1. What is a Generator Size Calculator?

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 for residential power needs.

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 load in watts is converted to kilowatts (divided by 1000) then multiplied by a safety factor to ensure adequate capacity.

3. Importance of Proper Generator Sizing

Details: Correct generator sizing ensures reliable power during outages, prevents overload damage, and improves fuel efficiency.

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 safety factor should I use?
A: 1.2 is typical for residential use. Use 1.5 if you have motor-driven appliances (like AC units) that require extra startup power.

Q3: Should I include all appliances?
A: Only include essential appliances you need during an outage. Prioritize refrigerators, lights, and critical systems.

Q4: What about surge power requirements?
A: The safety factor accounts for surge requirements. For large motors, you may need to increase the factor to 1.5.

Q5: How accurate is this calculation?
A: This provides a good estimate. For precise sizing, consult an electrician who can perform a detailed load analysis.