1. What is a Generator Size Calculator?

Definition: This calculator determines the required generator size in kilowatts based on energy consumption, time duration, and a safety factor.

Purpose: It helps select the appropriately sized generator for backup power needs or remote power applications.

2. How Does the Calculator Work?

The calculator uses the formula:

Where:

• \( P_{kW} \) — Generator power required (kilowatts)
• \( E_{kWh} \) — Energy consumption (kilowatt-hours)
• \( t \) — Time duration (hours)
• \( SF \) — Safety factor (typically 1.2 for generators)

Explanation: The energy consumption is divided by time to get average power, then multiplied by a safety factor to handle startup surges and future loads.

3. Importance of Proper Generator Sizing

Details: Correct generator sizing ensures reliable power supply, prevents overload conditions, and improves fuel efficiency.

4. Using the Calculator

Tips: Enter the total energy needed in kWh, the time duration in hours, and safety factor (default 1.2). All values must be positive numbers.

5. Frequently Asked Questions (FAQ)

Q1: Why do we need a safety factor?
A: The safety factor accounts for startup surges, future load additions, and ensures the generator isn't constantly running at full capacity.

Q2: What's a typical safety factor?
A: Most applications use 1.2 (20% extra capacity), but critical systems may use 1.5 or more.

Q3: How do I find my energy consumption?
A: Check utility bills, sum appliance ratings, or use energy monitoring devices to measure actual usage.

Q4: Does this include three-phase power?
A: This calculates total kW. For three-phase, divide the result by 1.732 (√3) to get current per phase.

Q5: Should I round up the result?
A: Yes, always round up to the nearest standard generator size available in your market.