How many watts do home appliances use?

These are the appliances people most want running during an outage. Each one has its own page with the sources and battery runtimes.

The ranges are wide because sources measure different things. Generator charts list a generous running figure for sizing. ENERGY STAR test data shows the average draw over a day, which is what a battery has to supply.

Add yours up in the runtime calculator

Appliance wattage by source
Appliance	Running	Extra at startup	Average over a day	Voltage
Refrigerator	700 to 1,000 W	1,000 to 2,200 W	52 W	120 V
Freezer	500 to 700 W	2,200 W	50 W	120 V
CPAP machine	56 to 80 W	–	–	120 V
Space heater	1,500 W	–	–	120 V
Well pump	670 to 1,000 W	2,000 W	–	240 V
Sump pump	800 to 1,116 W	1,300 W	–	120 V
Window air conditioner	667 to 3,250 W	3,950 W	–	120 V
Central air conditioner	3,077 W	–	–	240 V
Wi-Fi router and modem	4 to 20 W	–	–	120 V
Furnace blower	100 to 700 W	1,400 W	–	120 V
Dehumidifier	488 to 700 W	–	–	120 V
TV	98 to 120 W	–	–	120 V