How many watts does a desktop computer use?
Updated
Running watts
150 W
Starting watts
150 W
Energy per day
900 Wh
A desktop computer typically draws about 150 watts while running. At about 6 h of use a day, that is roughly 900 Wh per day. These are typical values from generator wattage charts: the label on your own appliance (or its EnergyGuide sticker) gives the exact figure.
What size generator do I need for a desktop computer?
Plan for at least 180 W: 150 W to get through the start-up surge, plus a 20% margin so the generator never runs flat out. Of the common sizes, a 2,000 W generator is the smallest that fits.
| Generator | Can it run a desktop computer? |
|---|---|
| 2,000 W | Yes |
| 3,500 W | Yes |
| 5,000 W | Yes |
| 7,500 W | Yes |
| 10,000 W | Yes |
| 15,000 W | Yes |
How long will a power station run a desktop computer?
Running continuously at 150 W, assuming 85% of the battery is usable. The station's AC output must also handle the 150 W start-up surge.
| Battery capacity | Runtime |
|---|---|
| 1,000 Wh | about 6 h |
| 2,000 Wh | about 11 h |
| 3,600 Wh | about 20 h |
Running more than one appliance?
Starting surges don't add up the way running watts do. Pick everything you want to power to get your real number.
Open the Generator Size Calculator for Your HomeFrequently asked questions
What size generator do I need to run a desktop computer?
At least 180 W: 150 W to cover the start-up surge, plus a 20% safety margin.
Can a 2,000 watt generator run a desktop computer?
Yes. 2,000 W covers its 150 W starting surge with room to spare.
Can a 3,500 watt generator run a desktop computer?
Yes. 3,500 W covers its 150 W starting surge with room to spare.
How long will a 1,000 Wh power station run a desktop computer?
About 6 h, assuming 85% usable capacity, as long as the station's AC output is rated for 150 W of surge.
Never run a generator indoors or in a garage: see the CPSC safety guide.