1. What is Generator Power Calculation?

The generator power calculation determines the appropriate size of a home generator by summing all electrical loads and applying a safety factor. This ensures the generator can handle all connected devices with some capacity to spare.

2. How Does the Calculator Work?

The calculator uses the generator power equation:

Where:

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

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

3. Importance of Proper Sizing

Details: Correct generator sizing prevents overload (which can damage the generator) and underutilization (which wastes money). A properly sized generator runs efficiently and lasts longer.

4. Using the Calculator

Tips:

1. Calculate or estimate your total electrical load in watts
2. Select an appropriate safety factor (1.35 is typical for homes)
3. The result shows the minimum generator size needed

5. Frequently Asked Questions (FAQ)

Q1: Why do I need a safety factor?
A: Electrical devices often have startup surges that exceed their running wattage. The safety factor ensures your generator can handle these temporary peaks.

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

Q3: What's the difference between running and starting watts?
A: Running watts are what a device uses continuously. Starting watts (higher) are needed briefly when motors start up. The calculator accounts for this with the safety factor.

Q4: Should I round up the generator size?
A: Yes, generators are typically sold in standard sizes (e.g., 5kW, 7.5kW, 10kW). Choose the next available size above your calculated need.

Q5: Can I use this for whole-house generators?
A: Yes, but for whole-house installations, consult an electrician to ensure proper load calculation and transfer switch installation.