}) \) — Sum of all electrical loads (watts)
• \( SF \) — Safety factor (typically 1.2-1.5)

Explanation: The total wattage is converted to kilowatts (divided by 1000) then 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 critical loads without being overloaded, while avoiding unnecessary costs of an oversized unit.

4. Using the Calculator

Tips: Enter the total wattage of all appliances you want to power simultaneously and choose an appropriate safety factor (default 1.2).

5. Frequently Asked Questions (FAQ)

Q1: How do I find my total electrical load?
A: Add up the wattage of all appliances you want to power simultaneously. Check appliance labels or manuals for wattage information.

Q2: What safety factor should I use?
A: Typically 1.2 for residential use. Use 1.5 if you have many motor-driven appliances (AC units, refrigerators) that have high startup currents.

Q3: Should I include every appliance in my home?
A: No, only include essential appliances you'd need during an outage. Consider your "must-have" circuits only.

Q4: What about central air conditioning?
A: AC units often require 2-3 times their running wattage at startup. Be sure to account for this in your total load calculation.

Q5: Is this calculation for whole-house or portable generators?
A: The calculation method works for both, but whole-house generators typically need more precise sizing by an electrician.