1. What is Generator Power Calculation?

The generator power calculation estimates the minimum wattage required for a portable generator to safely power your electrical devices. It accounts for both running watts and startup surges.

2. How Does the Calculator Work?

The calculator uses the formula:

Where:

• \( P_{total} \) — Total generator power needed (watts)
• \( \Sigma P_{loads} \) — Sum of all connected loads (watts)
• 1.2 to 1.5 — Safety factor multiplier

Explanation: The safety factor accounts for startup surges (typically 1.2-1.5 times running wattage) and provides headroom for additional loads.

3. Importance of Proper Sizing

Details: Proper generator sizing prevents overload (which can damage equipment) and underutilization (which wastes fuel and money). Oversizing by 20-50% is typical for most applications.

4. Using the Calculator

Tips: Enter wattage for each appliance/load. Select safety factor based on usage: 1.2 for lights/electronics, 1.35 for mixed use, 1.5 for motors/pumps. Include all devices that might run simultaneously.

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 up.

Q2: How do I find an appliance's wattage?
A: Check nameplate ratings or manuals. For simple devices: watts = volts × amps.

Q3: Should I size for peak or average load?
A: Size for peak load (all devices running simultaneously at maximum capacity).

Q4: What about fuel efficiency?
A: Generators run most efficiently at 50-80% load. Oversizing too much reduces efficiency.

Q5: Can I add more devices later?
A: It's better to size for future needs than to overload your generator later.