1. What is a Portable Generator Power Calculator?

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

Purpose: It helps homeowners, contractors, and event planners determine the appropriate generator size for their power needs.

2. How Does the Calculator Work?

The calculator uses the formula:

Where:

• \( P_{kW} \) — Generator power (kilowatts)
• \( \Sigma P_{load} \) — Total connected load (watts)
• \( SF \) — Safety factor (typically 1.2-1.5)

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 supply, prevents overload conditions, and maximizes fuel efficiency.

4. Using the Calculator

Tips: Enter the total connected load in watts and safety factor (default 1.2). All values must be > 0.

5. Frequently Asked Questions (FAQ)

Q1: Why do we need a safety factor?
A: The safety factor accounts for motor startup surges (which can be 3-7x running watts) and potential future load additions.

Q2: What's a typical safety factor?
A: Most applications use 1.2-1.5, with higher factors for motor-heavy loads or critical applications.

Q3: How do I find the total load?
A: Sum the wattage of all devices to be powered simultaneously, including both running and starting watts for motors.

Q4: Should I size for running or starting watts?
A: The generator must handle the highest starting wattage of any single device plus the running watts of all other devices.

Q5: What about three-phase vs single-phase?
A: This calculator assumes single-phase power. For three-phase systems, consult a qualified electrician.