1. What is Generator Sizing?

Generator sizing is the process of determining the appropriate wattage capacity for a generator based on the total electrical load it needs to support, plus a safety buffer. Proper sizing ensures reliable operation and prevents overload.

2. How Does the Calculator Work?

The calculator uses the generator sizing formula:

Where:

• \( P_{total} \) — Required generator size in watts
• \( \Sigma P_{loads} \) — Sum of all connected loads in watts
• 1.2 to 1.5 — Safety factor (20% to 50% buffer)

Explanation: The safety factor accounts for startup surges, future additions, and ensures the generator isn't constantly running at full capacity.

3. Importance of Proper Generator Sizing

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

4. Using the Calculator

Tips:

1. Calculate the total wattage of all devices you plan to power
2. Select an appropriate safety factor (1.2 for minimal buffer, 1.5 for heavy equipment)
3. The result shows the minimum generator size you should consider

5. Frequently Asked Questions (FAQ)

Q1: Why is a safety factor needed?
A: Many appliances have startup surges that require 2-3 times their running wattage. The buffer prevents overload during these surges.

Q2: How do I calculate total load wattage?
A: Add up the wattage of all devices you want to run simultaneously. Check appliance labels or manuals for wattage information.

Q3: What safety factor should I choose?
A: Use 1.5 if you have motor-driven appliances (AC, fridge, power tools). Use 1.2-1.3 for mostly resistive loads (lights, heaters).

Q4: Should I consider future expansion?
A: Yes, it's wise to add 10-20% beyond your current needs if you anticipate adding more equipment later.

Q5: What about three-phase vs single-phase?
A: This calculator provides basic sizing. For three-phase systems, consult an electrician as voltage and phase balance affect sizing.