Watts Calculation:
From: | To: |
The Watts calculation for home backup determines the total power requirements needed for backup power systems. It accounts for both the continuous power draw (appliance watts) and the temporary surge power needed when appliances start up.
The calculator uses the following equation:
Where:
Explanation: The equation calculates the total power capacity needed for a home backup system by adding the continuous power requirements to the startup surge requirements.
Details: Accurate wattage calculation is crucial for selecting properly sized backup power systems (generators, battery backups) to ensure all essential appliances can operate during power outages.
Tips: Enter the total appliance watts (sum of all appliances you want to run) and the largest starting surge value from your appliances. All values must be positive numbers.
Q1: What's the difference between running watts and starting watts?
A: Running watts is the continuous power needed to keep appliances operating, while starting watts is the extra power needed briefly when appliances first turn on.
Q2: How do I find my appliances' wattage?
A: Check appliance labels, manuals, or use a wattage meter. Some appliances list amps instead - multiply amps by voltage (usually 120V) to get watts.
Q3: What's a typical starting surge for common appliances?
A: Refrigerators may need 2-3x running watts to start, while air conditioners may need 3-4x running watts during startup.
Q4: Should I size my backup system for total watts?
A: Yes, your backup system must handle both the running watts and the largest starting surge in your system.
Q5: What if I have multiple appliances with starting surges?
A: You typically only need to account for the largest single starting surge, as appliances don't all start simultaneously.