1. What is the Generator Power Calculator?

This calculator helps determine the appropriate generator size for your home by summing the wattage of all major appliances and applying a safety factor to account for startup surges and future needs.

2. How Does the Calculator Work?

The calculator uses the following formula:

Where:

• \( P_{total} \) — Recommended generator size in watts
• \( \sum P_{loads} \) — Sum of all appliance wattages
• Safety Factor — Multiplier (1.2 to 1.5) to account for startup surges and future needs

Explanation: Appliances often require 2-3 times their rated power during startup. The safety factor ensures your generator can handle these temporary surges.

3. Importance of Proper Generator Sizing

Details: An undersized generator may fail to power all appliances or be damaged by overload. An oversized generator is less efficient and more expensive. Proper sizing ensures reliable power during outages.

4. Using the Calculator

Tips:

• List all major appliances you want to power during an outage
• Find wattage ratings on appliance labels or manuals
• For motor-driven appliances (AC, fridge), use the starting wattage if available
• Choose safety factor based on your needs (1.2 for minimal margin, 1.5 for maximum safety)

5. Frequently Asked Questions (FAQ)

Q1: What's the difference between running and starting watts?
A: Running watts are continuous power needs. Starting watts are temporary surges (2-3x running watts) when motors start. The calculator accounts for this with the safety factor.

Q2: Should I include every appliance in my home?
A: No, only include essential appliances you'd need during an outage. Prioritize fridge, lights, furnace, etc.

Q3: What safety factor should I choose?
A: 1.2 for minimal margin (if you know exact startup needs), 1.35 for balanced use, or 1.5 if you want maximum safety margin.

Q4: How do I find my appliance wattages?
A: Check appliance labels, manuals, or search online for typical wattages. Some appliances list amps - multiply by voltage (120V) to get watts.

Q5: Should I round up to the nearest generator size?
A: Yes, generators come in standard sizes. Always round up to the next available size for safety.

Typical Appliance Wattages

Appliance	Running Watts	Starting Watts
Refrigerator	700	2200
Central AC (3 ton)	3500	5000
Furnace Fan	800	2350
Microwave	1000	1000
LED Lights (per bulb)	10	10