1. What is a Whole House Generator Wattage Calculator?

Definition: This calculator estimates the wattage requirement for a whole house generator based on your total electrical load and a safety factor.

Purpose: It helps homeowners and electricians determine the appropriate generator size for backup power needs.

2. How Does the Calculator Work?

The calculator uses the formula:

Where:

• \( P_w \) — Required generator wattage (watts)
• \( \Sigma P_{load} \) — Total connected load wattage (watts)
• \( SF \) — Safety factor (typically 1.25 for residential)

Explanation: The total connected load is multiplied by a safety factor to account for startup surges and future expansion.

3. Importance of Proper Generator Sizing

Details: Correct generator sizing ensures reliable power during outages, prevents overload situations, and maximizes fuel efficiency.

4. Using the Calculator

Tips: Enter the total wattage of all connected loads and the safety factor (default 1.25). All values must be > 0.

5. Frequently Asked Questions (FAQ)

Q1: Why do we need a safety factor?
A: The safety factor accounts for motor startup surges (which can be 3-5x running wattage) and potential future electrical needs.

Q2: What's a typical safety factor?
A: Residential applications typically use 1.25, while commercial may use 1.5 depending on the load types.

Q3: How do I find my total load wattage?
A: Add up the wattage of all appliances and systems you want to power simultaneously, or consult an electrician for a load calculation.

Q4: Should I round up the generator size?
A: Yes, generators are typically sold in standard sizes (e.g., 5kW, 7.5kW, 10kW) - round up to the nearest available size.

Q5: Does this include HVAC systems?
A: Only if you included them in your total load calculation. HVAC systems often require significant startup power.