1. What is a Whole House Generator Calculator?

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

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

2. How Does the Calculator Work?

The calculator uses the formula:

Where:

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

Explanation: The total load is converted from watts 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 electrical load in watts and safety factor (default 1.25). All values must be > 0.

5. Frequently Asked Questions (FAQ)

Q1: How do I find my total electrical load?
A: Sum the wattage of all appliances you want to power simultaneously, or use our Electrical Load Calculator.

Q2: What's a typical safety factor?
A: Residential applications typically use 1.25, while commercial may use 1.5 or higher.

Q3: Should I round up the generator size?
A: Yes, always round up to the nearest standard generator size available.

Q4: Does this include startup surges?
A: The safety factor accounts for typical startup surges, but motors may require additional consideration.

Q5: How often should I recalculate?
A: Recalculate whenever you add significant new electrical loads to your home.