1. What is the Generator Wattage Calculator?

This calculator helps determine the appropriate wattage capacity needed for a portable generator when repairing or replacing one. It accounts for your total electrical load plus a safety factor to ensure reliable operation.

2. How Does the Calculator Work?

The calculator uses the generator wattage formula:

Where:

• \( P_{total} \) — Required generator capacity in watts
• \( \Sigma P_{loads} \) — Sum of all connected load wattages
• \( 1.2 \text{ to } 1.5 \) — Safety factor (20% to 50% extra capacity)

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

3. Importance of Proper Generator Sizing

Details: Correct generator sizing prevents overload (which can damage both generator and appliances) and underutilization (wasting money on excessive capacity).

4. Using the Calculator

Tips:

• Add up wattages of all devices you plan to run simultaneously
• Choose safety factor based on expected usage: 1.2 for light, 1.35 for moderate, 1.5 for heavy use
• For motorized appliances, use starting wattage (typically 2-3x running wattage)

5. Frequently Asked Questions (FAQ)

Q1: Why is a safety factor needed?
A: It accounts for startup power surges (especially for motors) and provides headroom for additional loads or reduced efficiency over time.

Q2: How do I find my appliances' wattage?
A: Check labels or manuals; for simple devices: watts = volts × amps. Many appliances list running and starting watts.

Q3: What's the difference between running and starting watts?
A: Starting watts (surge) are higher for 1-3 seconds when motors start. The calculator should use starting watts for motorized devices.

Q4: Can I use this for whole-house generators?
A: The principle is similar, but whole-house systems require professional assessment of your electrical panel and usage patterns.

Q5: What if my calculated wattage is between standard generator sizes?
A: Always round up to the next available size to ensure adequate capacity.