1. What is a Generator Size Calculator for House?

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 electricians determine the appropriate generator capacity needed to power a house during outages.

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 1.2-1.5)

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 generator sizing ensures reliable power during outages, prevents overload damage, and allows for efficient operation.

4. Using the Calculator

Tips: Enter the total wattage of all appliances you want to power simultaneously and a safety factor (default 1.2). All values must be > 0.

5. Frequently Asked Questions (FAQ)

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

Q2: What's a typical safety factor?
A: 1.2 is common for residential use, but use 1.5 if you have many motor-driven appliances (AC, refrigerators, etc.).

Q3: Should I size for all appliances or just essentials?
A: This depends on your needs. For whole-house coverage, include everything. For essential circuits only, calculate just those loads.

Q4: Does this account for startup surges?
A: The safety factor helps cover startup surges, but for large motors, you may need to add their starting wattage separately.

Q5: How much extra capacity should I leave?
A: It's recommended to have 20-30% extra capacity beyond your calculated needs for future additions.