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30 April 2025..:: UPS / Inverter » UPS Sizing::..Register  Login
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With an emergency backup power system you can be prepared for a power outage and enjoy real peace of mind! Use our "Home Wattage Calculator" to determine what size backup power system is ideal for your home and family.How Much Power Do You Need?
  Appliance Rated Watts Start-up Watts
  Survival Appliances    
Enter # of light bulbs 75 each 75 each
Refrigerator/Freezer 500 2000
Electric Blanket 400 400
Space Heater 1800 1800
  Cooling    
Dehumidifier 650 800
Attic Fan* 300 900
Table Fan 800 2000
Window Air Conditioner 1200 4800
Central Air (10kBTU)* 1500 6000
Central Air (24kBTU)* 3800 15000
Central Air (40kBTU)* 6000 24000
  Family Room    
Computer 300 300
CD Player 100 100
VCR 100 100
Radio 100 100
Television 300 300
Receiver 420 420
  Kitchen    
Microwave 800 800
Blender 300 900
Coffee Maker 1500 1500
Electric Kettle 2400 2400
Toaster (2-slice) 1000 1600
Dishwasher (Hot-Dry) 1500 3000
Electric Frying Pan 1800 1800
Electric Oven 3410 3410
  Laundry Room    
Iron 1200 1200
Washing Machine 1150 3400
Electric Clothes Dryer 5400 6750
  Other Important Items    
Security System 500 500
Deep Freezer 500 1000
Hair Dryer 1200 1200
Garage Door Opener(1/3 HP) 250 250
Electric Gate Motor(1/2 HP) 350 350
Electric Water Heater 4000 4000
 


Disclaimer: This wattage selection guide should be considered an estimating tool only. Most systems can run these items intermittently. Check the power demands of your appliances to determine whether they can be run simultaneously.

UPS Size Calculation
Please enter the needed values in the fields below in order to correctly calculate the amount of batteries your UPS will need.
Hours
Voltage
Battery AH


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